Relative abundance of derelict fishing gear in the Hawaii-based pelagic longline fishery grounds as estimated from fishery observer data

Uhrin, Amy V.; Walsh, William A.; Brodziak, Jon

doi:10.1038/s41598-020-64771-1

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Relative abundance of derelict fishing gear in the Hawaii-based pelagic longline fishery grounds as estimated from fishery observer data

2020
By Uhrin, Amy V. ; Walsh, William A. ; Brodziak, Jon
Source: Scientific Reports, 10(1)

[PDF-1.60 MB]

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Details:

Journal Title:

Scientific Reports
Personal Author:

Uhrin, Amy V. ; Walsh, William A. ; Brodziak, Jon

Uhrin, Amy V. ; Walsh, William A. ; Brodziak, Jon Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; PIFSC (Pacific Islands Fisheries Science Center) ; NOS (National Ocean Service) ; ORR (Office of Response and Restoration)

NMFS (National Marine Fisheries Service) ; PIFSC (Pacific Islands Fisheries Science Center) ; NOS (National Ocean Service) ; ORR (Office of Response and Restoration) Less -
Description:

Derelict fishing gear (DFG) is abundant across the remote North Pacific Ocean, accumulating in convergence zones that coincide with the fishing grounds of the Hawai’i-based pelagic longline fishery. Longlines are prone to snagging DFG, providing an opportunistic, yet regular, reporting mechanism by longline fishery observers (fishery-dependent data). We apply a zero-inflated negative binomial model previously used to standardize catch per unit effort (CPUE) for bycatch and incidentally caught species in this fishery to estimate DFG relative abundance and qualitative trends within the longline fishing grounds. During 2008–2016, observers reported 1326 marine debris items intercepted by longlines, dominated by DFG at nearly 90%. Modeling results suggest that the relative abundance of DFG has declined ~66% from 2008–2016. DFG standardized CPUE was higher for longlines fished inside the North Pacific Subtropical Convergence Zone (versus outside) and increased moving eastward and northward toward the Great Pacific Garbage Patch. Despite substantially less effort in the shallow-set sector of the fishery (∼60 m depth), DFG standardized CPUE was four-fold greater than that of the deep-set sector (∼250 m) suggesting that marine debris observer reporting focused in this sector may be most effective. Some fishermen voluntarily stow snagged debris; incentivizing at-sea removal may elicit further cooperation.
Keywords:

[+]

Longlines (Fishery equipment)
Source:

Scientific Reports, 10(1)
DOI:

https://doi.org/10.1038/s41598-020-64771-1
Document Type:

Journal Article
Place as Subject:

North Pacific Ocean
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:e4f344a6f937432dcbcf0f076a7346b4a7262149aefb6e88b8484447a13c5cd7
Download URL:

https://repository.library.noaa.gov/view/noaa/25939/noaa_25939_DS1.pdf
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Relative abundance of derelict fishing gear in the Hawaii-based pelagic longline fishery grounds as estimated from fishery observer data

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