A Review of Hooking Mortality of Coho (Oncorhynchus Kisutch) and Chinook (O. Tshawytscha) Salmon and Steelhead Trout (Salmo Gairdneri) PDF Download
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Author: Howard F. Horton
Publisher:
ISBN:
Category : Coho
Languages : en
Pages : 68
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Book Description
Author: Howard F. Horton
Publisher:
ISBN:
Category : Coho
Languages : en
Pages : 68
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Book Description
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 146
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Book Description
Includes abstracts of some reports
Author: Washington (State). Department of Fisheries
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 22
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Book Description
Author:
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 450
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Book Description
Author: J. R. Uzmann
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 12
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Book Description
Author: Steven Frank Cox-Rogers
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 16
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Book Description
Author: Anita J. M. Stohr
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 91
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Book Description
Author: Adrian McFarland Tuohy
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Book Description
Gillnets and other conventional harvest techniques utilized in mixed-stock commercial salmon fisheries frequently result in bycatch mortality. In many parts of the U.S Pacific Northwest, bycatch and hatchery impacts impede the recovery of Endangered Species Act (ESA)-listed salmonids and constrain commercial fishing opportunities. For the benefit of wild salmon, threatened ecosystems, and coastal fishing communities, a post-release survival study was conducted on the lower Columbia River to evaluate the potential of an alternative commercial gear—an experimental pound net trap—as a live-capture, stock-selective harvest technique. Expanding upon a 2016 pilot study, a modified trap was constructed and operated under a variety of tidal stages, light levels, and weather conditions between August 26 and September 27, 2017. Utilizing a paired mark-release-recapture procedure with Passive Integrated Transponder (PIT) tags, post-release survival from the trap was estimated through the Cormack-Jolly-Seber method; catch-per-unit-effort (CPUE) and covariates of CPUE were analyzed through Generalized Linear Models (GLM). Results demonstrated that pound net traps can effectively target commercially viable quantities of hatchery reared fall Chinook (Oncorhynchus tshawytscha) and coho salmon (O. kisutch) while reducing cumulative bycatch mortality of ESA-listed species relative to conventional and alternative commercial gears. During the study period, 7,129 salmonids were captured and released. The ratio of wild to hatchery-origin salmonids captured was approximately 1:3. Cumulative survival to McNary Dam ranged from 94.4% for steelhead trout (O. mykiss) to 99.5% for Chinook salmon, warranting application of the gear as a stock-selective harvest tool in commercial salmon fisheries.
Author: Robert L. Hite
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 182
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Book Description
Author: Denise A. Kelsey
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 0
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Book Description
Three experiments were designed to determine if and how steelhead trout, Oncorhynchus mykiss, may affect chinook salmon, O. tshawytscha, when they are confined together as in a raceway or on a barge. We observed groups of chinook and steelhead together and groups of only chinook in a behavioral experiment to determine if steelhead are aggressive and if their presence changed the behavior of chinook. Two physiological experiments were completed to determine if the loading of steelhead on top of chinook and if the introduction of odor from rainbow trout (steelhead not available) caused a change in plasma cortisol levels in chinook. It was found that chinook showed characteristics of a schooling species, while steelhead exhibited territory holding characteristics. Behavioral changes in chinook were observed when steelhead were present. Chinook grouped with steelhead reduced their movements, darted less, were attacked up to 16 times more often, and were found less frequently in the shade than groups of only chinook. Steelhead were found to establish territories and defend them with chases, charges, and nips. In attempts to establish territories and defend them, steelhead attacked chinook as often as they attacked other steelhead even though chinook showed little aggression toward steelhead. In a physiological experiment, chinook experienced the loading of salmonids into their tank. Chinook had higher levels of plasma cortisol at 2 and 32 hours after the loading of steelhead than chinook that were loaded with chinook or controls (no loading). A second physiological experiment with odor showed that chinook that received rainbow odor and those that received chinook odor had similar levels of plasma cortisol. Cortisol levels (two hours after the odor was introduced) were higher in chinook receiving either of the scented waters than in those that did not receive any odor. In conclusion, all three experiments indicated that the presence of juvenile steelhead trout affect juvenile chinook salmon behavior and physiology.
