Quantifying post release mortality rates of sharks incidentally captured in Pacific tuna longline fisheries and identifying handling practices to improve survivorship

Hutchinson, Melanie; Bigelow, Keith

doi:10.25923/2sxy-s659

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Quantifying post release mortality rates of sharks incidentally captured in Pacific tuna longline fisheries and identifying handling practices to improve survivorship

[PDF-629.18 KB]

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Personal Author:

Hutchinson, Melanie ; Bigelow, Keith

Hutchinson, Melanie ; Bigelow, Keith Less -
Corporate Authors:

Pacific Islands Fisheries Science Center (U.S.)
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; PIFSC (Pacific Islands Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; PIFSC (Pacific Islands Fisheries Science Center) Less -
Description:

Shark bycatch rates are higher in pelagic longline fisheries than in any other fishery, and these sharks are typically discarded at sea. The post-release fate of discarded sharks is largely unobserved and could pose a significant source of unquantified mortality. This study assessed post release mortality rates of blue (Prionace glauca), bigeye thresher (Alopias superciliosus), oceanic whitetip (Carcharhinus longimanus), and silky (C. falciformis) sharks discarded in two tuna target fisheries in the western and central Pacific Ocean. The study found, that the condition at release (good versus injured) and the amount trailing gear left on the animals were the two factors that had the largest effect on post release fate. Animals released in good condition without trailing gear had the highest rates of survival.
Keywords:

[+]

Bycatches Longlining (Fisheries) Sharks Wildlife Conservation
Series:

PIFSC working paper ; WP-19-003
DOI:

https://doi.org/10.25923/2sxy-s659
Document Type:

Working Paper
Place as Subject:

Pacific Ocean
Rights Information:

Public Domain
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:13c6b429ad40cfd8609830d5f8c577701b1828b85321b274633cf02c771340c8
Download URL:

https://repository.library.noaa.gov/view/noaa/23442/noaa_23442_DS1.pdf
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Quantifying post release mortality rates of sharks incidentally captured in Pacific tuna longline fisheries and identifying handling practices to improve survivorship

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