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ICES Journal of Marine Science: Journal du Conseil 2001 58(1):163-171; doi:10.1006/jmsc.2000.0999
© 2001 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Survival of decapod crustaceans discarded in the Nephrops fishery of the Clyde Sea area, Scotland

M. Bergmann and P. G. Moore

University Marine Biological Station Millport Isle of Cumbrae, KA28 0EG, UK

Correspondence to Melanie Bergmann, tel: +44 (0) 1248 351151; fax: +44 (0) 1248 716367; e-mail: mbergman{at}bangor.ac.uk

The Clyde Sea Nephrops fishery produces large amounts of invertebrate discards. Of these, as much as 89% are decapod crustaceans, including the swimming crab Liocarcinus depurator (Linnaeus, 1758), the squat lobster Munida rugosa (Fabricius, 1775) and the hermit crab Pagurus bernhardus (Linnaeus, 1758). The short-term mortality of these species was assessed following trawling and periods of aerial exposure on deck (16–90 min), and ranged from 2–25%, with Pagurus bernhardus showing the lowest mortality. Two experiments were performed to determine the longer-term survival of trawled decapods compared to those with experimentally ablated appendages. Deliberately damaged decapods had a significantly lower longer-term survival (ca. 30%) than controls (72–83%). Survival of trawled Liocarcinus depurator that had been induced to autotomize two appendages was slightly lower (74%) compared with intact creel-caught animals (92%). Mortality rates stabilised about 10 d after trawling. Our results suggest that post-trawling mortality of discarded decapod crustaceans has been underestimated in the past, owing to inadequate monitoring periods.

Keywords: by-catch mortality, trawling, discards, injury, autotomy, decapod crustaceans, Liocarcinus depurator, Munida rugosa, Pagurus bernhardus, Scotland, survival

Received 1 June 2000; accepted 22 August 2000.


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