Catch, bycatch, and mitigation options for endangered sharks in data poor fisheries: a case study on pelagic thresher sharks (Alopias pelagicus) in the eastern Indian Ocean

Muhammad Ichsan; Shaoimatul Ula; Hollie Booth; Herman; Dharmadi

doi:10.1071/PC23050

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Catch, bycatch, and mitigation options for endangered sharks in data poor fisheries: a case study on pelagic thresher sharks (Alopias pelagicus) in the eastern Indian Ocean

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Catch, bycatch, and mitigation options for endangered sharks in data poor fisheries: a case study on pelagic thresher sharks (Alopias pelagicus) in the eastern Indian Ocean

Muhammad Ichsan, Shaoimatul Ula, Hollie Booth, Herman and Dharmadi

Pacific Conservation Biology, Vol.30(6), pp.1-10

2024

DOI: https://doi.org/10.1071/PC23050

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Abstract

Aceh

conservatin

elasmobranchs

endangered species

fisheries management

Indian Ocean

Indonesia

pelagic thresher shark

Context Endangered pelagic thresher sharks (Alopias pelagicus) are facing high fishing pressure in many countries. As the world’s largest shark fishing nation, with particularly high catch rates of thresher sharks, the impact of Indonesian fisheries has become a global priority for thresher shark conservation. Therefore, baseline data is needed to inform management and implement international agreements. Aims This research provides data and management recommendations for data-poor targeted shark fishing in Western Indonesia, where thresher sharks are regularly caught. Methods Daily landings data was recorded from June 2019 to December 2020 in Southwest Aceh and analysed to explore catch patterns, risk factors for thresher sharks, and potential mitigation options. Key results Twenty-five wooden vessels of <30 gross tonnage target sharks in the Indian Ocean. We recorded a total of 109 pelagic thresher individuals during the study period, with a female-skewed sex ratio (1 female:0.39 male). Almost all pelagic threshers were caught by the bottom longline. Conclusions Based on this data, we offer some potential management measures to reduce fisheries impacts on pelagic thresher sharks by applying a simple mitigation hierarchy framework. Implications These results provide fisheries management recommendations, including effort limits and gear modifications.

Details

Title: Catch, bycatch, and mitigation options for endangered sharks in data poor fisheries: a case study on pelagic thresher sharks (Alopias pelagicus) in the eastern Indian Ocean
Authors: Muhammad Ichsan (Corresponding Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and Engineering
Shaoimatul Ula - Wildlife Conservation Society Indonesia
Hollie Booth - University of Oxford
Herman - South-west Aceh Marine and Fisheries Agency
Dharmadi - Ministry of Marine Affairs and Fisheries - Jakarta, Indonesia (MMAF)
Publication details: Pacific Conservation Biology, Vol.30(6), pp.1-10
Publisher: C S I R O Publishing
Date published: 2024
DOI: 10.1071/PC23050
ISSN: 2204-4604; 1038-2097
Copyright note: © 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Data Availability: The data that support this study will be shared upon reasonable request to the corresponding author.
Grant note: This research was funded by Fondation Segré via ZSL EDGE of Existence Fellowship.
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 991087892202621
Output Type: Journal article

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