Oceanographic determinants of ocean sunfish (Mola mola) and bluefin tuna (Thunnus orientalis) bycatch patterns in the California drift gillnet fishery

N Hahlbeck; Kylie L Scales; H Dewar; S M Maxwell; S J Bograd; E L Hazen

doi:10.1016/j.fishres.2017.03.011

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Oceanographic determinants of ocean sunfish (Mola mola) and bluefin tuna (Thunnus orientalis) bycatch patterns in the California drift gillnet fishery

Journal article

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Oceanographic determinants of ocean sunfish (Mola mola) and bluefin tuna (Thunnus orientalis) bycatch patterns in the California drift gillnet fishery

N Hahlbeck, Kylie L Scales, H Dewar, S M Maxwell, S J Bograd and E L Hazen

Fisheries Research, Vol.191, pp.154-163

2017

DOI: https://doi.org/10.1016/j.fishres.2017.03.011

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Abstract

Bycatch

ecosystem-based fisheries management

dynamic ocean management

bluefin tuna

mola

generalized additive model

The reduction of incidental capture of non-target species in a fishery (bycatch) is a key objective of ecosystem-based fisheries management (EBFM) and critical to the conservation of many marine species. Predicting bycatch events can inform targeted ecosystem-based management approaches to reduce risk. Here, the probability of ocean sunfish (Mola mola) and bluefin tuna (Thunnus orientalis) bycatch in the California large-mesh drift gillnet fishery is predicted using a suite of remotely-sensed environmental variables. Generalized additive models (GAMs) were used to model bycatch probability for these species in 8045 observed sets from 1990 to 2011, and predictive capabilities were assessed using k-fold cross validation.Bycatchprobabilities for bothspecies were elevated inregions of cool sea surface temperatures (<17 â—¦C), likely related to seasonal upwelling dynamics in the California Current, a major eastern boundary upwelling ecosystem. Mola bycatch occurred primarily in late fall, at moderate eddy kinetic energy values (0.006-0.008 m2/s2) and in areas of high seafloor rugosity. Bluefin tuna bycatch rates were higher west of the Southern California Bight, also in late fall, and appear to be associated with the seasonal upwelling frontal zone. These models can be used with near-real time satellite data by both fishers and managers for bycatch avoidance, providing a tool for more dynamic ocean management strategies.

Details

Title: Oceanographic determinants of ocean sunfish (Mola mola) and bluefin tuna (Thunnus orientalis) bycatch patterns in the California drift gillnet fishery
Authors: N Hahlbeck (Author) - Ernest F. Hollings Scholar, United States
Kylie L Scales (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
H Dewar (Author) - NOAA Southwest Fisheries Science Center, United States
S M Maxwell (Author) - Old Dominion University, United States
S J Bograd (Author) - NOAA Southwest Fisheries Science Center, United States
E L Hazen (Author) - NOAA Southwest Fisheries Science Center, United States
Publication details: Fisheries Research, Vol.191, pp.154-163
Publisher: Elsevier BV
Date published: 2017
DOI: 10.1016/j.fishres.2017.03.011
ISSN: 0165-7836
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99451084402621
Output Type: Journal article

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Web Of Science research areas: Fisheries

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