Relating capture and physiological conditions to viability and survival of Pacific halibut discarded from commercial longline gear

Dykstra, C.L.; Wolf, N.; Harris, B.; Stewart, I.J.; Hicks, A.C.; Restrepo, F.; Planas, J.V.

doi:10.1016/j.ocecoaman.2024.107018

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Relating capture and physiological conditions to viability and survival of Pacific halibut discarded from commercial longline gear

2024
By Dykstra, C.L. ; Wolf, N. ; Harris, B. ; ...
Source: Ocean and Coastal Management 249 (2024) 107018

[PDF-4.62 MB]

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Details:

Journal Title:

Ocean and Coastal Management
Personal Author:

Dykstra, C.L. ; Wolf, N. ; Harris, B. ; Stewart, I.J. ; Hicks, A.C. ; ... More +

Dykstra, C.L. ; Wolf, N. ; Harris, B. ; Stewart, I.J. ; Hicks, A.C. ; Restrepo, F. ; Planas, J.V. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service)
Description:

Mortality of fish discarded from commercial fisheries is often estimated by using viability keys to parse fish into different categories with unique estimated survival outcomes. In this study we examined the relationships of environmental and physiological parameters and viability classifications of Pacific halibut (Hippoglossus stenolepis) released from commercial longline gear using three distinct hook-release methods. Our results indicate that the hook release method used strongly influenced viability, with careful shake and gangion cut resulting in minimal injuries leading to discarded fish characterized as having excellent viability. In contrast hook stripping resulted in most released fish having moderate or poor viability. Physiological parameters (lactate, hematocrit) were strong indicators of Pacific halibut assigned to the dead viability category. In addition to being captured at greater depth and lower sea bottom temperature, dead categorized fish were associated with high plasma lactate levels and lower hematocrit, attributed to sand flea intrusion. Reducing the use of hook strippers and limiting soak times in areas of known sand flea activity are likely to improve viability outcomes of Pacific halibut released from commercial longline gear. Discard survival and understanding of the factors affecting it remain critical to successful long-term management of Pacific halibut, as sustainable fishing levels are adjusted yearly for estimated mortality consistent with recent fishing discards.
Keywords:

[+]

Fishery Management Pacific Halibut Condition Discard Mortality Hippoglossus Stenolepis Hook Release Stress Indicators
Source:

Ocean and Coastal Management 249 (2024) 107018
DOI:

https://doi.org/10.1016/j.ocecoaman.2024.107018
Format:

PDF
Document Type:

Journal Article
Funding:

Grant no. NA17NMF4270240
License:

https://creativecommons.org/licenses/by-nc/4.0/
Rights Information:

CC BY-NC
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Submitted
Main Document Checksum:

[+]

urn:sha256:607f143990d124b5a57f8a412b5392a2011a4db33e7d6b695b403d981d80b69e
Download URL:

https://repository.library.noaa.gov/view/noaa/56752/noaa_56752_DS1.pdf
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