The Experts below are selected from a list of 5115 Experts worldwide ranked by ideXlab platform
Joseph L Wooden - One of the best experts on this subject based on the ideXlab platform.
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migration and rearing histories of chinook salmon Oncorhynchus tshawytscha determined by ion microprobe sr isotope and sr ca transects of otoliths
Canadian Journal of Fisheries and Aquatic Sciences, 2004Co-Authors: Charles R Bacon, P K Weber, Kimberly Larsen, Reginald R Reisenbichler, John A Fitzpatrick, Joseph L WoodenAbstract:Strontium isotope and Sr/Ca ratios measured in situ by ion microprobe along radial transects of otoliths of juvenile chinook salmon (Oncorhynchus tshawytscha) vary between watersheds with contrasti...
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migration and rearing histories of chinook salmon Oncorhynchus tshawytscha determined by ion microprobe sr isotope and sr ca transects of otoliths
Canadian Journal of Fisheries and Aquatic Sciences, 2004Co-Authors: Charles R Bacon, P K Weber, Kimberly Larsen, Reginald R Reisenbichler, John A Fitzpatrick, Joseph L WoodenAbstract:Strontium isotope and Sr/Ca ratios measured in situ by ion microprobe along radial transects of otoliths of juvenile chinook salmon (Oncorhynchus tshawytscha) vary between watersheds with contrasting geology. Otoliths from ocean-type chinook from Skagit River estuary, Washington, had prehatch regions with 87Sr/86Sr ratios of ~0.709, suggesting a maternally inherited marine signature, extensive fresh water growth zones with 87Sr/86Sr ratios similar to those of the Skagit River at ~0.705, and marine-like 87Sr/86Sr ratios near their edges. Otoliths from stream-type chinook from central Idaho had prehatch 87Sr/86Sr ratios ≥0.711, indicating that a maternal marine Sr isotopic signature is not preserved after the ~1000- to 1400-km migration from the Pacific Ocean. 87Sr/86Sr ratios in the outer portions of otoliths from these Idaho juveniles were similar to those of their respective streams (~0.7080.722). For Skagit juveniles, fresh water growth was marked by small decreases in otolith Sr/Ca, with increases in ...
George K Iwama - One of the best experts on this subject based on the ideXlab platform.
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the effects of feeding level and rearing density on the prevalence of renibacterium salmoninarum in chinook salmon Oncorhynchus tshawytscha reared in salt water
Aquaculture, 1993Co-Authors: Carl F Mazur, Donald Tillapaugh, George K IwamaAbstract:Abstract This study investigated the effects of feeding level and rearing density on the prevalence of Renibacterium salmoninarum , the causative agent of bacterial kidney disease (BKD), in chinook salmon ( Oncorhynchus tshawytscha ) transferred to salt water in June 1988 and reared for 272 days. The fish were sampled four times and whole kidneys analyzed for the presence of R. salmoninarum . Three percent of the fish sampled at the freshwater hatchery were infected with R. salmoninarum . The bacterium was not detected in any of the fish sampled 69 and 171 days after transfer to salt water. Fish sampled 263 days after transfer to salt water had infection rates which were directly proportional to rearing densities in the range 1.5 to 4 kg m −3 .
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effects of salinity on growth metabolism and ion regulation in juvenile rainbow and steelhead trout Oncorhynchus mykiss and fall chinook salmon Oncorhynchus tshawytscha
Canadian Journal of Fisheries and Aquatic Sciences, 1991Co-Authors: John D Morgan, George K IwamaAbstract:Rainbow and steelhead trout (Oncorhynchus mykiss) and fall chinook salmon (Oncorhynchus tshawytscha) fry were acclimated to a range of salinities to test the hypothesis that the energy requirements...
Charles R Bacon - One of the best experts on this subject based on the ideXlab platform.
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migration and rearing histories of chinook salmon Oncorhynchus tshawytscha determined by ion microprobe sr isotope and sr ca transects of otoliths
Canadian Journal of Fisheries and Aquatic Sciences, 2004Co-Authors: Charles R Bacon, P K Weber, Kimberly Larsen, Reginald R Reisenbichler, John A Fitzpatrick, Joseph L WoodenAbstract:Strontium isotope and Sr/Ca ratios measured in situ by ion microprobe along radial transects of otoliths of juvenile chinook salmon (Oncorhynchus tshawytscha) vary between watersheds with contrasti...
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migration and rearing histories of chinook salmon Oncorhynchus tshawytscha determined by ion microprobe sr isotope and sr ca transects of otoliths
Canadian Journal of Fisheries and Aquatic Sciences, 2004Co-Authors: Charles R Bacon, P K Weber, Kimberly Larsen, Reginald R Reisenbichler, John A Fitzpatrick, Joseph L WoodenAbstract:Strontium isotope and Sr/Ca ratios measured in situ by ion microprobe along radial transects of otoliths of juvenile chinook salmon (Oncorhynchus tshawytscha) vary between watersheds with contrasting geology. Otoliths from ocean-type chinook from Skagit River estuary, Washington, had prehatch regions with 87Sr/86Sr ratios of ~0.709, suggesting a maternally inherited marine signature, extensive fresh water growth zones with 87Sr/86Sr ratios similar to those of the Skagit River at ~0.705, and marine-like 87Sr/86Sr ratios near their edges. Otoliths from stream-type chinook from central Idaho had prehatch 87Sr/86Sr ratios ≥0.711, indicating that a maternal marine Sr isotopic signature is not preserved after the ~1000- to 1400-km migration from the Pacific Ocean. 87Sr/86Sr ratios in the outer portions of otoliths from these Idaho juveniles were similar to those of their respective streams (~0.7080.722). For Skagit juveniles, fresh water growth was marked by small decreases in otolith Sr/Ca, with increases in ...
Todd N Pearsons - One of the best experts on this subject based on the ideXlab platform.
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factors influencing the relative fitness of hatchery and wild spring chinook salmon Oncorhynchus tshawytscha in the wenatchee river washington usa
Canadian Journal of Fisheries and Aquatic Sciences, 2010Co-Authors: Kevin S Williamson, Todd N Pearsons, Andrew R Murdoch, Eric J Ward, Michael J FordAbstract:Understanding the relative fitness of naturally spawning hatchery fish compared with wild fish has become an important issue in the management and conservation of salmonids. We used a DNA-based parentage analysis to measure the relative reproductive success of hatchery- and natural-origin spring Chinook salmon (Oncorhynchus tshawytscha) in the natural environment. Size and age had a large influence on male fitness, with larger and older males producing more offspring than smaller or younger individuals. Size had a significant effect on female fitness, but the effect was smaller than on male fitness. For both sexes, run time had a smaller but still significant effect on fitness, with earlier returning fish favored. Spawning location within the river had a significant effect on fitness for both sexes. Hatchery-origin fish produced about half the juvenile progeny per parent when spawning naturally than did natural-origin fish. Hatchery fish tended to be younger and return to lower areas of the watershed than...
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the effects of hatchery domestication on competitive dominance of juvenile spring chinook salmon Oncorhynchus tshawytscha
Canadian Journal of Fisheries and Aquatic Sciences, 2007Co-Authors: Todd N Pearsons, Anthony L Fritts, Jennifer L ScottAbstract:We tested the null hypotheses that competitive dominance among juvenile Chinook salmon (Oncorhynchus tshawytscha) in contest and scramble experiments would not be affected by domestication selection after one generation of state-of-the-art hatchery culture. Dyadic challenges of size-matched juvenile fish were conducted after a 6-day accli- mation in 113.4 L aquaria. Differences in dominance and frequency of different types of agonistic interactions used were not significantly different in contest (n = 505) or scramble (n = 363) competition experiments (P > 0.05). How- ever, wild origin fish were more aggressive than hatchery origin fish in both types of experiments (P ≤ 0.05). Further- more, wild origin fish gained more weight than hatchery origin fish during contest experiments, and hatchery origin fish lost less weight than wild origin fish in scramble experiments (P ≤ 0.05). Dominant fish, regardless of origin, grew more than subordinate fish in both contest and scramble experiments (P ≤ 0.05). Our results indicate that aggression, and growth mediated by competition, can be affected by domestication after only one generation of state-of-the-art hatchery culture; however, impacts to competitive dominance appear to be small.
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the effects of domestication on the relative vulnerability of hatchery and wild origin spring chinook salmon Oncorhynchus tshawytscha to predation
Canadian Journal of Fisheries and Aquatic Sciences, 2007Co-Authors: Anthony L Fritts, Jennifer L Scott, Todd N PearsonsAbstract:We tested whether one generation of state-of-the-art hatchery culture influenced the vulnerability of Chinook salmon (Oncorhynchus tshawytscha) fry to predators. Size-matched hatchery and wild origin spring Chinook salmon fry were exposed to rainbow trout (Oncorhynchus mykiss) and torrent sculpin (Cottus rhotheus) predators in 10.8 m3 net pens. The hatchery origin fry were the offspring of first generation hatchery-reared broodstock, and the wild origin fry had no history of hatchery culture; both originated from the same stock. Wild origin fry were found to have a 2.2% (p = 0.016) survival advantage over hatchery origin fry during 2 years of predation challenges. The most important findings of this study are (i) domestication can affect the susceptibility to predators after only one generation of state-of-the-art hatchery culture practices, and (ii) the domestication effect was very small.
W Seeblisa - One of the best experts on this subject based on the ideXlab platform.
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single nucleotide polymorphisms reveal distribution and migration of chinook salmon Oncorhynchus tshawytscha in the bering sea and north pacific ocean
Canadian Journal of Fisheries and Aquatic Sciences, 2013Co-Authors: A Larsonwesley, M Utterfred, W Myerskatherine, D Templinwilliam, E Seebjames, Guthrie M Iiicharles, V Bugaevalexander, W SeeblisaAbstract:We genotyped Chinook salmon (Oncorhynchus tshawytscha) from the Bering Sea and North Pacific Ocean for 43 single-nucleotide polymorphisms (SNPs) to investigate seasonal distribution and migration p...
