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. 2018 Oct 22;13(10):e0206044. doi: 10.1371/journal.pone.0206044. eCollection 2018.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Body Size
  • Computer Simulation
  • Fisheries*
  • Fishes / physiology
  • Geography
  • Mediterranean Region
  • Models, Theoretical*
  • Nephropidae / physiology
  • Norway
  • Penaeidae / physiology
  • Probability
  • Seasons*
  • Species Specificity

Grants and funding

This work was funded by the Interreg research project MARTE+ (grant agreement CUP D79E1000085007 to AS) and the EU-FP7 project “BENTHIS” (grant agreement no. 312088 to AS). There was no additional external funding received for this study. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.