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

    Research output: Contribution to journalA1: Web of Science-articlepeer-review

    Abstract

    van der Reijden, K. J., Molenaar, P., Chen, C., Uhlmann, S. S., Goudswaard, P. C., and van Marlen, B. Survival of undersized plaice (Pleuronectes platessa), sole (Solea solea), and dab (Limanda limanda) in North Sea pulse-trawl fisheries. – The European Commission landing obligation, including species-specific " high survival " exemptions, has established a need for accurate dis-card 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, as-sessed 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 (n ¼ 349), sole (n ¼ 226), and dab (n ¼ 187) 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 dis-card survival. Compared to tickler-chain beam trawlers, pulse trawlers showed relatively higher discard survival under fishing conditions per-tinent to these studies.
    Original languageEnglish
    JournalICES Journal of Marine Science
    ISSN1095-9289
    DOIs
    Publication statusPublished - 1-Mar-2017

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