The Proportional Migration Selective Fishery Model

Lawson, Peter W.; Comstock, Richard

doi:10.1201/9780429104411-33

Sustainable Fisheries Management 2020

DOI: 10.1201/9780429104411-33

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The Proportional Migration Selective Fishery Model

Peter W. Lawson¹,

Richard Comstock²

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2020

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Cited by 2 publications

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“…Specifically, our objectives were to estimate and compare immediate and postrelease bycatch mortality rates of wild Sockeye Salmon and Coho Salmon from the modified fish trap design relative to results from the prototype trap and other previously tested commercial gears through paired release-recapture and a net-pen holding methodology (Vander Haegen et al 2004;WDFW 2014;Takata and Johnson 2018;Tuohy et al 2019). This information may be used by resource management agencies and fishers coastwide to assess the utility of alternative commercial gear to increase sustainable fishing opportunities, enable selective harvest in terminal river locations, and minimize bycatch mortality for wild salmonid recovery Lawson and Comstock 2000).…”

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confidence: 99%

Modified Commercial Fish Trap to Help Eliminate Salmonid Bycatch Mortality

Tuohy

Skalski

Jorgenson

2020

N American J Fish Manag

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The utility of commercial salmonid Oncorhynchus spp. traps in the U.S. Pacific Northwest was recently revisited for the first time in decades to enable selective harvesting of hatchery-origin salmonids while reducing mortality of Endangered Species Act (ESA)-listed salmonids. Modifications to historical gear designs resulted in dramatic improvements in salmonid bycatch survival rates relative to conventional commercial gears in the lower Columbia River. Expanding upon this work, an experimental commercial fish trap was further modified to largely eliminate net contact, air exposure, handling, and crowding of fish. Studies were conducted from May to November 2019 in the lower Columbia River to estimate survival of bycatch and evaluate potential benefits from the modified passive capture design. Analyzed through two separate survival estimation techniques, the modified trap demonstrated no detectable effect on salmon release survival and a significant improvement over the previous prototype design. Estimated through a paired release-recapture methodology, the relative survival effect of catch and release compared to controls over a 400-km migration was 1.017 (bSE = 0.032) for adult Sockeye Salmon O. nerka. For adult Coho Salmon O. kisutch that were held captive for a 48-h postrelease period, estimated survival (S) was 1.000 (lower 95% confidence limit: S ≥ 0.978). These results suggest that trap modifications can be made to significantly reduce bycatch mortality of ESA-listed salmonids and provide increased opportunity for harvest of hatchery-origin salmonids. Many wild salmonid Oncorhynchus spp. evolutionarily significant units in the Columbia River basin of the U.S. Pacific Northwest are currently listed as threatened or endangered under the Endangered Species Act (ESA) and remain in decline as a result of harvest impacts, habitat loss, hatcheries, and climate change (Nehlsen et al. 1991; Lichatowich 1999; NWFSC 2015; Crozier 2016). This includes 13 evolutionarily significant units of wild-origin steelhead O. mykiss (anadromous Rainbow Trout), Chinook Salmon O. tshawytscha, Coho Salmon O. kisutch, Chum Salmon O. keta, and Sockeye Salmon O. nerka (NWFSC 2015). Hatchery production of salmonids is used

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confidence: 99%

Modified Commercial Fish Trap to Help Eliminate Salmonid Bycatch Mortality

Tuohy

Skalski

Jorgenson

2020

N American J Fish Manag

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Uncertainties in Estimating Fishing Mortality in Unmarked Salmon in Mark-Selective Fisheries Using Double-Index-Tagging Methods

Zhou

2002

North American Journal of Fisheries Management

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Mass marking of hatchery salmon and selective fisheries on these marked fish are being implemented in the northeastern Pacific Ocean. The potential impact of this management practice on current coded wire tag (CWT) programs has become a vital concern. Methods have been developed to maintain the viability of the current CWT programs by using double index tags (DITs). This study uses Monte Carlo simulations to examine uncertainty in estimating fishing mortality of unmarked coho salmon Oncorhynchus kisutch based on the DIT method. Variables used in the simulation include marine survival rate, encounter rate, hook-and-release mortality rate, precision in catch and escapement sampling, and harvest rate in nonselective fisheries. Results show that random variability in these variables creates significant uncertainty in the estimates. Typically, the 90% confidence interval of the estimated fishing mortality rate may take any value from below zero to more than double the true value. The precision of estimated fishing impacts on unmarked salmon cannot be maintained at the level for marked salmon by using the DIT method.*

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The Proportional Migration Selective Fishery Model

Cited by 2 publications

References 1 publication

Modified Commercial Fish Trap to Help Eliminate Salmonid Bycatch Mortality

Modified Commercial Fish Trap to Help Eliminate Salmonid Bycatch Mortality

Uncertainties in Estimating Fishing Mortality in Unmarked Salmon in Mark-Selective Fisheries Using Double-Index-Tagging Methods

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