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Robert H. Devlin - One of the best experts on this subject based on the ideXlab platform.
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upper thermal tolerance of wild type domesticated and growth hormone transgenic coho salmon Oncorhynchus kisutch
Journal of Fish Biology, 2015Co-Authors: Zhongqi Chen, Robert H. Devlin, Anthony P FarrellAbstract:In coho salmon Oncorhynchus kisutch, no significant differences in critical thermal maximum (c. 26·9° C, CTmax ) were observed among size-matched wild-type, domesticated, growth hormone (GH)-transgenic fish fed to satiation, and GH-transgenic fish on a ration-restricted diet. Instead, GH-transgenic fish fed to satiation had significantly higher maximum heart rate and Arrhenius breakpoint temperature (mean ± s.e. = 17·3 ± 0·1° C, TAB ). These results provide insight into effects of modified growth rate on temperature tolerance in salmonids, and can be used to assess the potential ecological consequences of GH-transgenic fishes should they enter natural environments with temperatures near their thermal tolerance limits.
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sperm characteristics and fertilization success of masculinized coho salmon Oncorhynchus kisutch
Aquaculture, 2005Co-Authors: John L Fitzpatrick, J C Henry, N R Liley, Robert H. DevlinAbstract:Endocrine technologies and sex modification of fish stocks are playing an increasingly important role in commercial aquaculture production. The characteristics and fertilization success of sperm from masculinized coho salmon (Oncorhynchus kisutch) were examined and compared to that of regular coho salmon sperm. Sperm from masculinized XX males was stripped, or when the efferent ducts were not developed the semen was collected from the testis, and compared with semen from normal XY males. Stripped masculinized genetic females exhibited similar measures of sperm velocity and sperm density as normal male coho salmon, with both of these groups differing significantly from testicular sperm from masculinized females. In commercial fertilization trials, fertilization success was not altered by the dichotomy observed between testicular and stripped milt from masculinized females. Treatment with leutenizing hormone releasing analogues had no effect on sperm motility, density, or fertility. Much of the difference in sperm characteristics can be attributed to the difference between stripped sperm and testicular sperm.
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Detection of a genetic alteration and species identification of coho salmon ( Oncorhynchus kisutch ): a collaborative study
European Food Research and Technology, 2002Co-Authors: Hartmut Rehbein, Robert H. Devlin, Hermann RüggebergAbstract:A PCR-based method for the identification of genetically modified coho salmon (Oncorhynchus kisutch) has been developed and evaluated by a collaborative study. The coho salmon contained an "all-salmon" gene-construct (OnMTGH1) consisting of the metallothionein-B-promoter fused to the full-length type-1 growth hormone gene, both from sockeye salmon (Oncorhynchus nerka).
Patrick Prunet - One of the best experts on this subject based on the ideXlab platform.
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Plasma prolactin and cortisol concentrations of stressed coho salmon Oncorhynchus kisutch in freshwater or saltwater
General and Comparative Endocrinology, 1991Co-Authors: M. Avella, C.b. Schreck, Patrick PrunetAbstract:Juvenile coho salmon, Oncorhynchus kisutch, adapted to fresh water or seawater were either acutely handled or continuously stressed by severe confinement. Chronic stress, independent of external salinity, caused a gradual increase in the concentration of circulating prolactin that persisted for 1 to 5 days but lagged behind the cortisol response which peaked much more rapidly and remained elevated. Acutely stressed fish showed a rapid, more transient increase in plasma cortisol titer with no apparent effect on prolactin. Confinement appeared to be more stressful to fish in salt water than to those in fresh water, as judged by their sodium regulatory ability, hormone profiles, and mortality. Stress always elevated plasma prolactin concentrations, regardless of medium or developmental stage.
M. Avella - One of the best experts on this subject based on the ideXlab platform.
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Plasma prolactin and cortisol concentrations of stressed coho salmon Oncorhynchus kisutch in freshwater or saltwater
General and Comparative Endocrinology, 1991Co-Authors: M. Avella, C.b. Schreck, Patrick PrunetAbstract:Juvenile coho salmon, Oncorhynchus kisutch, adapted to fresh water or seawater were either acutely handled or continuously stressed by severe confinement. Chronic stress, independent of external salinity, caused a gradual increase in the concentration of circulating prolactin that persisted for 1 to 5 days but lagged behind the cortisol response which peaked much more rapidly and remained elevated. Acutely stressed fish showed a rapid, more transient increase in plasma cortisol titer with no apparent effect on prolactin. Confinement appeared to be more stressful to fish in salt water than to those in fresh water, as judged by their sodium regulatory ability, hormone profiles, and mortality. Stress always elevated plasma prolactin concentrations, regardless of medium or developmental stage.
Scott G Hinch - One of the best experts on this subject based on the ideXlab platform.
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acute effects of suspended sediment angularity on juvenile coho salmon Oncorhynchus kisutch
Canadian Journal of Fisheries and Aquatic Sciences, 1999Co-Authors: Randal G Lake, Scott G HinchAbstract:To determine the roles of suspended sediment angularity and concentration as contributors to stress and mortality in salmonids, we exposed juvenile coho salmon (Oncorhynchus kisutch) to anthropogenically derived "extremely angular" and "round" silicate sediments over a range of concentrations in 96-h experiments. Stress responses (e.g., decreased leukocrit) were elicited by exposure to both sediment shapes when concentrations were >40 g·L -1 , corresponding to the minimum concentration at which physical gill damage was observed. Extremely angular sediments also caused stress responses (e.g., elevated hematocrit, decreased leukocrit) at concentrations <41 g·L -1 . However, we found no difference between sediment shapes in causing mortality at any sediment concentration. Further, mortalities were not observed until concentrations were about 100 g·L -1 , a value that is about an order of magnitude greater than high natural concentrations in salmonid rivers. Natural fluvial suspended sediments cause fish stress and mortality at much lower concentrations than we found with our anthropogenically derived suspended sediments. Resume : Pour determiner les effets de l'angularite et de la concentration des sediments en suspension en tant qu'agents de stress et facteurs de mortalite chez les salmonides, nous avons expose des saumons cohos (Oncorhynchus kisutch) juveniles a des sediments de silicate d'origine anthropique « extremement anguleux » et « arrondi s»ad es concentrations diverses dans des essais de 96 h. Un stress (p. ex., reduction du leucocrite) a ete induit par l'exposition aux deux types de sediments quand leurs concentrations etaient superieures a 40 g·L -1 , concentration minimale a laquelle des dommages physiques aux branchies ont ete observes. Les sediments extremement anguleux ont aussi cause un stress (p. ex., hematocrite eleve, leucocrite reduit) aux concentrations inferieures a 41 g·L -1 . Cependant, les sediments des deux types, a quelque concentration que ce soit, ne causaient pas une mortalite plus elevee l'un que l'autre. De plus, pour qu'il y ait mortalite, il fallait que les concentrations atteignent environ 100 g·L -1 , soit une valeur environ dix fois superieure aux concentrations naturelles elevees observees dans les rivieres a saumon. Les sediments naturels en suspension dans les cours d'eau causent un stress et peuvent tuer des poissons a des concentrations beaucoup plus faibles que celles des sediments en suspension d'origine anthropique utilises dans nos essais. (Traduit par la Redaction) Lake and Hinch 867
S. H. Hayduk - One of the best experts on this subject based on the ideXlab platform.
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Experimental Hexamitiasis in Juvenile Coho Salmon (Oncorhynchus kisutch) and Steelhead Trout (Salmo gairdneri)
Transactions of The American Fisheries Society, 2011Co-Authors: Joseph R. Uzmann, G. J. Paulik, S. H. HaydukAbstract:Abstract An exogenous strain of cultured Hexamita salmonis (Moore) was employed to induce trophic hexamitiasis in otherwise disease-free juveniles of coho salmon (Oncorhynchus kisutch) and steelhead trout (Salmo gairdneri). Mortality and growth were the parameters used to detect the effects of hexamitiasis on the two species. Two levels of each of the three experimental factors under study, Hexamita infection, species of fish, and density of fish, were arranged in a three-way factorial design. Replicate lots involved a total of 1,440 fish held under controlled laboratory conditions. Comparisons of growth and mortality indicate that infection with H. salmonis over a period of 8 weeks is innocuous to coho salmon. Steelhead trout suffered a low, but statistically significant mortality which subsided after the sixth week; growth rate was not affected.
