Prediction of selectivity from morphological conditions: Methodology and a case study on cod (Gadus morhua)

Bent Herrmann, Ludvig Ahm Krag, Rikke Frandsen, Niels Madsen, Bo Lundgren, Karl-Johan Stæhr

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The FISHSELECT methodology. tools, and software were developed and used to measure the morphological parameters that determine the ability of cod to penetrate different mesh types, sizes, and openings. The shape of one cross-section at the cod's head was found to explain 97.6% of the mesh penetration results obtained in a laboratory experiment. Design guides predicting the 50% retention length (L50) of different mesh types, sizes, and openings were produced and compared with results from sea trials. Results show that the morphology-based simulations can be used to explain both the within-haul and the between-haul variations previously reported from sea trials. Finally, based on the results obtained, ideas to improve the size selection of cod in towed gear are presented.
Original languageEnglish
JournalFisheries Research
Volume97
Issue number1-2
Pages (from-to)59-71
ISSN0165-7836
DOIs
Publication statusPublished - 2009

Keywords

  • Morphology
  • Mesh penetration
  • FISHSELECT
  • Atlantic cod Gadus morhua
  • Size selectivity

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