Despite teleosts being the largest and most diverse group of vertebrates, fish models currently used to study photoperiodic effects on fish physiology have been limited to a few species, most of which are temperate seasonal breeders. The overall aim of this work was to expand our knowledge on circadian biology and environmental physiological effects in Nile tilapia (Oreochromis niloticus niloticus), a continuous breeding species of tropical-subtropical origin. The circadian light axis of Nile tilapia is described with regards to melatonin production. Circadian melatonin profiles of fish under 12L:12D photoperiods were observed to be low at day and high at night, suggesting melatonin to be an entraining signal as observed in all other vertebrates. When constant light (LL) was used, such day and night fluctuations where abolished. However when fish where exposed to constant darkness (DD) a strong robust endogenous melatonin rhythm was found, suggesting the presence of circadian oscillators in this ...
Secretory proteins in the skin mucus of Nile tilapia (Oreochromis niloticus) are modulated temporally by photoperiod and bacterial endotoxin ...
TY - JOUR. T1 - Changes in the quality of fishburger produced from Tilapia ( Oreochromis niloticus ) during frozen storage (-18 degrees C). AU - Tokur, B.. AU - Polat, A.. AU - Beklevik, G.. AU - Ozkutuk, S.. PY - 2004. Y1 - 2004. N2 - In this study, the chemical and sensory qualities of fishburger produced from tilapia (Oreochromis niloticus) were investigated during frozen storage (-18 degreesC) over 8 months. The ratios of crude protein, lipid, moisture, crude ash, and polyunsaturated fatty acids in tilapiaburger were found to be 17.82%, 5.29%, 66.68%, 2.56% and 7.95% respectively. At the end of the study, the total volatile basic nitrogen value was found to have fluctuated throughout the storage periods. The highest thiobarbituric acid value was found at the 7th month as 0.142 mg malonaldehyde/kg. The peroxide value was 0.18 meq/kg at the beginning of the storage but increased to 5.03 meq/kg at 6th month of storage and then decreased to 0.82 meq/kg at the 8th month. The level of free fatty ...
TY - JOUR. T1 - A compendium of developmental gene expression in Lake Malawi cichlid fishes. AU - Bloomquist, R. F.. AU - Fowler, T. E.. AU - Sylvester, J. B.. AU - Miro, R. J.. AU - Streelman, J. T.. PY - 2017/2/3. Y1 - 2017/2/3. N2 - Background: Lake Malawi cichlids represent one of a growing number of vertebrate models used to uncover the genetic and developmental basis of trait diversity. Rapid evolutionary radiation has resulted in species that share similar genomes but differ markedly in phenotypes including brains and behavior, nuptial coloration and the craniofacial skeleton. Research has begun to identify the genes, as well as the molecular and developmental pathways that underlie trait divergence. Results: We assemble a compendium of gene expression for Lake Malawi cichlids, across pharyngula (the phylotypic stage) and larval stages of development, encompassing hundreds of gene transcripts. We chart patterns of expression in Bone morphogenetic protein (BMP), Fibroblast growth factor ...
Abstract Traditionally, fish oil (FO) has been used extensively in aquafeeds. The stagnation in global fish oil production coupled with an increased demand for its use in aquaculture feeds, especially salmonid feeds, has greatly inflated fish oil prices. Therefore, in order to sustain the rapid growth of the tilapia industry, the dependence on these commodities in feeds should be reduced through use of cheaper and more sustainable sources of dietary lipids, such as palm oil. This study therefore investigated several, previously poorly understood, effects of palm oil on reproductive performance of the commercial tilapia species, Oreochromis niloticus; which currently ranks as second most popular species in world aquaculture. In the present study broodstock were fed on experimental diets at full and half ration regimes throughout their entire life cycle from exogenous feeding. Studies were conducted in standardised and controlled hatchery conditions, thereby reducing the potential influence of ...
Pseudomonas aeruginosa (P. aeruginosa) produces a suite of virulence factors that are coordinated by Quorum Sensing (QS) contributing to its disease-causing ability in aquaculture. The present study is first of its kind to obtain information regarding the presence and distribution of five QS genes, three virulence genes viz: lasI, lasR, rhlI, rhlR, rhlAB, toxA, aprA and plcH and seven of the Extended-spectrum βlactamases (blaVEB, blaPER, blaTEM,, blaSHV, blaCTX-M1, blaCTX-M2 and blaCTX-M3) of Pseudomonas species isolated from fish meat by direct PCR. Bacterial identification was based mainly on conventional biochemical techniques using the Vitek 2, automated system. Phenotypic sensitivity of antibiotics was established by the agar disc diffusion technique through 16 various antimicrobial drugs. Quantification of their in vitro production of numerous virulence genes outside the cell that are QS dependent namely, pyocyanin, elastase, alkaline protease, biofilm and cytotoxicity of Vero cell was as
Sex chromosomes change more frequently in fish than in mammals or birds. However, certain chromosomes or genes are repeatedly used as sex determinants in different members of the teleostean lineage. East African cichlids are an enigmatic model system in evolutionary biology representing some of the most diverse extant vertebrate adaptive radiations. How sex is determined and if different sex-determining mechanisms contribute to speciation is unknown for almost all of the over 1,500 cichlid species of the Great Lakes. Here, we investigated the genetic basis of sex determination in a cichlid from Lake Tanganyika, Astatotilapia burtoni, a member of the most species-rich cichlid lineage, the haplochromines. We used RAD-sequencing of crosses for two populations of A. burtoni, a lab strain and fish caught at the south of Lake Tanganyika. Using association mapping and comparative genomics, we confirmed male heterogamety in A. burtoni and identified different sex chromosomes (LG5 and LG18) in the two
article{9cc27631-773b-4625-add5-aeb353c7d0cb, abstract = {,p,Parasite diversity and abundance (parasite load) vary greatly among host species. However, the influence of host traits on variation in parasitism remains poorly understood. Comparative studies of parasite load have largely examined measures of parasite species richness and are predominantly based on records obtained from published data. Consequently, little is known about the relationships between host traits and other aspects of parasite load, such as parasite abundance, prevalence and aggregation. Meanwhile, understanding of parasite species richness may be clouded by limitations associated with data collation from multiple independent sources. We conducted a field study of Lake Tanganyika cichlid fishes and their helminth parasites. Using a Bayesian phylogenetic comparative framework, we tested evolutionary associations between five key host traits (body size, gut length, diet breadth, habitat complexity and number of sympatric ...
Cichlids are a diverse group of fish from the family Cichlidae. There are an estimated 1300 to 3000 species of cichlids. They come in a variety of shapes and sizes, ranging from 2.5 cm to 1 meter in length and can live for 4-10 years. Cichlids originated in Africa but can be found in South America as well; most notably, they are found in Lake Malawi, Lake Tanganyika and Lake Victoria. In Lake Malawi alone, there are an estimated 1,000 different types of cichlid species (Evolutionary Biology). They prefer fresh to brackish water and usually live near the waters surface. Many cichlids are herbivores that feed on algae, but some are predatory and consume other small fish or insect larvaes.. Why study Cichlids? Cichlids are great model organisms to study because they represent rapid and convergent evolutionary radiation in vertebrates. Also, there is a large variety of cichlids which makes it easier for scientists to study multiple phenotypic traits.. Cichlid Reproduction. Cichlids demonstrate four ...
The hundreds of endemic species of cichlid fishes in the East African Great Lakes Tanganyika, Malawi, and Victoria are a prime model system in evolutionary biology. With five genomes currently being sequenced, eastern African cichlids also represent a forthcoming genomic model for evolutionary studies of genotype-to-phenotype processes in adaptive radiations. Here we report the functional annotation and comparative analyses of transcriptome data sets for two eastern African cichlid species, Astatotilapia burtoni and Ophthalmotilapia ventralis, representatives of the modern haplochromines and ectodines, respectively. Nearly 647,000 expressed sequence tags were assembled in more than 46,000 contigs for each species using the 454 sequencing technology, largely expanding the current sequence data set publicly available for these cichlids. Total predicted coverage of their proteome diversity is approximately 50% for both species. Comparative qualitative and quantitative analyses show very similar ...
Our research program uses fishes, and specifically the African cichlid fish Astatotilapia burtoni (see Model System page), as models to study how the brain processes information, how sensory systems contribute to behavior, and how natural plasticity in an animals internal hormonal or nutritional state can influence neural function and behavioral outcomes. Fishes are the largest and most diverse group of vertebrates, which provides us with ideal organisms to study basic neuron and sensory function, and how it relates to proximate and ultimate behavioral mechanisms in comparative and evolutionary contexts. ...
Synonyms for Convict cichlid in Free Thesaurus. Antonyms for Convict cichlid. 3 synonyms for convict fish: convictfish, Oxylebius pictus, painted greenling. What are synonyms for Convict cichlid?
B chromosomes have a functional effect on sex determination in a species of cichlid fishes from Lake Victoria [...] The researchers found sex-ratio distortions caused by B chromosomes in the breeding line of the cichlids, as well as several protein-coding genes in the B chromosomes. The resultant ratio was female biased, suggesting a role for B chromosomes in female sex determination. [...] In the present study, the researchers performed an extensive analysis of B chromosomes in cichlid fishes from Lake Victoria to investigate their effect on cichlid evolution. Karyotype analysis of Lake Victoria cichlids suggested that, in one species, Lithochromis rubripinnis, there are female-specific B chromosomes. Crossbreeding experiments suggested that an effector of female sex determination in this species was the B chromosome. Furthermore, analyses of large-scale sequences of B chromosomes in Lake Victoria cichlids revealed multiple protein-coding genes in B chromosomes. The sex determination gene was ...
African Cichlids - Mbuna, Haps and Peacock Cichlids from African rift lakes, Lake Malawi, Victoria and Tanganyika. Hardy fish for specialty aquariums.
Cheers, Neale.,. Tank Mates?? Oscar comp./sys., Neotrop. cichlids period 08/28/08 Hello there, I have emailed you guys before about some of my tanks and ideas about new tanks and have received great advice! Now i have a question about my tiger Oscar cichlid who is about 8 inches long and pretty docile. I am soon moving him to a larger tank hopefully 75 gallons but maybe 55. And i was wondering about some tank mates for him. ,Not in the 55... too small, I am very interested in more South American cichlids. I have a particular interest in maybe getting a jack Dempsey? But i do know Jacks are pretty aggressive and territorial thats why i am consulting you guys. Another cichlid i was considering was a green terror but im not sure if the adult size of one could or would grow up to being as big as my Oscar because i have read that they only grow to be 8 inches in length. Lastly i was considering a blue Acara or a jaguar cichlid but my problem with these two are i have no idea how big they get. Could ...
Jewel Cichlid Acting Strange 1/2/07 Hi- I have a 55 gallon tank with 1 Kenyi cichlid, 1 Bumblebee cichlid, 1 hybrid cichlid, 1 orange cichlid (?), 1 red tip shark, 1 Pleco and a jewel cichlid. The jewel cichlid (which is a pearl color with blue dots) has been acting strange lately. She does not swim around only stays at the top of the tank. Her fins are all down and she curves her tailfin. She eats a little but not like she use to. She does not swim around although she has always kept to herself but now she is not acting normal. I have isolated her in a tank but I am at a loss as to what to do for her. Any advice would be appreciated. Thanks! Leslie , Clamped fins are a sign of a disease. Treat with Rid-Ich and salt for now. Crank the temp up to 82 F. If not better in three days then do a 50% water change and treat with Nitrofuranace and salt.-Chuck, Bumps on FW Fish - 1/22/07 A quick note for todays post Bumps on FW Fish in which Chuck suggested treating the fish with Nitrofurazone. The ...
Fish guide for Angelfish, Pterophyllum scalare, Freshwater Angelfish facts with fish pictures, description and information, types of freshwater angelfish, Silver Angelfish care, aquarium habitat and fish diseases, Angelfish tank mates, compatibility and breeding
Fish guide for Sardine Cichlid, Cyprichromis leptosoma profile with fish pictures, description and information, Slender Cichlid care, diet, habitat and fish diseases, tank mates, Slender Cichlid breeding, compatibility and keeping the Xenotilapia sp. Blue Flash cichlid aquarium, Slender Cyp, Neonback, Lepto Cichlid
Detail záznamu - Phylogeny of the Neotropical cichlid fish tribe Cichlasomatini (Teleostei: Cichlidae) based on morphological and molecular data, with the description of a new genus - Detail záznamu - Knihovna Akademie věd České republiky
Fish guide for Sexfasciatus, Neolamprologus sexfasciatus profile with fish pictures, description and information, Gold Sexfasciatus Cichlid care, diet, habitat and fish diseases, Sexfasciatus cichlid breeding, tank mates, compatibility and keeping the Sexfasciatus aquarium, Six-bar Lamprologus, Six Bar Cichlid
Sulfamethazine (SMZ) is one of the most commonly used sulfonamide compounds in fish farming, and its physiological effects on fish are unknown. SMZ was administered to juvenile Nile tilapia (Oreochromis niloticus) at a dose level of 422 mg kg⁻¹ body weight, for a period of 11 days, via medicated feed. Fish were divided into two groups, the control group (CG) and the group fed with SMZ in feed. The ...
Tilapia Oreochromis niloticus is an aquaculture resource that represents one of the most popular crops in the world. However, species cultivation presents health proble..
Fish guide for White-Tailed Brichardi, Neolamprologus gracilis profile with fish pictures, description and information, Gracilis Cichlid care, diet, habitat and fish diseases, Neolamprologus gracilis breeding, tank mates, compatibility and keeping the Graceful Lamprologus aquarium, Blue-tail Brichardi
Oreochromis niloticus DMO protein: DMO - DM-domain gene in ovary; isolated from the fish Tilapia, Oreochromis niloticus; amino acid sequence in first source; GenBank AF203490
Heritability estimates were determined for six phenotypes in Oreochromis niloticus for 180, 210 and 300 days old: body weight (BW), total length (TL), standard length (SL), body height (BH), caudal tail height (CTH) and head length (HL). Heritability estimates were calculated by half-sib analysis from an experiment that contained 3 paternal half-sib families and 11 full-sib families. Heritabilities ranged from 0.00-0.88. These results suggest that because heritabilities of BW, TL, SL, BH, CTH and HL for sires in Oreochromis niloticus for 180 and 210 days old are low, family selection or progeny testing can proposed for selection. But, therefore heritabilities of all traits both male and female for 300 days old are high, selection will propose for are mass selection.. ...
The ram cichlid, Mikrogeophagus ramirezi, is a species of freshwater fish endemic to the Orinoco River basin, in the savannahs of Venezuela and Colombia in South America. The species has been examined in studies on fish behaviour and is a popular aquarium fish, traded under a variety of common names, including ram, blue ram, German blue ram, Asian ram, butterfly cichlid, Ramirezs dwarf cichlid, dwarf butterfly cichlid and Ramirezi. The species is a member of the family Cichlidae and subfamily Geophaginae. Wild ram cichlids are often more colorful than the tank-bred fish, which suffer from poor breeding and also being injected with hormones for more color, although this makes as many as one in four males infertile.[citation needed] Male specimens of the ram usually have the first few rays of the dorsal fin extended, but breeding has made some females also show this. When close to spawning, female rams have a pink or red blush on the abdomen. Females also have a blue sheen over the spot just ...
Utahs premier Freshwater African Cichlid breeder with several species of African cichlids for sale. Call 801-572-2009 to buy your Malawi Cichlids at Live Fish Direct
Utahs premier Freshwater African Cichlid breeder with several species of African cichlids for sale. Call 801-572-2009 to buy your Malawi Cichlids at Live Fish Direct
Many shell-dwelling species are adaptations of these cave spawners and include Neolamprologus ocellatus. Their caves are made up of the empty, calcified shells of Neothauma snails which are preserved by the hard alkaline water. Shell dwellers can be kept in small tanks and make fascinating residents.. Mouthbrooders. These are also very popular with hobbyists, with the rock dwelling, algae grazing Tropheus, the large sedate, predatory Frontosa and the slender, open water Sardine cichlids making up the bulk of all such fish sold. The three are very different in their requirements, despite inhabiting the same lake, so should not be kept together in the same tank.. Tropheus look and behave like Pseudotropheus from Lake Malawi. Their diet is poor, consisting of short algae strands growing from rocks and the odd invertebrate found within the algae. This growth is commonly referred to as aufwuch. Tropheus are aggressive and territorial in the aquarium, as in nature they fight to protect their algae and ...
Population boundaries are largely determined by local environment, the strength of barriers to migration, and the organisms inherent dispersal abilities. The interaction among these and genetic factors determines the potential for evolutionary divergence, and is at the heart of our understanding of ecological adaptation and ongoing speciation processes. When individuals can easily cross barriers between suitable habitat patches, gene flow acts to homogenize most neutral genetic diversity and may swamp the effects of any local phenotypic selection whereas low levels of migration may facilitate ecological divergence, even when selection is modest. Evolutionary divergence through fine-scale geographic isolation is believed to be one of the main mechanisms promoting speciation in the cichlid radiations of the African Great Lakes [1-3]. Many lake species are extreme local endemics, with distributions limited to small patches of ecologically distinct habitat. Many narrowly endemic cichlid species are ...
Background Cichlid fishes have radiated into hundreds of species in the Great Lakes of Africa. Brightly colored males display on leks and vie to be chosen by females as mates. Strong discrimination by females causes differential male mating success, rapid evolution of male color patterns and, possibly, speciation. In addition to differences in color pattern, Lake Malawi cichlids also show some of the largest known shifts in visual sensitivity among closely related species. These shifts result from modulated expression of seven cone opsin genes. However, the mechanisms for this modulated expression are unknown. Results In this work, we ask whether these differences might result from changes in developmental patterning of cone opsin genes. To test this, we compared the developmental pattern of cone opsin gene expression of the Nile tilapia, Oreochromis niloticus, with that of several cichlid species from Lake Malawi. In tilapia, quantitative polymerase chain reaction showed that opsin gene ...
The proportion of assembled haplochromine cichlid sequences with and without BLAST matches compared to three databases (Takifugu rubripes, Danio rerio, and Onco
The firemouth cichlid (Thorichthys meeki) is a species of cichlid fish native to Central America. They occur in rivers of the Yucatán Peninsula, Mexico, south through Belize and into northern Guatemala. Their natural habitat is typically shallow, slow-moving, often turbid, water with a pH of 6.5 - 8.0. It has also been reported to live in underground cave systems. As fish with a tropical distribution, firemouth cichlids live in warm water with a temperature range of 23-30 °C (75-86 °F). The common name, firemouth, is derived from the bright orange-red colouration on the underside of the jaw. Males in particular flare out their gills, exposing their red throats, in a threat display designed to ward off male rivals from their territory. Like most cichlids, brood care is highly developed; this species is an egg-layer. Firemouth cichlids form monogamous pairs and spawn on flattened surfaces of rocks, leaves or submerged wood. Breeding males are primarily responsible for territorial defense, while ...
Neotropical Cichlid Phylogeny - Tropical fish forum at the Age of Aquariums - dedicated to promoting responsible fish-keeping internationally.
Convict Cichlids is a kind of fish also known as Zebra Cichlids to aquarium enthusiasts. They are relatively easy to breed because they require minimal human supervision or intervention.
We examined the metabolic and ionoregulatory responses of the Amazonian cichlid, Astronotus ocellatus, to 20 h exposure to severe hypoxia (0.37 +/- 0.19 mg O(2)/l; 4.6% air saturation) or 8 h severe hypoxia followed by 12 h recovery in normoxic water. During 20 h exposure to hypoxia, white muscle [A …
Wardley Wardley Cichlid Medium Floating Pellet Food Cichlid Food Wardley Premium Cichlid Floating Pellets (Medium) provide a balanced diet for growth, superior coloration and survival of both herbivorous and carnivorous cichlids. Provides a balanced diet for growth Promtes superior colora...
In this study, we wanted to take the first step in understanding vision in cichlids and to know whether they have true color vision. Further studies are needed to dissect the cichlid visual system as well as its adaptations and limitations but, given our visual modeling and behavioral results, we can infer the physiological characteristics of the cichlid retina. Initially, based on previous fish-vision studies applying the RNL model, we assumed a Weber fraction of 0.05 (Champ et al., 2016; Cheney et al., 2009; Dalton et al., 2016; Wilkins et al., 2016) for the LWS channel. However, in order to better predict cichlid performance, we adjusted this to a higher Weber fraction of 0.1. We did this because, even though we are not evaluating color discrimination thresholds, increasing the Weber fraction, and hence lowering chromatic distance, would partially explain the mistakes fish made (Figs 2 and 3). In general, a Weber fraction of 0.05 is accepted for most animals (Vorobyev and Osorio, 1998) but it ...
Although it is widely assumed that the evolution of jaw kinesis in the ray-finned fishes was an innovation to enhance suction feeding performance, the lack of phylogenetic replication of this event across fishes has hindered direct tests of this hypothesis. Our results reveal that within the East African cichlid radiations, multiple transitions between biting and suction feeding have occurred, and that these functional transitions are accompanied by evolutionary reduction of jaw kinesis over short evolutionary timescales of 4 Myr or less (figure 3). These rapid and repeated shifts are consistent with the hypothesis that high jaw kinesis is selectively maintained in suction feeding fishes and provides evidence supporting upper jaw protrusion as a major evolutionary innovation for ray-finned fishes.. Our power to detect associations between jaw kinesis and transitions in feeding mode is directly connected to the sheer number of dietary transitions that have occurred in these cichlid radiations, ...
Among multigene families, ribosomal RNA (rRNA) genes are the most frequently studied and have been explored as cytogenetic markers to study the evolutionary history of karyotypes among animals and plants. In this report, we applied cytogenetic and genomic methods to investigate the organization of rRNA genes among cichlid fishes. Cichlids are a group of fishes that are of increasing scientific interest due to their rapid and convergent adaptive radiation, which has led to extensive ecological diversity. The present paper reports the cytogenetic mapping of the 5S rRNA genes from 18 South American, 22 African and one Asian species and the 18S rRNA genes from 3 African species. The data obtained were comparatively analyzed with previously published information related to the mapping of rRNA genes in cichlids. The number of 5S rRNA clusters per diploid genome ranged from 2 to 15, with the most common pattern being the presence of 2 chromosomes bearing a 5S rDNA cluster. Regarding 18S rDNA mapping, the
The Yellowfin Borleyi Cichlid, also known as Haplochromis barlowi, originates from the Southern part of Lake Malawi, Africa. The males have a blue body with striking yellow fins, and are one of the larger Copadichromis Cichlids reaching a maximum size of 7. When mature, the females remain brown to silver in color, and will be slightly smaller than the males. A large aquarium with plenty of caves and hiding places is ideal for the Yellowfin Borleyi Cichlid. Caves can be formed from limestone or any other type of inert rock, as well as African Driftwood. An aragonite-based substrate is recommended in order to maintain the necessary high pH and alkalinity. They do not like bright lighting, and the aragonite should ideally be either mixed with or covered by darker gravel to reduce the amount of glare in the aquarium. The Yellowfin Borleyi Cichlid requires a substrate deep enough to burrow in during breeding time. For best results in spawning, the males should be kept with at least three females. ...
Swim-up fry (average weight, 14 mg) were obtained from Oreochromis niloticus (Chitralada strain) held in concrete tanks. In experiment 1 (1985), fry were fed diets treated with 17 alpha-methyltestosterone (MT) or progesterone at 60 mg/kg for 40 days. Control fish were fed untreated diet. Fingerlings (average weight, 2.86 g) were subsequently stocked at 1/square m. in earthen ponds receiving septic tank slurry at 150 kg COD/ha/day and fine rice bran as supplementary feed for about 5 months. In experiment 2 (1986), similar procedures were followed but the fry were fed MT at 40 mg/kg for 40 days and pond stocking rates of 1,3,5 and 7 fingerlings/sq. m were compared. Individual size, sex and stage of maturity were determined. In experiment 1, the average individual size was greatest in the MT-treated group (263 g), compared with the untreated (232 g) and progesterone-treated fish (189 g). The final size of fish in experiment 2 decreased significantly (P0.05) with density, from an average of 249 g at ...
cichlids Wallpaper, wallpaper of african cichlids in an aquarium fresh water with plants and drift wook with some tetras inside too, there is also some sand, very natural looking and setting. download cichlids wallpaper for your mobile device like iphone or ipad or cell phone like a smart phone like samgung and motorolla in high definition in all sizes for free, no virus, no spam, no spyware and no malware. Share cichlids wallpaper in facebook, twitter, myspace, tumbler
And flourish it did in the Rift Valley lakes. If you were to visit these lakes, snorkel or scuba in their waters, you would most likely notice a wide variety of fish. You would not be wrong in this assessment; however, you might be surprised to find that most of these types of fish are belonging to a group called the cichlids (SICK-lids), and that all 1,650 plus species of these cichlids descended from a common ancestor. While the dates of when the common ancestor of the various cichlids came to be trapped in their respective lakes, it has been estimated that the cichlids of Lake Malawi all evolved from a common ancestor trapped 700,000 years ago, and those of Lake Victoria around 12,000 years ago. Trapped in these growing lakes while they were being formed, this small group of fish quickly came to dominate their new home, exploding in biodiversity to adapt to the wide variety of niches left open to them ...
in the mid to late 1980s. Its parentage has been highly disputed, but the most commonly speculated pairings are Midas Cichlid (Amphilophus Citrinellus) with the Redhead Cichlid (Paratheraps Synspilum). One of the more wild theories is the Severum (Heros Severus) with the Red Devil Cichlid (Amphilophus Labiatus). Blood Parrots have a round body, a beak shaped head with an upside down triangle mouth. They are often seen in bright orange in coloration, but seen in other colors such as red, yellow, brown, and tan. A further developed variety is the Convict Parrot Cichlid, which is also called the Jellybean Parrot or Bubble Gum Parrot. This is actually a double hybrid fish. It is a cross between a female hybrid Blood Parrot and a pink male Convict Cichlid Archocentrus (Cichlasoma) nigrofasciatus. Blood Parrots have reportedly been crossed with other cichlid species such as the Severum and the Texas Cichlid. So there may be other new varieties showing up down the road ...
Sensory adaptation to the local environment can contribute to speciation. Aquatic environments are well suited for studying this process: The natural attenuation of light through water results in heterogeneous light environments, to which vision-dependent species must adapt for communication and survival. Here, we study visual adaptation in sympatric Pundamilia cichlids from southeastern Lake Victoria. Species with blue or red male nuptial coloration co-occur at many rocky islands but tend to be depth-differentiated, entailing different visual habitats, more strongly at some islands than others. Divergent visual adaptation to these environments has been implicated as a major factor in the divergence of P. pundamilia and P. nyererei, as they show consistent differentiation in the long-wavelength-sensitive visual pigment gene sequence (LWS opsin). In addition to sequence variation, variation in the opsin gene expression levels may contribute to visual adaptation. We characterized opsin gene ...
Gante, Hugo F; Matschiner, Michael; Malmstrøm, Martin; Jakobsen, Kjetill Sigurd; Jentoft, Sissel & Salzburger, Walter (2016). Genomics of speciation and introgression in Princess cichlid fishes from Lake Tanganyika. Molecular Ecology. ISSN 0962-1083. 25(24), s 6143- 6161 . doi: 10.1111/mec.13767 Show summary How variation in the genome translates into biological diversity and new species originate has endured as the mystery of mysteries in evolutionary biology. African cichlid fishes are prime model systems to address speciation-related questions for their remarkable taxonomic and phenotypic diversity, and the possible role of gene flow in this process. Here, we capitalize on genome sequencing and phylogenomic analyses to address the relative impacts of incomplete lineage sorting, introgression and hybrid speciation in the Neolamprologus savoryi-complex (the Princess cichlids) from Lake Tanganyika. We present a time-calibrated species tree based on whole-genome sequences and provide strong ...
The Nile tilapia, Oreochromis niloticus, is a tropical fish species of commercial importance in both aquaculture and in the wild. It plays a great role in human nutrition and food security. River Ruiru is one of the rivers faced with pollution from nearby industries. It is inhabited by various species of fish such as tilapia and common carp, which, may be harvested by surrounding communities for food. High levels of heavy metals disrupt normal reproductive process in fish. Besides, it has been reported that edible fish contaminated with heavy metals has deleterious effects on the health of humans and other animals that consume them. There is no documented information on the association between heavy metals and the reproductive biology of Oreochromis niloticus in River Ruiru. This study was aimed at assessing the level of heavy metals in fish ovaries and their association with selected reproductive parameters in the reproductive cycle of O. niloticus. Fish samples were collected monthly, for 8 ...
This study aimed to evaluate the efficacy of three methods of slaughter of Nile tilapia (Oreochromis niloticus) and the quality of frozen fillets. This research was performed in two steps consisting in applying the methods of killing by electric shock (ChE), gas mixture (CO2N) and hypothermia (AG). The first step was analyzed whole fish cold, evaluated indices of rigor mortis, degradation of ATP, pH, N-BVT NNP, muscle contraction, and texture instrumental color and sensory evaluation. Fish killed by ChE showed a delay in the time of entry into rigor mortis, this same treatment showed R2 0.92 in the interaction between the degradation of ATP and rigor. The pH was affected (p, 0.05) by treatments and time. The highest values occurred in the BNV slaughter by ChE. Slaughter presented by AG 452 mg NNP/100g. The storage time caused a slight decrease in instrumental texture slaughter by ChE. A L* increased with time for slaughter for ChE and CO2N. Sensory analysis showed an R2 0.94, 0.98 and 0.96 for ...
Paper:Potentiality of Moringa oleifera aqueous extract as a growth modulator and antistress in acute hypoxic Nile tilapia Oreochromis niloticus , Author:Shourbela R.M.1; El-Hawarry W.N.1*; Abd El-Latif A.M.2; Abo-Kora S.Y.3 , Year:2020 , Faculty of Veterinary Medicine ,Department of Fish Diseases and mangement ,Benha University
The bacteriological quality of both wild and cultured Nile Tilapia, Oreochromis niloticus, sourced in some area of Ibadan, Southwest, Nigeria was studied. Bacteria flora of the skin and stomach of fish samples were examined and compared statistically (t-test independent). The resistance of bacterial isolates to commonly used antibiotics was also studied. Total aerobic bacteria count [colony forming unit: CFU = 159.50.13 ± 72, t < 0.01] with significant difference in the skin and Enterobacteriaceae count [(CFU) = 74.08 ± 5.55] with significant difference in the stomach were obtained in the Nile tilapia. The bacteria in the genera Staphylococcus, Escherichia, Proteus, Bacillus, Klebsiella, Micrococcus, Serratia, Pseudomonas, Salmonella and Streptococcus were isolated and have been proven to be of great public health significance. About 87.5% of the tested isolates were resistant to augmentin, 83.33% to cotrimoxazole and nalidixic acid. In addition, 79.17% of the isolates were resistant to tetracycline,
Oreochromis amphimelas, Oreochromis andersonii, Oreochromis angolensis, Oreochromis aureus, Oreochromis chungruruensis, Oreochromis esculentus, Oreochromis hunteri, Oreochromis ismailiaensis, Oreochromis jipe, Oreochromis karomo, Oreochromis karongae, Oreochromis korogwe, Oreochromis lepidurus, Oreochromis leucostictus, Oreochromis lidole, Oreochromis macrochir, Oreochromis malagarasi, Oreochromis mortimeri, Oreochromis mossambicus, Oreochromis mweruensis, Oreochromis niloticus, Oreochromis pangani, Oreochromis pangani girigan, Oreochromis pangani pangani, Oreochromis placidus, Oreochromis placidus placidus, Oreochromis placidus ruvumae, Oreochromis rukwaensis, Oreochromis saka, Oreochromis salinicola, Oreochromis schwebischi, Oreochromis shiranus, Oreochromis shiranus chilwae, Oreochromis shiranus shiranus, Oreochromis spilurus, Oreochromis spilurus niger, Oreochromis spilurus percivali, Oreochromis spilurus spilurus, Oreochromis squamipinnis, Oreochromis tanganicae, Oreochromis upembae, ...
The present study was carried out to isolate Edwardsiella tarda (E. tarda) from cultured Oreochromis niloticus (O. niloticus) and that identified by both Biochemical tests (API 20 E) and PCR. A total of 2 E. tarda isolates were isolated from 50 cultured O. niloticus fish collected randomly from the ponds of private fish farms at Kafr El Sheikh Governorate, Egypt. The clinical picture of the collected fish exhibited loss of escape reflex; skin darkness; bilateral exophthalmia with corneal opacity and ulcers varied in their degrees, inflammation, congestion, hemorrhage and enlargement of most internal organs were apparent in postmortem examination. The isolated E. tarda was screened for presence of 3 virulence genes (esrB, gyrB and gadB genes) using multiplex PCR and the results showed the amplification of the concerned gene at molecular size esrB (311 bp), gadB (583) in one strain and gyrB (415) in the other strain. Histopathological examination for haemobiotic organs liver, spleen and kidney as ...
TY - JOUR. T1 - Assessment of heavy metals in tilapia fish (Oreochromis niloticus) from the Langat River and Engineering Lake in Bangi, Malaysia, and evaluation of the health risk from tilapia consumption. AU - Taweel, Abdulali. AU - Shuhaimi-Othman, M.. AU - Abas Kutty, Ahmad. PY - 2013/7/1. Y1 - 2013/7/1. N2 - Concentrations of the heavy metals copper (Cu), cadmium (Cd), zinc (Zn), lead (Pb) and nickel (Ni) were determined in the liver, gills and muscles of tilapia fish from the Langat River and Engineering Lake, Bangi, Selangor, Malaysia. There were differences in the concentrations of the studied heavy metals between different organs and between sites. In the liver samples, Cu,Zn,Ni,Pb,Cd, and in the gills and muscle, Zn,Ni,Cu,Pb,Cd. Levels of Cu, Cd, Zn and Pb in the liver samples from Engineering Lake were higher than in those from the Langat River, whereas the Ni levels in the liver samples from the Langat River were greater than in those from Engineering Lake. Cd levels in the fish ...
Biological Treatment of Broad Bean Hulls and its Evaluation through Tilapia Fingerlings (Oreochromis Niloticus) Feeding Abstract.
The diversity of habitats occupied by cichlids is matched by the number of mating systems they employ. In fact, the local ecological conditions are an important indicator of the mating system used, which may vary within the same species. The most primitive condition is monogamy, with males and females essentially monomorphic, excepting some coloring details. Courtship rituals and parental care are common among monogamous pairs. Some cichlids are polygynous: males fertilize the eggs of more than one female. In this system, males might defend a territory that females visit to spawn (only once during the season), two females may defend a territory overlapping that of a male (bigamy), or a male may dominate a harem of multiple females. Cichlids also employ polyandry, in which females mate with several males. In one extraordinary case, sex roles are essentially reversed. Sarotherodon melanotheron males nurture eggs and fry in the mouth for 15 days after spawning, while females are capable of spawning ...
FERREIRA-SOBRINHO, Aristides e TAVARES-DIAS, Marcos. A study on monogenean parasites from the gills of some cichlids (Pisces: Cichlidae) from the Brazilian Amazon. Rev. Mex. Biodiv. [online]. 2016, vol.87, n.3, pp.1002-1009. ISSN 2007-8706. http://dx.doi.org/10.1016/j.rmb.2016.06.010.. The aim of this study was to investigate monogenean fauna in gills of Geophagus camopiensis, Pterophyllum scalare, Satanoperca jurupari, and Satanoperca acuticeps in a tributary from the Amazon River system in Brazil. A total of 2,148 monogenean specimens were collected from 140 fish examined from March 2012 to March 2013, and 84.3% of these fish were parasitized by 1 or more species. Such monogeneans were: Sciadicleithrum geophagi, Sciadicleithrum juruparii, Gussevia spiralocirra and Gyrodactylus sp. However, only G. camopiensis was parasitized by more than 1 species of monogenean, while S. jurupari and S. acuticeps were parasitized by the same species. Prevalence, mean intensity and mean abundance varied among ...
Live Aquatic Cichlids Find more 58 items of products in Cichlids ( Red Tiger Oscar Big, Snakeskin Discus 3, Venustus Cichlid and many other).
The Apistogramma cacatuoides is commonly known as the Cockatoo Dwarf Cichlid or Big Mouth Apistogramma. The Apistogramma originates in the streams and backwaters of South America. This strain has been selectively bred for its brilliant orange coloration. The body of these fish is elongated, with a prominent dorsal fin. The rear part of the dorsal fin, as well as the tail, has a striking orange coloration. The Dwarf Cockatoo Cichlid should be kept in an aquarium that is 30 gallons minimum, with densely planted groupings. They require plenty of open swimming areas but also need hiding places. A fine gravel to sand substrate is recommended. Although a semi-aggressive fish, the Apistogramma is also timid and should not be housed with large, aggressive fish. They require good water conditions, and regular water changes are a must. The Dwarf Cockatoo Cichlid is an egg layer that prefers to spawn in caves. Once the female has laid her eggs, the male will follow to fertilize them. After fertilization, ...
Formaldehyde (HCHO) was recently detected at concentrations above the cancer benchmark in 90% of 60 000 surveyed United States census tracks. Formaldehyde leaches into and mixes with water extremely well, exposing aquatic life. Further, formaldehyde is used therapeutically in aquaculture to remove external protozoa and other parasites from fish. The present study was undertaken to determine if sub-acute HCHO causes immunologic changes in tilapia Oreochromis niloticus. Fish were exposed to 0, 50, or 150 ppm of HCHO. Immune parameters examined included blood hematology, spleen/body weight ratio, spleen and pronephros total cellularity, leukocyte blastogenesis, and natural killer cell cytotoxicity. Organ/body weight ratios and total cellularity were not different from controls. Similarly, mitogen response and natural killer cell function were unchanged. Peripheral blood lymphocytes decreased as HCHO exposure increased. Formaldehyde exposure also decreased the number of progenitor cells in the fish ...
石橋 泰典 , 家戸 敬太郎 , 池田 静徳 , 村田 修 , 宮下 盛 , 熊井 英水 水産増殖 = The aquiculture 50(3), 347-353, 2002-09-20 日本農学文献記事索引 参考文献31件 ...
A new study has determined that social stress adversely affects digestive function in subordinate cichlid fish. Scientists compared bile retention and gall bladder size in dominant and subordinate males that had eaten equal amounts of food. They discovered not only were the gall bladders in the subordinate fish much larger, they were filled with dark
Sen, Sorphea, 2010. Effect of stocking density and fertilization on the growth performance of Tilapia (Oreochromis spp.) fed rice bran, water spinach and duckweed in pond and paddy field . Second cycle, A1E. Uppsala: SLU, Dept. of Animal Nutrition and Management ...
p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.,/p> ,p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.,/p> ,p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).,/p> ,p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x,sup>64,/sup> + x,sup>4,/sup> + x,sup>3,/sup> + x + 1. The algorithm is described in the ISO 3309 standard. ,/p> ,p class=publication>Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.,br /> ,strong>Cyclic redundancy and other checksums,/strong>,br /> ,a href=http://www.nrbook.com/b/bookcpdf.php>Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993),/a>),/p> Checksum:i ...
p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.,/p> ,p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.,/p> ,p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).,/p> ,p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x,sup>64,/sup> + x,sup>4,/sup> + x,sup>3,/sup> + x + 1. The algorithm is described in the ISO 3309 standard. ,/p> ,p class=publication>Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.,br /> ,strong>Cyclic redundancy and other checksums,/strong>,br /> ,a href=http://www.nrbook.com/b/bookcpdf.php>Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993),/a>),/p> Checksum:i ...
Arizona Aquatic Gardens offers the best in Central American Cichlids like these Nicaragua Cichlids. Shop online for savings today!
Reproduction of the fish Poeciliopsis gracilis (Cyprinodontiformes: Poeciliidae) in Coatetelco, a tropical shallow lake in Mexico. José Luis Gómez-Márquez; Peña-Mendoza, Bertha; Salgado-Ugarte, Isaías H.; Sánchez-Herrera, Abby K.; Sastré-Baez, Leonardo // Revista de BiologÃ-a Tropical;dic2008, Vol. 56 Issue 4, p1801 A reproductive analysis of 1 225 specimens of Poeciliopsis gracilis obtained through monthly samples from Coatetelco, a tropical shallow lake in Central Mexico, was made. There was an evident sexual dimorphism, including a difference in body size at the onset of reproduction. Sex ratio deviated... ...
a tropical fresh-water site covering all aspects of the hobby, from the fish to the aquariums. It contains sections for the novice and more advanced hobbyist alike, many tropical fish pictures are includedAfrican Cichlid Interbreeding
ORNAMARI.ALL keywords: fisornic.all, aquatic animals, snails, coral, anemones, shrimp, Abramites spp Headstanders; Acanthophthalmus spp Coolie loaches; Acanthopsis spp Long nosed loaches; Acarichthys heckelii; Acaronia nassa Big eyed cichlid; Aequidens spp Acaras; Alestes spp See Brycinus spp; Amblydoras spp Amblydoras; Anableps spp Four eyes; Ancistrus spp Bristle noses; Anoptichthys spp See Astyanax spp; Anostomus spp Headstanders; Aphanius fasciatus Banded minnow; Aphyocharax spp Bloodfin, flame-tail tetras; Aphyosemion spp Aphyosemions, killie fishes; Apistogramma spp Dwarf cichlids; Aplocheilichthys spp Lampeyes; Aplocheilus spp panchax; Apteronotus spp Black ghost; Arnoldichthys spp Characins; Aspidoras spp dwarf catfish; Astronotus ocellatus Marbled, yellow, back, red Oscar; Astyanax spp Astyanax, tetra; Aulonocara nyassae African peacock cichlid; Austrolfundulus spp killifish; Axelrodia spp Ruby tetra; Badis badis Dwarf chameleon fish; Balanteocheilus spp Silver, bala sharks; Barbodes ...
Bioaccumulation and purification of cadmium in Tubifex tubifex Łuszczek-Trojnar E. , Sroka K.1, Klaczak A. , Nowak M.1, Popek W. Abstract Full Text:PDF Recommended articles Mail to Author How to Cite Evaluation of Genotoxicity Induced by Medicinal Plant Jatropha gossypifolia in Freshwater Fish Channa punctatus (Bloch) Pratibha Singh , Anurag Dabas , Rashmi Srivastava , N.S. Nagpure , Ajay Singh Abstract Full Text:PDF Recommended articles Mail to Author How to Cite Bioaccumulation of Cadmium in Marine Diatom: Thalassiosira allenii Takano Göknur Şişman-Aydın , Baha Büyükışık , Rahime Oral Abstract Full Text:PDF Recommended articles Mail to Author How to Cite Determination of the Levels of Indicator Bacteria, Salmonella spp. and Heavy Metals in Sea Snails (Rapana venosa) from the Northern Marmara Sea, Turkey Gülşen Altuğ , Nihal Güler Abstract Full Text:PDF Recommended articles Mail to Author How to Cite Effect of Dietborne Cu and Cd on Body Indices of Nile Tilapia (Oreochromis ...
Abstain from Feeds with discus meal because discus fish does not easily digest them. Salt is the most misused and overused chemical in the discus fishroom. [STEP 2] - Perform water changes of 35% daily. Keep your discus away from any form of stress, as listed above. [STEP 5] - Use of Epsom salt for relaxation of the muscle of the fish. [STEP 4] - Feed Your Discus Anti-bacterial Fish Food. Keep in mind that once you add Epsom salt to the tank that it will stay until you do a water change. Epsom salt (magnesium sulfate) is a laxitive. NOTE: Epsom salt will increase the discus fish metabolic rate which will help them quickly get everything out of them, so you will normally see poops increment in your tank. Epsom salts do not go away once added to the tank and will stay in the water until you change it, so you dont need to replace it unless you do a water change. Description. You have 5 days from the first time he begins headstanding to cure him if you lower the water level, 3 days if you do not. ...
B.1. INTRODUCTION. The Nile perch (Lates niloticus),2 was reportedly transplanted into the Ugandan waters of Lake Victoria in the late 1950s and early 1960s (EAFFRO 1960; Hamblyn 1960).3 The question of whether or not to introduce this large, predatory fish sparked considerable controversy (Anderson 1961; Fryer 1960; Jackson 1971; Ogutu-Ohwayo 1985; Ribbink 1987; van Someren 1963). Opponents pointed out that such a step made little ecological sense: the theoretical potential sustained harvest from predatory fish (at the top of the food/energy pyramid) is significantly less than from their prey (typically represented at the middle or lower levels of the pyramid). Others argued that Nile perch, feeding on the huge but relatively unexploited and unpopular species stocks of haplochromine cichlids, would eventually provide the Lake with an important new fishery. Indeed, certain reports give the impression that Lates was first introduced with just such an objective in mind (e.g. Acere 1985). However, ...
The following is a compilation of references that I have accumulated over time. Most of them were forwarded to me by Fred Batzer. It is far from complete but someday, I hope to have a fairly comprehensive list of references from both scientific and hobby publications. Most of the items listed below are from European publications. If you have a few references that are missing from my list, please forward them to me. Crenicichla ...
Aquarium Care of Cichlids (Animal Planet Pet Care Library) Freshwater, Welcome to our friendly aquarium forum. We are happy to talk fish, answer your questions and help solve your problems. Join today. Its free!
Aquarium Care of Cichlids (Animal Planet Pet Care Library) Freshwater, Welcome to our friendly aquarium forum. We are happy to talk fish, answer your questions and help solve your problems. Join today. Its free!
silver sharks vs cichlids - im in kind of a dilema.....i have started a community tank with some silver sharks that are about 2 1/2 inches long. my friend recently purchased a...
TY - CHAP. T1 - Effect of dietary energy source (starch vs. fat) on energy utilization and oxygen consumption of Nile tilapia. AU - Schrama, J.W.. AU - Subramanian, S.. AU - Geurden, I.. AU - Coppens, K.. AU - Heinsbroek, L.T.N.. PY - 2010. Y1 - 2010. M3 - Abstract. SP - 224. BT - The 14th International Symposium on Fish Nutrition and Feeding: Program & Abstracts. May 31-June 4, 2010, Qingdao, China. CY - Qingdao, China. T2 - The 14th International Symposium on Fish Nutrition and Feeding. May 31-June 4, 2010, Qingdao, China. Y2 - 31 May 2010 through 4 June 2010. ER - ...
Citation: Wei Pridgeon, Y., Aksoy, M., Klesius, P.H., Li, Y., Mu, S., Srivastava, K., Reddy, G. 2011. Identification and expression profiles of multiple genes in Nile tilapia in response to bacterial infections. Veterinary Immunology and Immunopathology. 144:111-119. Interpretive Summary: To understand how Nile tilapia responds to bacterial infection at molecular level, a subtractive library was constructed. A total of 31 unique genes were identified from the subtractive library. Nine of the 31 ESTs were significantly induced in Nile tilapia at 6h post infection with A. hydrophila at an injection dose that caused ~20% mortality. Of the nine induced genes, four were also significantly induced in Nile tilapia at 6h post infection with A. hydrophila at an injection dose that caused ~60% mortality. Of the four genes induced by A. hydrophila at both injection doses, three were also significantly induced at 6h post infection with Streptococcus iniae at dose that caused ~70% or ~30% mortality. The ...
Informationen zur Referenz: Atsé, Boua C & K.J. Konan. 2009. Biologie de la reproduction du Cichlidae Tylochromis jentinki dans la lagune Ébrié (Côte dIvoire). Cybium. vol. 33 (n. 1): pp 11-19 (crc02513)
The Nile tilapia, a fish commonly found in our marketplace that makes savory dishes, is not only a source of food but may be useful in rthew management of deseases.
As we mentioned above, the diet for a discus should be varied in order to meet all its nutritional requirements.. One of the most favorite foods of discus fish is bloodworms. They are rich in protein, fiber, and fats thus providing the fish necessary nutrients for proper functioning.. The bloodworms can be administered live or frozen. However, we strictly recommend going for the frozen version as live tubifex worms contain the risk of parasites and food poisoning.. White worms are another popular food for the discus. They are full of proteins and even the fussy eaters enjoy them. They also make a good diet for the breeding discus, as they are high in proteins and allow the fish to quickly add size and mass.. The white worms can be easily cultivated at home using a non-transparent plastic container and a layer of peat soil. You can feed the white worms anything from rice flour and bread soaked in water to pasta and scraps of non-citrus fruits and vegetables.. Once you meet all the requirements of ...
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Spirulina. Aquarist Classified Adverts in the UK. Tropical Fish, Marine, Inverts, Malawi and Tanganyikan Cichlids, Discus, Koi, Tanks and Equipment.
TY - JOUR. T1 - Osmoregulatory actions of growth hormone and prolactin in an advanced teleost. AU - Sakamoto, Tatsuya. AU - Shepherd, Brian S.. AU - Madsen, Steffen S.. AU - Nishioka, Richard S.. AU - Siharath, Kimmakone. AU - Richman, N. Harold. AU - Bern, Howard A.. AU - Grau, E. Gordon. PY - 1997/4. Y1 - 1997/4. N2 - To date, growth hormone (GH) is known to contribute to seawater adaptation only in salmonid fishes (primitive Euteleostei). Accordingly, the effects of homologous GH and two forms of homologous prolactin (PRL177 and PRL188) on hypoosmoregulatory ability and gill Na+,K+-ATPase activity in a more advanced euryhaline cichlid fish, the tilapia (Oreochromis mossambicus), were examined. Following adaptation of hypophysectomized fish to 25% seawater for 3 weeks, fish were given four injections of hormone or vehicle. They were then exposed to 100% seawater for 12 hr and examined for changes in plasma osmolality. Tilapia GH (0.02 and 0.2 μg/g) significantly improved the ability of ...
Results:. The results indicated that increasing the enzyme concentration produced an increase in the DH and in the reaction rate, while increasing the substrate concentration produced a decrease in both parameters. For this reason, a mathematical model was adjusted for the inhibition of substrate from the exponential kinetic equation d(DH)/dt = a*EXP[-b*(DH)] to explain the behavior of the DH as a function of substrate concentration in this hydrolytic process. The parameters a and b were estimated from a nonlinear regression. Based on these results, the reaction constants were determined as Ks = 456.75 g L-1, K2 = 1.2191 min-1, Kd = 0.2224 min-1, KM = 1.8963 and K3 = 0.1173 L g-1 min-1, which allowed the generation of a good correlation between the predicted and experimental values at the different evaluated operating conditions. This correlation was supported by a low average relative error (ARE) of 3.26%. ...
Therapeutic efficacy study, clinical and ecotoxicological safety of the Fosfomicine antibiotic, administered by oral, for Aeromonas hydrophila and Streptococcus agalactiae treatment in Nile Tilapia, Oreochromis niloticus. Scholarships in Brazil Doctorate. Roberto Barbuio. Agronomical Sciences
The frequent bioaccumulation of pharmaceuticals in the aquatic ecosystem has raised a concern about their possible ecotoxicological consequences. DNA damage, haematological changes and activities of oxidative stress enzymes in Nile tilapia, Oreochromis niloticus in response to diclofenac (DCF) exposure were investigated for up to 60 days at the concentrations of 0.17, 0.34 and 0.68mgL−1 in the fis ...
Osteosarcoma (OS) is a common malignant bone cancer. The relatively high density of a persons bone structure means low permeability for drugs, and so finding drugs that can be more effective is important and should not be delayed. MSPs are marine antimicrobial peptides (AMP) and natural compounds extracted from Nile tilapia (Oreochromis niloticus). MSP-4 is a part of the AMPs series, with the advantage of having a molecular weight of about 2.7-kDa and anticancer effects, although the responsible anticancer mechanism is not very clear. The goal of this study is to determine the workings of the mechanism associated with apoptosis resulting from MSP-4 in osteosarcoma MG63 cells. The study showed that MSP-4 significantly induced apoptosis in MG63 cells, with Western blot indicating that MSP-4 induced this apoptosis through an intrinsic pathway and an extrinsic pathway. Thus, a pretreatment system with a particular inhibitor of Z-IETD-FMK (caspase-8 inhibitor) and Z-LEHD-FMK (caspase-9 inhibitor)
Protein concentrate from the residues left after filleting Nile tilapia (Oreochromis niloticus): physical-chemical characterization and sensory acceptance ...
Microscopic investigation sometimes reveals bacterial and/or parasitic infections and in some cases, these infections, like bacterial infections, are secondary.. Sometimes, this syndrome appears when low atmospheric pressure occurs in combination with high humidity, especially for newly imported fish.. COMPLICATION: In some cases, by placing a discus or angel fish from different places of origin in the same row (fish house), or mixing them together in an aquarium makes them sick, especially if one is from Asia and the other is from Europe; for some reason, combining the two places of origin raises the risk for this pest. Fish originating from the same town or province have less or no risk.. This syndrome has not yet been scientifically studied. The symptoms look like an allergic reaction, what with the slimy reaction of the skin and gills that produce excessive mucus. Many of the discus or angel fish are raised in specific, enclosed systems without any contact with other foreign discus or ...
Buy or license direct from the photographer this stunning image of : Fishing Harbour , Kibirizi Fishing Village , Kigoma , Lake Tanganyika , Tanzania