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Predictive models for codend size selectivity for four commercially important species in the Mediterranean bottom trawl fishery in spring and summer: Effects of codend type and catch size

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  • Jure Brčić
  • Bent Herrmann
  • Antonello Sala

Abstract

Models to predict codend size selectivity for four major commercial species—European hake (Merluccius merluccius), Norway lobster (Nephrops norvegicus), deep-water rose shrimp (Parapenaeus longirostris), and Atlantic horse mackerel (Trachurus trachurus)–in Mediterranean bottom trawl fisheries were established based on data collected during fishing trials using the two legal codends: a 40 mm square-mesh codend and a 50 mm diamond-mesh codend. The models were applied to predict the extent to which size selection depend on codend type, also accounting for the potential effect of codend catch size and fishing season. The size selectivity of the two codends was evaluated and compared in identical simulated controlled conditions. Mesh type significantly affected the size selection of Norway lobster alone, with a slightly better performance of the 40 mm square-mesh codend. A high risk of retention of undersized individuals was predicted for both codends for all species except Norway lobster.

Suggested Citation

  • Jure Brčić & Bent Herrmann & Antonello Sala, 2018. "Predictive models for codend size selectivity for four commercially important species in the Mediterranean bottom trawl fishery in spring and summer: Effects of codend type and catch size," PLOS ONE, Public Library of Science, vol. 13(10), pages 1-26, October.
    • Handle: RePEc:plo:pone00:0206044
    DOI: 10.1371/journal.pone.0206044
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    1. Antonello Sala & Bent Herrmann & Francesco De Carlo & Alessandro Lucchetti & Jure Brčić, 2016. "Effect of Codend Circumference on the Size Selection of Square-Mesh Codends in Trawl Fisheries," PLOS ONE, Public Library of Science, vol. 11(7), pages 1-16, July.
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