A group of elongate elasmobranchs. Sharks are mostly marine fish, with certain species large and voracious.
A species of shark in the family SQUALIDAE, used for its oil (SQUALENE) and as fish meal. It also figures heavily in biological research, especially with reference to its RECTAL GLAND in studies of WATER-ELECTROLYTE BALANCE.
Sharks of the family Squalidae, also called dogfish sharks. They comprise at least eight genera and 44 species. Their LIVER is valued for its oil and its flesh is often made into fertilizer.
A compound tubular gland, located around the eyes and nasal passages in marine animals and birds, the physiology of which figures in water-electrolyte balance. The Pekin duck serves as a common research animal in salt gland studies. A rectal gland or rectal salt gland in the dogfish shark is attached at the junction of the intestine and cloaca and aids the kidneys in removing excess salts from the blood. (Storer, Usinger, Stebbins & Nybakken: General Zoology, 6th ed, p658)
A subclass of cartilaginous fish comprising the SHARKS; rays; skates (SKATES (FISH);), and sawfish. Elasmobranchs are typically predaceous, relying more on smell (the olfactory capsules are relatively large) than sight (the eyes are relatively small) for obtaining their food.
Communications using an active or passive satellite to extend the range of radio, television, or other electronic transmission by returning signals to earth from an orbiting satellite.
The common name for all members of the Rajidae family. Skates and rays are members of the same order (Rajiformes). Skates have weak electric organs.

Subunit dissociation in fish hemoglobins. (1/556)

The tetramer-dimer dissociation equilibria (K 4,2) of several fish hemoglobins have been examined by sedimentation velocity measurements with a scanner-computer system for the ultracentrifuge and by flash photolysis measurements using rapid kinetic methods. Samples studied in detail included hemoglobins from a marine teleost, Brevoortia tyrannus (common name, menhaden); a fresh water teleost, Cyprinus carpio, (common name, carp); and an elasmobranch Prionace glauca (common name, blue shark). For all three species in the CO form at pH 7, in 0.1 M phosphate buffer, sedimentation coefficients of 4.3 S (typical of tetrameric hemoglobin) are observed in the micromolar concentration range. In contrast, mammalian hemoglobins dissociate appreciably to dimers under these conditions. The inability to detect dissociation in three fish hemoglobins at the lowest concentrations examined indicates that K 4,2 must have a value of 10(-8) M or less. In flash photolysis experiments on very dilute solutions in long path length cells, two kinetic components were detected with their proportions varying as expected for an equilibrium between tetramers (the slower component) and dimers (the faster component); values of K 4,2 for the three fish hemoglobins in the range 10(-9) to 10(-8) M were calculated from these data. Thus, the values of K 4,2 for liganded forms of the fish hemoglobins appear to be midway between the value for liganded human hemoglobin (K 4,2 approximately 10(-6) M) and unliganded human hemoglobin (K 4,2 approximately 10(-12) M). This conclusion is supported by measurements on solutions containing guanidine hydrochloride to enhance the degree of dissociation. All three fish hemoglobins are appreciably dissociated at guanidine concentrations of about 0.8 M, which is roughly midway between the guanidine concentrations needed to cause comparable dissociation of liganded human hemoglobin (about 0.4 M) and unliganded human hemoglobin (about 1.6 M). Kinetic measurements on solutions containing guanidine hydrochloride indicated that there are changes in both the absolute rates and the proportions of the fast and slow components, which along with other factors complicated the analysis of the data in terms of dissociation constants. Measurements were also made in solutions containing urea to promote dissociation, but with this agent very high concentrations (about 6 M) were required to give measureable dissociation and the fish hemoglobins were unstable under these conditions, with appreciable loss of absorbance spectra in both the sedimentation and kinetic experiments.  (+info)

Brain blood flow and blood pressure during hypoxia in the epaulette shark Hemiscyllium ocellatum, a hypoxia-tolerant elasmobranch. (2/556)

The key to surviving hypoxia is to protect the brain from energy depletion. The epaulette shark (Hemiscyllium ocellatum) is an elasmobranch able to resist energy depletion and to survive hypoxia. Using epi-illumination microscopy in vivo to observe cerebral blood flow velocity on the brain surface, we show that cerebral blood flow in the epaulette shark is unaffected by 2 h of severe hypoxia (0.35 mg O2 l-1 in the respiratory water, 24 C). Thus, the epaulette shark differs from other hypoxia- and anoxia-tolerant species studied: there is no adenosine-mediated increase in cerebral blood flow such as that occurring in freshwater turtles and cyprinid fish. However, blood pressure showed a 50 % decrease in the epaulette shark during hypoxia, indicating that a compensatory cerebral vasodilatation occurs to maintain cerebral blood flow. We observed an increase in cerebral blood flow velocity when superfusing the normoxic brain with adenosine (making sharks the oldest vertebrate group in which this mechanism has been found). The adenosine-induced increase in cerebral blood flow velocity was reduced by the adenosine receptor antagonist aminophylline. Aminophylline had no effect upon the maintenance of cerebral blood flow during hypoxia, however, indicating that adenosine is not involved in maintaining cerebral blood flow in the epaulette shark during hypoxic hypotension.  (+info)

Mechanics of ventilation in swellsharks, Cephaloscyllium ventriosum (Scyliorhinidae). (3/556)

A simple two-pump model has served to describe the mechanics of ventilation in cartilaginous and bony fishes since the pioneering work of G. M. Hughes. A hallmark of this model is that water flow over the gills is continuous. Studies of feeding kinematics in the swellshark Cephaloscyllium ventriosum, however, suggested that a flow reversal occurred during prey capture and transport. Given that feeding is often considered to be simply an exaggeration of the kinematic events performed during respiration, I investigated whether flow reversals are potentially present during respiration. Pressure and impedance data were coupled with kinematic data from high-speed video footage and dye studies and used to infer patterns of water flow through the heads of respiring swellsharks. Swellsharks were implanted with pressure transducers to determine the pattern and magnitude of pressures generated within the buccal and parabranchial (gill) cavities during respiration. Pressure traces revealed extended periods of pressure reversal during the respiratory cycle. Further, impedance data suggested that pressures within the buccal and parabranchial cavities were not generated by the cyclic opening and closing of the jaws and gills in the manner previously suggested by Hughes. Thus, the classic model needs to be re-evaluated to determine its general applicability. Two alternative models for pressure patterns and their mechanism of generation during respiration are provided. The first depicts a double-reversal scenario common in the swellshark whereby pressures are reversed following both of the pump stages (the suction pump and the pressure pump) rather than after the pressure-pump stage only. The second model describes a scenario in which the suction pump is insufficient for generating a positive pressure differential across the gills; thus, a pressure reversal persists throughout this phase of respiration. Kinematic analysis based on high-speed video footage and dye studies, however, suggested that during respiration, as opposed to feeding, distinct flow reversals do not result from the pressure reversals. Thus, water is probably pooling around the gill filaments during the long periods of pressure reversal.  (+info)

Electrical parameters of the isolated cornea of the dogfish, Squalus acanthias. (4/556)

The electrical potential difference and electrical resistance of the nonswelling cornea of the dogfish, Squalus acanthias, were examined. It was found that routine procedures used in the procurement of fish invariably produce damage to the corneal epithelium which affects electrical measurements and possibly composition of the aqueous humor. We found no electrical evidence of ionic pumps in the corneal epithelium of this elasmobranch. The electrical resistance of corneas with apparently well-preserved epithelium was 300omega-cm.2 (compared to 30omega-cm.2 in corneas with damaged epithelium).  (+info)

Substitution rates of organelle and nuclear genes in sharks: implicating metabolic rate (again). (5/556)

Rates of nucleotide substitution for nuclear genes are thought to be governed primarily by the number of germ line replication events (the so-called "generation time" hypothesis). In contrast, rates of mitochondrial DNA evolution appear to be set primarily by DNA damage pathways of mutation mediated by mutagenic by-products of oxidative phosphorylation (the so-called "metabolic-rate" hypothesis). Comparison of synonymous substitution rates estimated for the mitochondrial cytochrome b gene and nuclear-encoded dlx, hsp70, and RAG-1 genes in mammals and sharks shows that rates of molecular evolution for sharks are approximately an order of magnitude slower than those for mammals for both nuclear and mitochondrial genes. In addition, there is significant positive covariation of substitution rate for mitochondrial and nuclear genes within sharks. These results, interpreted in light of the pervasiveness of DNA damage by mutagenic by-products of oxygen metabolism to both nuclear and mitochondrial genes and coupled with increasing evidence for cross-genome activity of DNA repair enzymes, suggest that molecular clocks for mitochondrial and nuclear genes may be set primarily by common mutational mechanisms.  (+info)

Rate determination in phosphorylation of shark rectal Na,K-ATPase by ATP: temperature sensitivity and effects of ADP. (6/556)

Phosphorylation of shark rectal Na,K-ATPase by ATP in the presence of Na(+) was characterized by chemical quench experiments and by stopped-flow RH421 fluorescence. The appearance of acid-stable phosphoenzyme was faster than the rate of fluorescence increase, suggesting that of the two acid-stable phosphoenzymes formed, RH421 exclusively detects formation of E(2)-P, which follows formation of E(1)-P. The stopped-flow RH421 fluorescence response to ATP phosphorylation was biphasic, with a major fast phase with k(obs) approximately 90 s(-1) and a minor slow phase with a k(obs) of approximately 9 s(-1) (20 degrees C, pH 7.4). The observed rate constants for both the slow and the fast phase could be fitted with identical second-degree functions of the ATP concentration with apparent binding constants of approximately 3.1 x 10(7) M(-1) and 1. 8 x 10(5) M(-1), respectively. Increasing [ADP] decreased k(obs) for the rate of the RH421 fluorescence response to ATP phosphorylation. This could be accounted for by the reaction of ADP with the initially formed E(1)-P followed by a conformational change to E(2)-P. The biphasic stopped-flow RH421 responses to ATP phosphorylation could be simulated, assuming that in the absence of K(+) the highly fluorescent E(2)-P is slowly transformed into the "K(+)-insensitive" E'(2)-P subconformation forming a side branch of the main cycle.  (+info)

Retropositional parasitism of SINEs on LINEs: identification of SINEs and LINEs in elasmobranchs. (7/556)

Some previously unidentified short interspersed repetitive elements (SINEs) and long interspersed repetitive element (LINEs) were isolated from various higher elasmobranchs (sharks, skates, and rays) and characterized. These SINEs, members of the HE1 SINE family, were tRNA-derived and were widespread in higher elasmobranches. The 3'-tail region of this SINE family was strongly conserved among elasmobranchs. The LINEs, members of the HER1 LINE family, encoded an amino acid sequence similar to that encoded by the chicken CR1 LINE family, and they contained a strongly conserved 3'-tail region in the 3' untranslated region. This tail region of the HER1 LINE family was almost identical to that of the HE1 SINE family. Thus, the HE1 SINE family and the HER1 LINE family provide a clear example of a pair of SINEs and LINEs that share the same tail region. Conservation of the secondary structures of the tail regions, as well as of the nucleotide sequences, between the HE1 SINE family and HER1 LINE family during evolution suggests that SINEs utilize the enzymatic machinery for retroposition of LINEs through the recognition of higher-order structures of the conserved 3'-tail region. A discussion is presented of the parasitism of SINEs on LINEs during the evolution of these retroposons.  (+info)

The main fatty acid-binding protein in the liver of the shark (Halaetunus bivius) belongs to the liver basic type. Isolation, amino acid sequence determination and characterization. (8/556)

Three fatty acid-binding proteins (FABPs) from the liver of the shark Halaetunus bivius were isolated and characterized: one of them belongs to the liver-type FABP family and the other two to the heart-type FABP family. The complete primary structure of the first FABP, and partial primary structures of the two others, were determined. The liver-type FABP constitutes 69% of the total FABPs, and its amino acid sequence presents the highest identity with chicken, catfish, iguana and elephant fish liver basic FABPs. The L-FABP protein has low affinity for palmitic and oleic acids and high affinity for linoleic and arachidonic acids and other hydrophobic ligands, all of them important for the metabolic functions of the liver. In contrast, both heart-type FABPs have the highest affinity for palmitic acid, the principal fatty acid mobilized from fat deposits for beta-oxidation.  (+info)

I'm sorry for any confusion, but "sharks" are not a medical term. Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral and dorsal fins without spines.

If you have any medical questions or terms that you would like defined, I'd be happy to help!

'Squalus acanthias' is the scientific name for the species known as the spiny dogfish shark. While it is sometimes used in medical contexts, such as in research or when discussing potential zoonotic diseases, it is not a medical condition or disease itself. Therefore, there isn't a formal medical definition for 'Squalus acanthias'. However, I can provide some information about this species.

The spiny dogfish shark is a small shark species, with adults reaching an average length of 3 to 4 feet (about 1 meter). They are found in temperate and cold waters worldwide, including the Atlantic and Pacific Oceans. The 'acanthias' part of their scientific name refers to the presence of spines on their dorsal fins, which they can use to defend themselves against predators.

Spiny dogfish sharks play an essential role in marine ecosystems as both predators and prey. They feed on various fish species and invertebrates, while larger sharks, seals, and sea lions may prey upon them. The meat, skin, liver oil, and cartilage of spiny dogfish sharks have been used in human industries such as food, leather production, and dietary supplements. However, overfishing has led to population declines in some regions, making the species a subject of conservation concern.

A "dogfish" is a common name that refers to several species of small sharks. The term is not a formal medical or scientific term, but rather a colloquial one used to describe these marine animals. There are two main types of dogfish: the spiny dogfish (Squalus acanthias) and the smooth dogfish (Mustelus canis).

The spiny dogfish is characterized by two dorsal fins, the second of which is larger than the first and has a venomous spine. This species is found in both the Atlantic and Pacific Oceans and can grow up to about three feet in length. The smooth dogfish, on the other hand, lacks spines on its dorsal fins and is found primarily in warmer waters along the coasts of North and South America.

While not a medical term, it's worth noting that some species of dogfish are used in medical research and have contributed to our understanding of various physiological processes. For example, the electric organs of certain types of dogfish have been studied for their potential applications in nerve impulse transmission and muscle contraction.

A salt gland is a type of exocrine gland found in certain animals, including birds and reptiles, that helps regulate the balance of salt and water in their bodies. These glands are capable of excreting a highly concentrated solution of sodium chloride, or salt, which allows these animals to drink seawater and still maintain the proper osmotic balance in their tissues.

In birds, salt glands are typically located near the eyes and are responsible for producing tears that contain high levels of salt. These tears then drain into the nasal passages and are eventually expelled from the body. In reptiles, salt glands can be found in various locations, depending on the species, but they serve the same function of helping to regulate salt and water balance.

It's worth noting that mammals do not have salt glands and must rely on other mechanisms to regulate their salt and water balance, such as through the kidneys and the production of sweat.

'Elasmobranchii' is a superorder in the class Chondrichthyes, which includes all sharks, skates, rays, and sawfishes. This group is characterized by several distinct features, including:

1. Cartilaginous skeletons: Unlike bony fishes, elasmobranchs have skeletons made of cartilage rather than bone.
2. Five to seven gill slits: Most elasmobranchs have five pairs of gill slits on each side of their body, although some species may have six or seven pairs. These gill slits are open to the outside environment and lack protective covers found in bony fishes.
3. Heterocercal tail: Elasmobranchs possess a unique tail structure called a heterocercal tail, where the upper lobe is longer than the lower lobe. This tail design provides powerful propulsion and maneuverability in the water.
4. Dermal denticles: The skin of elasmobranchs is covered with small, tooth-like structures called dermal denticles, which provide a protective covering and reduce friction while swimming.
5. No swim bladders: Unlike bony fishes, elasmobranchs do not have a gas-filled swim bladder to help maintain buoyancy. Instead, they rely on their large liver, which contains low-density oil, to provide some degree of buoyancy.
6. Electrosensory organs: Many elasmobranchs possess specialized sensory organs called the ampullae of Lorenzini, which allow them to detect electric fields generated by living organisms and other environmental sources. This ability aids in hunting, navigation, and communication.
7. Carnivorous diet: Elasmobranchs are primarily carnivorous, feeding on various marine animals such as fish, squid, and crustaceans. Some species may also consume smaller elasmobranchs.
8. Live birth or egg laying: Most elasmobranchs reproduce by giving live birth (viviparity), where the embryos develop inside the mother's body and receive nourishment through a placenta-like structure. However, some species lay eggs (oviparity) in protective cases called mermaid's purses.
9. Slow growth and late maturity: Elasmobranchs generally grow slowly and reach sexual maturity at a relatively advanced age compared to many bony fishes. This slow life history makes them particularly vulnerable to overfishing and other human-induced threats.

I'm sorry for any confusion, but "Satellite Communications" is not a term typically used in medical definitions. Satellite communications refers to the use of artificial satellites in space to provide communication links between various points on Earth. This technology is widely used in many fields including telecommunications, broadcasting, military, and transportation, but it is not a medical concept. If you have any questions related to medical terminology or concepts, I'd be happy to help with those instead!

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Class Chondrichthyes contains the subclasses Elasmobranchii (sharks and rays) and Holocephali (chimaeras and ghost sharks). ... Many sharks, skates, and rays are difficult subjects for taxonomic study. The taxonomic review provides principal identifying ... Sharks, Rays: The classification of chondrichthyans is a somewhat controversial subject. ... Family Carcharhinidae (tiger sharks, blue sharks, and relatives). The largest family of sharks, including the tiger shark, the ...
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North Shore surf photographer Brent Bielmann shows how he shoots in the surf.
... founders of Matri presented their pitch before the shark panel and also received applause from sharks. Even, Shark Anupam ... In Episode 24 of Shark Tank India Season 3, the entrepreneur reality show witnessed, Matri - The Off Switch of Menstrual Pain. ... founders of Matri presented their pitch before the shark panel and also received applause from sharks. Even, Shark Anupam ... Shark Tank India Season 3 is currently streaming on SonyLIV.. The post Shark Tank India Season 3: What is Matri? appeared first ...
Information about shark attacks with photos of victims and sharks. Shark attack. news section and discussi.... Fionas Shark ... SHARK BITE ?. Discovery Channels Shark Week. Brief information on a variety of sharks, from the Great Whites to Hammerheads.. ... Shark Friends. Facts and photos about sharks and other ocean animals.. NOVA Online: Island of the Sharks. Information about ... The International Shark Attack File. A database of shark attacks as well as information on how, why, and where sharks. attack, ...
Microsoft ended its Sharks Cove blog post like this:. We're very excited and proud of the work done to make the Sharks ... Microsoft debuts Sharks Cove, a costly Raspberry Pi alternative First teased during its April Build conference, the Raspberry ... Microsoft has finally joined the mini PC craze, introducing a Windows-compatible development board dubbed Sharks Cove. ... required to apply it to the Sharks Cove. ...
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SHARK ATTACK. Dr. Evil:. You know, I have one simple request. And that is to have sharks with frickin laser beams attached to ... Back in the spring, I figured this research was in its earliest, most basic stages -- getting a sense of what makes a shark ... Earlier this year, the Navy began to do research on the possibility of using sharks as spies. Progress, apparently, has been ... Boston University professor Jelle Atema can actually "steer a shark" -- either through "electrical stimulation of the brain" or ...
... As top predators in the Pacific, marine mammals, sharks, and tuna play a crucial role in the balance ... Shark Research Lab Investigating the behavior, physiology, and ecology of sharks and other fish while focusing on Marine ... Work at the Hawaii Institute of Marine Biology with multiple mammal, shark, and tuna species continues to advance our ... Proximate to year-round marine mammal populations, shark nursery grounds, and the tuna-rich waters of the central Pacific, ...
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San Jose Sharks forward Evander Kane cleared waivers on Monday and is expected to be assigned to the AHLs San Jose Barracuda. ... San Jose Sharks forward Evander Kane cleared waivers on Monday and is expected to be assigned to the AHLs San Jose Barracuda. ... "We were not surprised by the Sharks decision to put him on waivers and, if he does clear, he will report to the Barracuda. ...
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The shark battled for 40 minutes before angler Jamie Doucette, 28, of Wedgeport, Nova Scotia, saw its enormousness. ... The shark battled for 40 minutes before angler Jamie Doucette, 28, of Wedgeport, Nova Scotia, saw its enormousness. "She felt ... Doucette reeled it in and other anglers wrapped it in ropes as the shark chewed through the knots. One loop circled its torso, ... In a scene reminiscent of "Jaws," the fish tugged the boat sideways during the Yarmouth Shark Scramble off Nova Scotia in ...
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  • San Jose, CA (SportsNetwork.com) - Antti Niemi made 29 saves for his second shutout of the season and the red-hot San Jose Sharks beat the Nashville Predators 2-0 on Saturday night. (foxnews.com)
  • sjsharks.com is the official website of the San Jose Sharks. (nhl.com)
  • San Jose Sharks name and primary logo are registered trademarks of San Jose Sharks, LLC. (nhl.com)
  • San Jose Sharks to hire Mike Grier as 1st Black GM in NHL hi. (zoominfo.com)
  • Mike Grier has been named general manager of the San Jose Sharks, becoming the first Black man in NHL history to hold the position. (zoominfo.com)
  • The NHL's San Jose Sharks have been a model of organizational stability. (zoominfo.com)
  • San Jose Sharks has become the first NHL team to accept cryptocurrencies such as Bitcoin (BTC), Ethereum (ETH) and Dogecoin (DOGE) for large payments. (zoominfo.com)
  • The San Jose Sharks have reached a settlement agreement with the city and Google over the tech company's downtown mega campus. (zoominfo.com)
  • Where is San Jose Sharks located? (zoominfo.com)
  • How many employees does San Jose Sharks have? (zoominfo.com)
  • What industry does San Jose Sharks belong to? (zoominfo.com)
  • What technology does San Jose Sharks use? (zoominfo.com)
  • How do I contact San Jose Sharks? (zoominfo.com)
  • What are San Jose Sharks social media links? (zoominfo.com)
  • Is San Jose Sharks a public company? (zoominfo.com)
  • SAN JOSE, Calif. -- Although Dan Boyle felt betrayed when the Tampa Bay Lightning decided to trade him, the standout defenseman is feeling much better about it after landing with the San Jose Sharks . (espn.com)
  • At the meeting, delegates agreed to include all seven shark species in the Convention on the Conservation of Migratory Species of Wild Animals (CMS): the Great White, Basking, Whale, Porbeagle, Spiny Dogfish, Shortfin and Longfin Mako Sharks. (sustainablebusiness.com)
  • Some species such as Mako Sharks are targeted for sports fishing, trophy hunting, and as cure in traditional medicine. (sustainablebusiness.com)
  • At the point at which the darkness begins, sharks find light-sensitive creatures like bioluminescent lantern fish, as well as bigeye tuna, blue sharks, and mako sharks. (slashgear.com)
  • Government representatives meeting in Manila, Philippines, agreed on the text of a Memorandum of Understanding on the conservation of migratory sharks. (sustainablebusiness.com)
  • The goal of the CMS agreement is the restoration and long term viability of populations of migratory sharks covered by the instrument. (sustainablebusiness.com)
  • CMS Appendix I lists migratory sharks that are threatened with extinction. (sustainablebusiness.com)
  • The biological reaction to this decline was a gradual surge of the seal and sea lion populations, including in Cape Cod-which, taken in tandem with conservation efforts, has gradually restored the white shark population, although current estimates remain in the thousands. (medscape.com)
  • Since 2009, Pew's Global Shark Conservation Campaign has helped countries establish shark sanctuaries in their oceans. (pewtrusts.org)
  • While these countries are taking meaningful action on shark conservation, more needs to be done around the globe. (pewtrusts.org)
  • CMS Executive Secretary Elizabeth Maruma Mrema said: 'This first global CMS instrument on commercially exploited species is a decisive step forward in international shark conservation. (sustainablebusiness.com)
  • A conservation and management plan was thoroughly discussed as a first step towards international cooperation on the protection of sharks. (sustainablebusiness.com)
  • According to the IUCN Red List of the World Conservation Union, 14 shark species are 'critically endangered' and face an extremely high risk of extinction in the wild. (sustainablebusiness.com)
  • The first global instrument on sharks is expected to complement existing international wildlife conservation agreements, fisheries agreements and regional fisheries management organizations. (sustainablebusiness.com)
  • In contrast to pelagic species, such as whale sharks and white sharks that may cross ocean basins mandating cooperative international efforts for conservation, grey nurse shark needs to be managed regionally," says Stow. (abc.net.au)
  • Shark conservation is a global problem and needs global solutions. (sharktrust.org)
  • From raising awareness about shark conservation, to taking part in one of our citizen science projects - we've got something for all ages. (sharktrust.org)
  • We work in shark conservation because a 1/3 of all sharks and rays are threatened with extinction. (sharktrust.org)
  • Join us for a fun evening to test your knowledge and raise money for shark conservation. (sharktrust.org)
  • Examining two common species of sharks on the Great Barrier Reef in Australia, the researchers found that both populations are in the midst of a rapid population decline - 7% per year for white tip sharks and 17% per year for gray reef sharks, showing that current shark conservation strategies are not effective. (mongabay.com)
  • The declining shark population could lead to unintended consequences in marine ecosystems, such as the collapse of commercially and ecologically important fish populations. (pewtrusts.org)
  • Total catches in global shark fisheries are still increasing, while some populations have already crashed. (sustainablebusiness.com)
  • Partnership is vital to safeguarding shark, skate and ray populations around the world. (sharktrust.org)
  • Coral reef shark populations are declining rapidly due to fishing according to research published in the December 5th issue of the journal Current Biology . (mongabay.com)
  • Citation: "Ongoing Collapse of Coral-Reef Shark Populations. (mongabay.com)
  • Shark cartilage is the tissue that provides support for fins in sharks (Squalus acanthias). (medlineplus.gov)
  • High demand and price of shark fins have triggered increased hunting activities. (sustainablebusiness.com)
  • Sharks are increasingly threatened by commercial fishing - especially for their fins which are considered a delicacy in some Asian countries. (mongabay.com)
  • A study published in the October 2006 edition of Ecology Letters estimates that between 26 million and 73 million sharks are killed each year for their fins. (mongabay.com)
  • In 2016, Shark's breakout single "Adore[1]" gained prominence in Australia and truly put Shark on the map. (dujour.com)
  • Humans are not the regular prey of sharks, although in rare occasions they do mistake us for such. (medscape.com)
  • [ 3 ] It peaked with the release of the 1975 movie Jaws , in which a great white shark was depicted as a monster out to prey on humans. (medscape.com)
  • As the population of sharks and humans are both growing, encounters between the two are becoming more frequent. (medscape.com)
  • A comprehensive understanding of predation is critical to prevent interactions between sharks and humans. (medscape.com)
  • It was previously suggested that sharks don't get cancer, so consuming their cartilage might help prevent cancer in humans. (medlineplus.gov)
  • But it is now clear that sharks do get cancer, and research hasn't shown benefits for cancer in humans. (medlineplus.gov)
  • WEDNESDAY, Nov. 8, 2023 (HealthDay News) -- Forget "Jaws": The remarkable wound-healing power of shark skin could end up helping humans, new research claims. (msdmanuals.com)
  • Sharks may be less likely to get cancer than humans because of their abundance of ECM, which just so happens to be a major component of cartilage," said David Hall, group leader of the NIAMS Cartilage Biology and Orthopaedics Branch, who had studied the cartilage-anticancer connection for several years before turning more of his attention to osteoporosis and arthritis. (nih.gov)
  • Naveron Lesch gave up working on traditional fishing boats to work as shark spotter in South Africa. (businessinsider.com)
  • This as-told-to essay is based on a conversation with Naveron Lesch, a 35-year-old professional shark spotter in Cape Town, South Africa. (businessinsider.com)
  • Stow and team collected 193 fin and muscle samples of grey nurse sharks from five regions - Japan, South Africa, Brazil, north-west Atlantic and eastern and western Australia. (abc.net.au)
  • In fact, nearly 100 million sharks are killed every year and almost a third of shark species are threatened or near threatened with extinction. (pewtrusts.org)
  • According to the IUCN Red List 2010, 17% of 1,044 shark species are threatened. (sustainablebusiness.com)
  • 1/3 of all shark, skate, ray and chimaera species are threatened with extinction, largely due to the impact of unsustainable fisheries. (sharktrust.org)
  • Although a shark finning ban was adopted as of mid 2007 by 19 countries, the European Union and 9 Regional Fisheries Management Organizations for fishing vessels in their waters, sharks continue to be hunted. (sustainablebusiness.com)
  • Tomas Hertl's goal 5:01 into the game stood up as the winner and Joe Thornton added an empty-netter late as the Sharks improved to 7-1 in their last eight games. (foxnews.com)
  • San Jose was obviously the top team I wanted to go to," said Boyle, who has suited up for Canada alongside Sharks stars Joe Thornton , Patrick Marleau and Blake. (espn.com)
  • The researchers say that because sharks are "apex predators" that play an important role in "maintaining healthy reef ecosystems", their decline threatens the overall welfare of the reef ecosystem. (mongabay.com)
  • Shark attacks are more likely in conditions where sharks can't see well, for example in dim light or murky water, such as occurs after a storm. (medscape.com)
  • There's some new technology available now that will deter shark attacks. (geekalerts.com)
  • The victim ignored a surfing ban that had been put in place to prevent shark attacks in this region. (sharkattacksurvivors.com)
  • Bull sharks hunt in areas where rivers flow into the ocean. (medscape.com)
  • This is a Caribbean reef shark, an opportunistic feeder with a preference for an easily scavenged meal over the need to hunt. (astronomy.com)
  • Prior shark research conducted at other centers has already led to the creation of a new antibiotic, the researchers noted, and provided some key insights into the underpinnings of cystic fibrosis. (msdmanuals.com)
  • The most recent clinical trials, sponsored by the NCI and the Mayo Clinic, involved a liquid extract of shark cartilage called Neovastat, administered orally. (nih.gov)
  • The Bouqs Company co-founder John Tabis shakes hands with ABC's "Shark Tank" shark Robert Herjavec, who made a deal with Tabis years after his appearance on the show. (go.com)
  • When founder John Tabis brought The Bouqs Company to ABC's "Shark Tank" in 2014, it seemed that all the "sharks" hated the product. (go.com)
  • Watch the full story on ABC News '20/20' -- 'Shark Tank on 20/20' -- THIS FRIDAY at 10 p.m. (go.com)
  • But when Tabis entered the Shark Tank in 2014, Herjavec says he thought Tabis did a "bad job" with the presentation. (go.com)
  • We did in 24 hours more than we had done in the entire year leading up to the 'Shark Tank' appearance. (go.com)
  • Three years after Bouqs appeared on 'Shark Tank,' Herjavec said he was shocked by the price of flowers while shopping for them ahead of his wedding to his " Dancing With the Stars " partner, Kym Johnson . (go.com)
  • At the core of RADx Tech operations is the "innovation funnel" rapid review process, popularized as a shark tank [4]. (nih.gov)
  • But its popularity led to a decline in shark numbers. (medlineplus.gov)
  • A new landmark agreement to counteract the alarming decline of sharks was concluded on Friday under the auspices of the United Nations Environment Programme (UNEP). (sustainablebusiness.com)
  • Robbins and colleagues say that immediate action is needed to stem shark population decline on the Great Barrier Reef. (mongabay.com)
  • It's long been known that sharks have an unusual ability to quickly heal and recover from wounds, explained researchers Jakob Wikström , an associate professor of dermatology and principal investigator at Karolinska, and his colleague, senior study author Etty Bachar-Wikström . (msdmanuals.com)
  • How do sharks heal so quickly from wounds? (msdmanuals.com)
  • Shark cartilage became a popular medicine in the 1970s. (medlineplus.gov)
  • People use shark cartilage for cancer, scaly itchy skin (psoriasis), osteoarthritis, and many other conditions, but there is no good scientific evidence supporting these uses. (medlineplus.gov)
  • Don't confuse shark cartilage with bovine cartilage, or with chondroitin, which can be sourced from shark cartilage. (medlineplus.gov)
  • There is interest in using shark cartilage for a number of other purposes, but there isn't enough reliable information to say whether it might be helpful. (medlineplus.gov)
  • Shark cartilage is possibly safe when used for up to 40 months. (medlineplus.gov)
  • There isn't enough reliable information to know if shark cartilage is safe to use when pregnant or breast-feeding. (medlineplus.gov)
  • Shark cartilage might cause the immune system to become more active. (medlineplus.gov)
  • If you have one of these conditions, it's best to avoid using shark cartilage. (medlineplus.gov)
  • Shark cartilage contains calcium and might increase calcium levels. (medlineplus.gov)
  • Do not use shark cartilage if you already have high calcium levels. (medlineplus.gov)
  • Shark cartilage can increase the activity of the immune system. (medlineplus.gov)
  • Taking shark cartilage along with these medications might decrease the effects of these medications. (medlineplus.gov)
  • If shark cartilage is added to a fruit juice to improve flavor, it should be consumed right away. (medlineplus.gov)
  • There isn't enough reliable information to know what an appropriate dose of shark cartilage might be. (medlineplus.gov)
  • Pro-inflammatory properties of shark cartilage supplement. (medlineplus.gov)
  • Back in the early 1990s, the shark cartilage craze was in full bloom. (nih.gov)
  • Inspired by a best-selling 1992 book "Sharks Don't Get Cancer," both healthy people and those stricken with cancer were popping pills of pulverized shark cartilage with hopes of staying healthy or even completely curing themselves of malignant tumors. (nih.gov)
  • The logic, according to author William Lane, was that sharks rarely get cancer compared with most other animals, and the defining feature of their biology, aside from a healthy diet of fish, was a skeletal system made of cartilage rather than bone. (nih.gov)
  • Unfortunately, shark cartilage did not live up to its reputation. (nih.gov)
  • Sharks reportedly are not pleased with the use of their cartilage as a cancer cure. (nih.gov)
  • Gradually the research turned to shark cartilage, because pound for pound, sharks have more cartilage than cows. (nih.gov)
  • Also, researchers thought that shark cartilage might be more active than bovine cartilage in preventing new blood vessels from being formed. (nih.gov)
  • To date over a dozen clinical trials have been conducted on shark cartilage as a cancer treatment. (nih.gov)
  • Sharks patrolling a reef usually have a slow, relaxed motion. (astronomy.com)
  • These findings indicate that current management of no-take areas is inadequate for protecting reef sharks, even in one of the world's most-well-managed reef ecosystems. (mongabay.com)
  • As an example, the authors cite overfishing of sharks as a possible contributing factor to the collapse of Caribbean coral-reef ecosystems. (mongabay.com)
  • White tip reef shark under a ledge in the Northwestern Hawaiian Islands reserve. (mongabay.com)
  • Our data suggest that for coral-reef sharks, immediate and substantial reductions in shark fishing will be required for their ongoing collapse to be reversed. (mongabay.com)
  • We all passed on it," shark Robert Herjavec told ABC News. (go.com)
  • However, "much more is known about fish biology than shark biology, for obvious reasons," Wikström explained in an MBL news release. (msdmanuals.com)
  • In the United States, the majority of bites come from bull sharks near the beaches of Florida, [ 3 ] whereas great whites account for more bites than other species. (medscape.com)
  • Since the late 1980s Whale Shark meat has been increasingly considered as a high-grade product and gained acceptance by consumers as an exotic food, and prices began to skyrocket. (sustainablebusiness.com)
  • TRAFFIC, the wildlife trade monitoring network, reported 2000 kg of Whale Shark meat sold in Taiwan for US$7,000 (EUR 4,500). (sustainablebusiness.com)
  • High demand for shark fin soup means sharks are hunted more than ever. (pewtrusts.org)
  • But such incidents remain very rare, and sharks are not the villains depicted in the movies. (medscape.com)
  • [ 3 ] There have only been about 5000 recorded incidents of sharks biting people in the past century, and of these, less than one quarter were fatal. (medscape.com)
  • Scientists from Stanford University and the Monterey Bay Aquarium in CA, USA, led an expedition this year to this shark-centric gathering. (slashgear.com)
  • Wikström noted that scientists have already created wound-healing treatments based on research in codfish, so "it's possible that one could make something similar from sharks. (msdmanuals.com)
  • Over-fishing, fisheries by-catch, illegal trade, habitat destruction, depletion of prey species, pollution with a high risk of mercury intoxication, boat strikes and the impact of climate change on the marine environment seriously threaten sharks. (sustainablebusiness.com)
  • Valuable fish and crustacean fisheries such as high sea long-line and driftnet fleets that target tuna, sword fish, sail fish and marlin claim an unsustainably high death toll on sharks. (sustainablebusiness.com)
  • We need to change our understanding and appreciation for sharks. (sharktrust.org)
  • The Predators were without captain Shea Weber for a time in the second period after the defenseman was cut under his arm when he came down on the left skate of Sharks forward Tye McGinn at the end of a check in the second period. (foxnews.com)
  • Use these social-bookmarking links to share Genes reveal grey nurse sharks at risk . (abc.net.au)
  • Whenever I can, I dive with sharks. (medscape.com)
  • A local dive shop features pictures of celebrities who have come to watch divers hand-feed sharks. (astronomy.com)
  • The Predators went 3-0 against the Sharks last season, beating Niemi each time. (foxnews.com)
  • At Voyage to the White Shark Cafe, the project team has not only information about the area and the migration, but data on individual sharks, too. (slashgear.com)
  • We would spend time up on the mountain learning how a Cape fur seal looked in the water, how a sunfish looked, how to tell a "bronzie" - a bronze whaler shark - from a great white shark. (businessinsider.com)
  • There's a spot in the Pacific Ocean between Hawaii and Mexico where great white sharks hang en masse. (slashgear.com)
  • Every December of every year for the past 14 years (at least), there's been a massive meeting of great white sharks in the Pacific Ocean. (slashgear.com)
  • Throughout the months of April and May of this year, researchers tracked a large number of great white sharks as they moved through their White Shark Cafe adventure. (slashgear.com)
  • One has to do with V-shaped dives performed by great white sharks in the White Shark Cafe area during the month of April. (slashgear.com)
  • Despite not being able to spend enough minutes in the Dragons' half to apply pressure, the Sharks displayed a great deal of patience. (timeslive.co.za)
  • With great stability, solubility, and ability to penetrate tissues and bind with hidden functional sites in target proteins, shark VNAR possess distinct advantages over conventional antibodies as novel therapeutics in cancer and other diseases. (nih.gov)
  • The shark spotters operate on four beaches in Cape Town all through the year, and then we have another two beaches that we monitor on weekends, public holidays, and school holidays. (businessinsider.com)
  • These biological characteristics make sharks particularly vulnerable with little chance to recover if overfished. (sustainablebusiness.com)
  • Sharks' Gerbrandt Grobler breaks away during the Challenge Cup match against the Dragons at Rodney Parade on January 21, 2024 in Newport, South Wales. (timeslive.co.za)
  • As this shark swims past, something catches its attention. (astronomy.com)
  • Shark deterrent devices may be worthwhile for people who spend a lot of time in the ocean. (medscape.com)
  • Which means it's time to revisit the greatest winter-themed, shark-chomping horror movie ever made. (gearjunkie.com)
  • It is far from the first time that I've encountered a shark under water. (astronomy.com)
  • This was the first time that the Sharks registered back-to-back wins this season after they beat Oyonnax last weekend. (timeslive.co.za)
  • Macquarie University biologist Dr Adam Stow and colleagues report in a recent issue of the journal Molecular Ecology that each population of grey nurse sharks worldwide is a distinct genetic entity. (abc.net.au)
  • A genetic study has shown the endangered population of grey nurse sharks off the east coast of Australia cannot rely on its cousins for help. (abc.net.au)
  • We believe the low genetic variation … is a historic consequence of a small number of individual [sharks] founding the original population," says Stow. (abc.net.au)
  • Mass hysteria ensued as holistic enthusiasts sought over-the-counter quick preventatives at the expense of the shark population. (nih.gov)
  • I got my first good look at a shark bite a couple of years ago, when a woman jumped off her surfboard and was bitten just above the knee. (medscape.com)
  • For millions of years, sharks were at the top of the food chain, keeping marine ecosystems in balance. (pewtrusts.org)
  • Sharks have high life-expectancy: Whales Sharks can live up to 100 years. (sustainablebusiness.com)
  • It occurs in a variety of different species, including many sharks and rays. (sharktrust.org)
  • The story of the white shark tells you that this area is vitally important in ways we never knew about," said one of the expedition leaders, Salvador Jorgensen (also research scientist for the Monterey Bay Aquarium. (slashgear.com)
  • Amy Shark tells stories through her music, welcoming listeners into her personal life with her relatable lyrics. (dujour.com)
  • While the Sharks continued to dominate the hosts in the second stanza, they didn't make a lot of entries into the Dragons 22. (timeslive.co.za)
  • Like a jigsaw, there are many pieces that make up the big picture - a positive future for sharks relies on all the pieces coming together. (sharktrust.org)
  • It mainly comes from sharks caught in the Pacific Ocean. (medlineplus.gov)
  • Huffmanela cf. carcharhini (Nematoda: Trichosomoididae: Huffmanelinae) from skin of a sandbar shark, Carcharhinus plumbeus, in the Pacific Ocean. (nih.gov)
  • After signing longtime Los Angeles Kings bruiser Rob Blake to a one-year, $5 million free-agent contract Thursday, the Sharks fought off several suitors to land Boyle, one of the NHL's top puck-moving defensemen. (espn.com)
  • If we sight a shark, we'll radio the spotter down on the beach and, if necessary, set off the shark siren to clear the water. (businessinsider.com)
  • It's not yet clear exactly what the sharks are doing at these depths. (slashgear.com)
  • Shark science is at the heart of our work, allowing us to set priorities and generate evidence to support change. (sharktrust.org)
  • We saw a Shark Attack Mug before, but in my opinion this Shark Week Shark Drink Mug is even cooler. (geekalerts.com)
  • From the Discovery Channel Store, this shark mug is a perfect gift idea for anyone that likes to watch shark week. (geekalerts.com)
  • Shark Week is a renowned cultural phenomenon - but Plymouth is going bigger and better this summer by welcoming Shark Month to Royal William Yard this July. (sharktrust.org)
  • This is the White Shark Cafe, and it's not the plot of a fictional story - it's a real place. (slashgear.com)
  • Sharks in the White Shark Cafe area dove down to around 1,400 feet below the surface during the day. (slashgear.com)
  • We have doubled the current 20-year data set on white shark diving behaviors and environmental preferences in just three weeks," said Block (in the present, also part of this new research team. (slashgear.com)
  • An abundance of information can also be found at the site Voyage to the White Shark Cafe . (slashgear.com)
  • FUN FACT: Tom Johnson is the "oldest and longest studied white shark in the world. (slashgear.com)
  • He was also, according to the project above, one of the first sharks to show Block that the White Shark Cafe existed! (slashgear.com)
  • Anyone who sees a shark while swimming should leave the water as quickly and quietly as possible. (medscape.com)
  • Microscopic examination of a skin scraping revealed nematode eggs of the genus Huffmanela, a group of histozoic nematodes that is known to parasitize requiem sharks and marine and freshwater teleosts. (nih.gov)
  • I should honestly try to see if I could sit down with a shark specialist or marine biologist sometime to get some ideas. (ellorytheshark.com)
  • According to the Food and Agricultural Organization (FAO), up to 900,000 metric tons of sharks have been caught every year for the last two decades. (sustainablebusiness.com)
  • A wild-caught captive sandbar shark Carcharhinus plumbeus developed a contiguous network of darkly pigmented linear tracks that progressed from the snout to the ventral cervical region. (nih.gov)
  • Sharks do bite people. (medscape.com)
  • As the number of people swimming increases, so too has the incidence of shark bites. (medscape.com)
  • Avoid areas where there are seals or sea lions, or where people are fishing with bait, both of which may attract sharks. (medscape.com)
  • At each beach, we have spotters up on the mountainside with polarized sunglasses and binoculars who scan the water to monitor the movement of sharks and how close they are to people. (businessinsider.com)
  • Shark skin is coated with a special film of mucus that more closely resembles mucus generated by people than that generated by other types of fish, noted researchers at Sweden's Karolinska Institute, in Stockholm. (msdmanuals.com)
  • The Sharks acquired Boyle from Tampa Bay in a four-player deal Friday, trading defenseman Matt Carle and top prospect Ty Wishart to the Lightning to add their second star defenseman in two days. (espn.com)
  • San Jose lost defenseman Brian Campbell to Chicago on Tuesday in a lavish free-agent deal, but the Sharks quickly compensated by adding three proven winners to their blue line. (espn.com)
  • Every "shark" passed on making a deal with The Bouqs Company in 2014. (go.com)
  • Despite not getting a deal with the sharks, The Bouqs Company has thrived. (go.com)
  • When shark Mark Cuban learned how successful the Bouqs Company has become, he expressed his regret for not getting in the deal when he had the chance. (go.com)
  • The research hopes to bring out the shark in all of us. (nih.gov)
  • We work with national and international policymakers to secure policy change and ensure implementation to safeguard sharks. (sharktrust.org)
  • By donating, you are supporting the important work we do for sharks and rays! (sharktrust.org)