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Survival of undersized plaice (Pleuronectes platessa), sole (Solea solea), and dab (Limanda limanda) in North Sea pulse-trawl fisheries
van der Reijden, K.J.; Molenaar, P.; Chen, C.; Uhlmann, S.S.; Goudswaard, P.C.; van Marlen, B. (2017). Survival of undersized plaice (Pleuronectes platessa), sole (Solea solea), and dab (Limanda limanda) in North Sea pulse-trawl fisheries. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 74(6): 1672-1680. https://dx.doi.org/10.1093/icesjms/fsx019
In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139; e-ISSN 1095-9289, more
Peer reviewed article  
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Keyword
    Marine/Coastal
Author keywords
    bottom trawling; discard mortality; pulse trawling; reflex impairment
Authors  Top 
  • van der Reijden, K.J.
  • Molenaar, P.
  • Chen, C.
  • Uhlmann, S.S., more
  • Goudswaard, P.C.
  • van Marlen, B.
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 (n = 349), sole (n = 226), and dab (n = 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 discard survival. Compared to tickler-chain beam trawlers, pulse trawlers showed relatively higher discard survival under fishing conditions pertinent to these studies.
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