e-journal

Squaring the circle: reconciling fishing and conservation of aquatic ecosystems

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Size-at-entry regulations in fisheries cause major disruption to aquatic ecosystems, including truncation of age- and size-structures, destabilization of fish stocks, directional selection on phenotypic traits and a by-catch of unwanted species and sizes. Here, we use simple dynamic models of size-spectra to examine an alternative, socalled balanced harvesting. Balanced harvesting helps in retaining the approximate power-law size-structure of natural ecosystems, whereas size-at-entry regulations do not. Balanced harvesting is less likely to destabilize steady states than size-atentry regulations set close to the size at maturation. Surprisingly, our numerical results suggest that steady-state biomass yield can be substantially increased by switching from size-at-entry to balanced harvesting. On the basis of these results, we argue that the goals of conservation and of greater yields seem less difficult to
reconcile than have previously been thought. However, to work towards these goals require a change in our approach to fishing.

Keywords Balanced harvesting, fishing-induced instability, maximum sustainable yield, power-law size-structure, resilience, size-spectra

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Ketersediaan

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Informasi Detail

Judul Seri

Fish and Fisheries

No. Panggil

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Penerbit

New Zealand : John Wiley & Sons Ltd., 2013

Deskripsi Fisik

Fish and Fisheries 2015, 16, 160–174

Bahasa

English

ISBN/ISSN

DOI: 10.1111/faf.120

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2015, 16, 160–174

Subjek

PERIKANAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

Mutia/Agus

Versi lain/terkait

Lampiran Berkas

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