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  • larval sea lamprey
  • The extensive larval mapping project and estimate of the larval sea lamprey population were completed. (glfc.org)
  • A pilot study was successfully completed in 1992 which determined the feasibility of using a deepwater electroshocker and global positioning system equipment to take spatially referenced samples of the larval sea lamprey population in the St. Marys River and to map larval population density. (glfc.org)
  • hagfishes
  • Serial transverse sections of the most primitive living vertebrates, the cyclostomes(lampreys and hagfishes), were prepared and studied from viewpoints of functional anatomy ana phylogeny. (nii.ac.jp)
  • Craniates comprise all fishes - including such jawless fishes as hagfishes and lampreys - amphibians, reptiles, birds and mammals, including Man. (tolweb.org)
  • Since the early nineteenth Century, and until recently, the hagfishes were regarded as the sister-group of lampreys (Hyperoartia). (tolweb.org)
  • However, lampreys share with jawed vertebrates, or Gnathostomata, a large number of morphological and physiological characteristics that occur neither in hagfishes, nor in non-craniate chordates (cephalochordates and tunicates). (tolweb.org)
  • There is, therefore, a rather broad consensus over the theory that hagfishes are the sister-group of the Vertebrata (lampreys and gnathostomes). (tolweb.org)
  • gnathostomes
  • The unique morphological characteristics of lampreys, such as their cartilaginous skeleton , suggest they are the sister taxon (see cladistics ) of all living jawed vertebrates ( gnathostomes ), and are usually considered the most basal group of the Vertebrata. (wikipedia.org)
  • Hagfish , which resemble lampreys, have traditionally been considered the sister taxon of the true vertebrates (lampreys and gnathostomes) but DNA evidence suggests that they are in fact the sister taxon of lampreys. (wikipedia.org)
  • As no neuromeric patterns are apparent in the amphioxus, the development of the CNS in the lamprey, the sister group of the gnathostomes, is a crucial issue. (biologists.org)
  • pheromone
  • Taken together, these data suggest that adult lamprey use a bile acid based larval pheromone to help them locate spawning rivers and that responsiveness to this cue is influenced by current flow, maturity, and time of day. (usgs.gov)
  • Although the precise identity and function of the larval pheromone remain to be fully elucidated, we believe that this cue will ultimately prove useful as an attractant in sea lamprey control. (usgs.gov)
  • After 15 years' work, Peter Sorensen and his colleagues have isolated and synthesized a pheromone they say will attract large numbers of lamprey, to improve the performance of various control methods. (publicradio.org)
  • Now, researchers have discovered a lamprey "perfume," a pheromone or chemical attractant that could be a big help in their fight against one of the most destructive invasive species. (publicradio.org)
  • Just one larva attracts a lot of adult lamprey, indicating the pheromone is very potent. (publicradio.org)
  • Sorensen says fisheries managers could use the pheromone to attract more lampreys to streams outfitted with traps. (publicradio.org)
  • Now, the Environmental Protection Agency has granted the first-ever permit to experiment with a lamprey pheromone on the Trout River in Michigan. (publicradio.org)
  • genome
  • We previously showed that wild-type adult C. elegans that transiently passed through the stress-induced dauer larval stage (post-dauers) exhibit different gene expression patterns, genome-wide chromatin structure, and life history traits when compared to adults that bypassed the dauer stage (controls). (omicsdi.org)
  • Real time quantitative PCR confirmed expression of representatives of all 3 chemoreceptor gene families identified in the sea lamprey genome. (biomedcentral.com)
  • Finally, the lamprey genome has been sequenced, so that molecular homologs of human genes can be identified and cloned. (oxfordre.com)
  • distinct
  • We find that the chromatin state and endo-siRNA distribution in dauers is also distinct and suggest that this remodeling in dauers provides a template for the subsequent establishment of adult post-dauer profiles. (omicsdi.org)
  • over the course of evolution, differential selection pressures throughout the lifetime produced distinct larval and juvenile/adult periods. (springer.com)
  • morphological
  • The morphological pattern of the larval lamprey brain has also been described subsequent to the classical analyses of Bergquist, in which five prosomeres were counted ( Bergquist and Källén, 1953 ). (biologists.org)
  • Biologists
  • When the calls started coming into the Alaska Department of Fish and Game last summer, biologists surmised that the fish had fallen out of the mouths of hungry birds taking advantage of a swarm of lampreys returning to the Chena River to lay their eggs. (uaf.edu)
  • females
  • Whole body analysis of the injected lampreys showed that total residue concentrations decreased to 4.65 in males and 10.07 in females during the first day after injection, and to 1.46 in males and 3.74 in females after 10 days of withdrawal. (usgs.gov)
  • Adult females can release up to 100,000 eggs at a time. (uaf.edu)
  • As part of courtship, male sea lampreys rub a ridge of back tissue against females' abdomens. (wikipedia.org)
  • Male silver lamprey did not release 3kPZS at rates sufficient to be detected by females in natural high-volume stream environments. (royalsocietypublishing.org)
  • specimens
  • These specimens were donated to the University of Alaska Museum of the North, where Curator Andres Lopez was already involved with several projects involving lampreys. (uaf.edu)
  • One of the lamprey specimens in the collections at the University of Alaska Museum of the North used in research. (uaf.edu)
  • upstream
  • In Britain, at the time of the Conquest , lampreys were found as far upstream in the River Thames as Petersham [ citation needed ] . (wikipedia.org)
  • synaptic
  • Here, we have used immunogold electron microscopy to examine the subcellular localization of actin and synapsin in the giant synapse in lamprey at different states of synaptic activity. (rupress.org)
  • To gain insight into the synaptic role of talin, we microinjected into the large lamprey axons reagents that compete the talin-PIP kinase interaction and then examined their effects on synaptic structure. (rupress.org)
  • swim
  • The proposed changes are designed to attract more adults into the trap, and to entice lampreys to swim through the pipe to the hatchery. (glfc.org)
  • They spread the lampricide in streams in the spring, to kill some of the young lamprey as they swim down into the lake. (publicradio.org)
  • fins
  • Lacking paired fins , adult lampreys have large eyes, one nostril on the top of the head, and seven gill pores on each side of the head. (wikipedia.org)
  • Although lampreys lack paired lateral fins, they are efficient swimmers, propelling themselves through the water using an undulating wave motion that propagates rostro-caudally (Grillner, McClellan, Sigvardt, Wallen, & Wilen, 1981 ). (oxfordre.com)
  • nostril
  • Lampreys have 7 paired gills, a large eye on either side of the head, and a single nostril on the dorsal surface of the head. (oxfordre.com)
  • Metamorphosis
  • Each period required the dramatically different morphologies seen in modern lampreys, ultimately requiring a true metamorphosis to accommodate the large changes in the body plan and to maximize the efficiency of each life period. (springer.com)
  • The central nervous system of the pouched lamprey develops notably during metamorphosis to the large-eyed macropthalmia stage, with particularly large increases in the volume of visual areas of the brain. (wikipedia.org)
  • Control
  • We deep-sequenced small RNA libraries from 2 biological replicates each of control and postdauer adults, and one biological each of larval L3 and dauer stages. (omicsdi.org)
  • Active control programs to control lampreys are undergoing modifications due to concerns of drinking water quality in some areas. (wikipedia.org)
  • Charge is to develop a strategy for sustainable sea lamprey control on the St. Marys River that includes an integrated program of options that minimize costs and environmental impacts, while maximizing suppression of transformer production from the river over the long term. (glfc.org)
  • The information gathered will be used to determine the need for sea lamprey control. (dailytribune.com)
  • thyroid
  • The thyroid weighs 25 grams in adults, with each lobe being about 5 cm long, 3 cm wide and 2 cm thick, and the isthmus about 1.25 cm in height and width. (wikipedia.org)
  • rasp
  • Sea lampreys attach to fish with a suction cup mouth, rasp a hole though the fish s scales and skin, and feed on blood and body fluids. (dailytribune.com)
  • lineage
  • Lampreys belong to a lineage of jawless fishes with teeth arranged into a funnel-like spiral adapted to help the animals attach to their prey. (uaf.edu)
  • Assessment
  • A U.S. Fish and Wildlife Service assessment crew will conduct work on the Clinton River in Macomb County during May 14 to June 10 to estimate the abundance of lampreys offshore of the Clinton River. (dailytribune.com)
  • large
  • While lampreys aren't a large-scale commercial resource, they are a subsistence species and play a vital role in maintaining the health of aquatic ecosystems. (uaf.edu)
  • The skull of lampreys (middle) has a more elaborate braincase and comprises a large 'branchial basket' surrounding the gills. (tolweb.org)