Sequential codend improves quality of trawl-caught cod

PLoS One. 2018 Oct 10;13(10):e0204328. doi: 10.1371/journal.pone.0204328. eCollection 2018.

Abstract

Trawl-caught fish are frequently associated with deteriorated catch quality. This study presents a new dual sequential codend concept with the aim of improving the quality of trawl-caught fish by minimizing the frequency and severity of catch damage. During towing, the fish are retained in an anterior codend segment with the legislated mesh size. A quality improving codend segment, is attached to the aft part of the first codend segment. Its entrance is closed during the towing phase and opened at a predefined depth during haul-back. Comparing the quality of cod (Gadus morhua L.) retained in the sequential codend with cod caught in a conventional codend, demonstrated a significant improvement in the catch quality, i.e. reduction in catch damages. Cod caught in a conventional codend had only a 3.6% probability of being without visually detectable catch damage. The probability for catching cod without catch damage was five times higher when using the dual sequential codend. Furthermore, cod caught in the sequential codend had a significantly reduced probability of incurring specific catch damage, such as gear marks, poor exsanguination, ecchymosis, and skin abrasions.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Equipment Design
  • Fisheries*
  • Gadus morhua*
  • Models, Statistical
  • Quality Improvement*
  • Seafood*

Grants and funding

This study was part of the project ‘Centre of Research-based Innovation in Sustainable Fish Capture and Processing Technology (CRISP)’, which is funded by The Norwegian Research Council (Grant No. 203477). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Nofima AS and SINTEF Ocean provided support in the form of salaries for authors SH and BH, but did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The specific roles of these authors are articulated in the ‘author contributions’ section.