Survival of undersized plaice (Pleuronectes platessa), sole (Solea solea), and dab (Limanda limanda) in North Sea pulse-trawl fisheries

K.J. van der Reijden*, P. Molenaar, C. Chen, S.S. Uhlmann, P.C. Goudswaard, B. van Marlen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

The European Commission landing obligation, including species-specific “high survival” exemptions, has established a need for accurate discard survival estimates. This study presents the first discard survival estimates on-board Dutch commercial pulse trawlers. During seven, six, and one fishing trip(s), respectively, undersized plaice (Pleuronectes platessa), sole (Solea solea), and dab (Limanda limanda) were collected, assessed for vitality and subsequently monitored up to 21 days. Uncorrected for any potential impacts from predation, tagging, research-related handling, or holding conditions overall survival for plaice (n¼349), sole (n¼226), and dab (n¼187) was assessed as 15% [95% CI: 11–19%], 29% [95% CI: 24–35%], and 16% [95% CI: 10–26%] respectively. Survival was mainly effected by water temperature and factors linked to the fishing vessel. Fish length was not found to affect survival. Catch processing time and haul duration affected plaice survival but not sole. Vitality index, which averages reflex impairment and external damage scores, correlated with survival and may be developed as a proxy for discard survival. Compared to tickler-chain beam trawlers, pulse trawlers showed relatively higher discard survival under fishing conditions pertinent
to these studies.
Original languageEnglish
Pages (from-to)1672-1680
JournalICES Journal of Marine Science
Volume74
Issue number6
Early online date1 Mar 2017
DOIs
Publication statusPublished - 1 Jul 2017

Keywords

  • bottom trawling
  • discard mortality
  • pulse trawling
  • reflex ompairment

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