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Shark depredation in commercial and recreational fisheries

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Abstract

Shark depredation, where a shark partially or completely consumes an animal caught by fishing gear before it can be retrieved to the fishing vessel, occurs in commercial and recreational fisheries worldwide, causing a range of negative biological and economic impacts. Despite this, it remains relatively understudied compared to other fisheries issues. This is the first review of the literature relating to shark depredation, which also includes an overview of the potential mechanisms underlying its occurrence and options for mitigation. Furthermore, this review highlights key research gaps that remain to be investigated, thereby providing impetus for future research. In total, 61 studies have been published between 1955 and 2018, which include information on shark depredation. These studies recorded quantitative rates of depredation between 0.9 and 26% in commercial and recreational fisheries and during research fishing, identified 27 shark species from seven families that were responsible for depredation and discussed potential factors influencing its occurrence. Information from research into bycatch mitigation and the testing of shark deterrent approaches and technologies is also presented, in the context of applying these approaches to the reduction of shark depredation. This review presents an holistic overview of shark depredation in fisheries globally and, in doing so, provides a central resource for fisheries researchers and managers focusing on this topic to stimulate further collaborative research on this important fisheries issue.

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Acknowledgements

J.D.M was supported by the Australian Federal Government and The University of Western Australia, in the form of an International Postgraduate Research Scholarship and Australian Postgraduate Award. Further support was provided by the Jock Clough Marine Foundation. The authors declare that there are no conflicts of interest for this study.

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  1. School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia, 6009, Australia

    J. D. Mitchell & T. J. Langlois

  2. The UWA Oceans Institute, Indian Ocean Marine Research Centre, Cnr. of Fairway and Service Road 4, Crawley, Western Australia, 6009, Australia

    J. D. Mitchell, D. L. McLean, S. P. Collin & T. J. Langlois

  3. Oceans Graduate School, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia, 6009, Australia

    D. L. McLean & S. P. Collin

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Mitchell, J.D., McLean, D.L., Collin, S.P. et al. Shark depredation in commercial and recreational fisheries. Rev Fish Biol Fisheries 28, 715–748 (2018). https://doi.org/10.1007/s11160-018-9528-z

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