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Reproductive hyperallometry and managing the world's fisheries.
Marshall, Dustin J; Bode, Michael; Mangel, Marc; Arlinghaus, Robert; Dick, E J.
Afiliação
  • Marshall DJ; Center for Geometric Biology, Monash University, Melbourne VIC 3800, Australia; dustin.marshall@monash.edu.
  • Bode M; School of Mathematical Sciences, Queensland University of Technology, Brisbane QLD 4000, Australia.
  • Mangel M; Department of Biology, University of Bergen, 9020 Bergen, Norway.
  • Arlinghaus R; Institute of Marine Sciences, University of California, Santa Cruz, CA 95064.
  • Dick EJ; Puget Sound Institute, University of Washington, Tacoma, WA 98402.
Proc Natl Acad Sci U S A ; 118(34)2021 08 24.
Article em En | MEDLINE | ID: mdl-34400498
Marine fisheries are an essential component of global food security, but many are close to their limits and some are overfished. The models that guide the management of these fisheries almost always assume reproduction is proportional to mass (isometry), when fecundity generally increases disproportionately to mass (hyperallometry). Judged against several management reference points, we show that assuming isometry overestimates the replenishment potential of exploited fish stocks by 22% (range: 2% to 78%) for 32 of the world's largest fisheries, risking systematic overharvesting. We calculate that target catches based on assumptions of isometry are more than double those based on assumptions of hyperallometry for most species, such that common reference points are set twice as high as they should be to maintain the target level of replenishment. We also show that hyperallometric reproduction provides opportunities for increasing the efficacy of tools that are underused in standard fisheries management, such as protected areas or harvest slot limits. Adopting management strategies that conserve large, hyperfecund fish may, in some instances, result in higher yields relative to traditional approaches. We recommend that future assessment of reference points and quotas include reproductive hyperallometry unless there is clear evidence that it does not occur in that species.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Reprodução / Pesqueiros / Peixes Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Reprodução / Pesqueiros / Peixes Idioma: En Ano de publicação: 2021 Tipo de documento: Article