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Simulation-based evaluation of reserve network performance for Centrophorus zeehaani (Centrophoridae): a protected deep-sea gulper shark

Daley, RK, Hobday, AJ and Semmens, JM ORCID: 0000-0003-1742-6692 2019 , 'Simulation-based evaluation of reserve network performance for Centrophorus zeehaani (Centrophoridae): a protected deep-sea gulper shark' , ICES Journal of Marine Science , pp. 1-11 , doi: 10.1093/icesjms/fsz087.

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Abstract

Resource use and conservation objectives can conflict where protected species and commercially fished species occur together. We tested the potential for a previously overfished deep-sea shark (Centrophorus zeehaani) with very low biological productivity to recover in a network of three reserves. An individual-based simulation model was developed and applied using reproduction and movement data. Without any reserves or reductions in fishing mortality the population will never recover and will fail in 27.9 ± 6.1 years. With three reserves, recovery from 8% of initial numbers to a target of 20% would take 63.1 ± 3.1 years with the network in place. Length of the female cycle, natural mortality, and density dependent female dispersal are uncertain, but could delay recovery time by an additional 16.5, 98.3, or 61.9 years, respectively. Effectiveness of the reserve network was particularly sensitive to location and patchiness of the population. Doubling the size of a reserve where C. zeehaani are abundant would reduce recovery time by 12.5 years; halving it would increase recovery time by 12.0 years. Future re-opening of orange roughy fishing in waters deeper than 750 m would delay recovery of C. zeehaani by 45.9 years. The methods developed here can be used to explore co-management options for target species and protected species in fisheries.

Item Type: Article
Authors/Creators:Daley, RK and Hobday, AJ and Semmens, JM
Keywords: deep-sea gulper shark, Centrophorus zeehaani, adaptive management, individual based model, marine reserve, simulation
Journal or Publication Title: ICES Journal of Marine Science
Publisher: Academic Press Ltd Elsevier Science Ltd
ISSN: 1054-3139
DOI / ID Number: 10.1093/icesjms/fsz087
Copyright Information:

Copyright 2019 International Council for the Exploration of the Sea

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