An Evaluation of the Selective Breeding of Steelhead Trout (Salmo Gairdneri Gairdneri) and Coho Salmon (Oncorhynchus Kisutch) at Eagle Creek National Fish Hatchery, Oregon PDF Download
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Author: Dennis Dale Roley
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 396
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Author: Dennis Dale Roley
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 396
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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 166
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Author: University of Washington. College of Fisheries
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 556
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Author: Leo Shapovalov
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 402
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Author: Howard F. Horton
Publisher:
ISBN:
Category : Coho
Languages : en
Pages : 68
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Author: Frederick Charles Cleaver
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 36
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Author: Reginald Ruben Reisenbichler
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 70
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Relative growth and survival of offspring from matings of hatchery and wild Deschutes River (Oregon) summer steelhead trout, Salmo gairdneri, were monitored to determine if hatchery fish differ genetically from wild fish in traits which can affect the stock-recruitment relationship of wild populations. Four natural streams and a hatchery pond were each stocked with genetically marked eyed-eggs or unfed fry from each of three matings: hatchery x hatchery (HH), hatchery x wild (HW) and wild x wild (WW). In the hatchery pond, HH fish exhibited the greatest survival and were larger than fish in the other groups. WW fish had the greatest survival and HW fish were largest in streams where there were significant differences in survival or length. The hatchery fish were genetically different from wild fish and can have an adverse effect on the stock-recruitment relationship of the wild population when they interbreed with wild fish. Hatchery procedures can be modified to lessen this effect by minimizing the genetic differences between hatchery and wild fish.
Author: Glen F. Bieber
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 78
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The objectives of this study were to determine whether changes in the selective pressures which occur in a hatchery could cause inherited modifications in the behavior of steelhead trout (Salmo gairdneri) that would affect their survival in the wild. Environmental effects on the behavior of the offspring of hatchery and wild adults were eliminated by raising the fish in a hatchery under identical conditions. Wild alevins survived better than hatchery alevins in artificial redds. The hatchery and wild alevins maintained similar positions in a rearing tank and had similar feeding behavior. Studies with an artificial stream channel indicated that hatchery fry were more aggressive, more attracted to cover, and may have had smaller territory requirements than wild fry. These modifications in the behavior of hatchery steelhead trout could affect their densities in streams. By raising fish in a more natural environment, genetic changes in the wild population may be minimized.
Author: James T. Martin
Publisher:
ISBN:
Category : Salmon
Languages : en
Pages : 64
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Efforts to manage stocks of salmonids in Pacific Northwest stream systems are complicated by the occurrence of several runs of a species thought to represent races rearing sympatrically as juveniles. In order to collect the population statistics needed to properly manage these stocks, managers need a method of identifying juvenile salmonids by race. In an effort to determine if taxonomic or morphological differences exist between these races, wild juvenile summer and winter steelhead trout (Salmo gairdneri) and wild juvenile spring and fall chinook salmon (Oncorhynchus tshawytscha) from the Rogue River (Oregon) were studied. The goal of the study was to determine if differences in taxonomic characters would allow racial identification of individual fish with 90% accuracy. The wild juvenile summer steelhead trout had significantly fewer vertebrae and larger nuclei, greater average intracircular spacing, and a larger length at first annulus formation of scales than winter steelhead trout. No differences between juvenile summer and winter steelhead trout were found in otolith nuclear diameter, total lipids or fatty acid composition of the muscle tissue. Wild juvenile spring chinook salmon exhibited significantly lower vertebral counts, larger otolith nuclear diameter, greater average intracircular spacing, larger scale nuclei, and a larger first and second band of five intracircular spaces than juvenile fall chinook salmon. Mesentary fat deposition was highly variable between fish from the same streams and was not useful in separating juveniles by race. Although significant differences between races were found for both species, none of these differences were sufficient to allow the racial identification of individual fish with 90% accuracy. It is not known if the differences found were caused by genetic or environmental effects or both. One experiment showed that summer and winter steelhead showed no difference in vertebrae or otolith dimensions when incubated under the same conditions, suggesting that differences found in wild steelhead trout were caused by environmental effects. The lack of distinct phenotypic differences between individual fish of different races may be caused by extensive interbreeding between races of salmonids in the Rogue Basin due to large environmental variability during the spawning season for chinook salmon and steelhead trout. It is also possible that environmental variation in the early life history masked genetic differences between the races.
Author: G. F. Hartman
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 47
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