Journal Article

Survival of decapod crustaceans discarded in the <i>Nephrops</i> fishery of the Clyde Sea area, Scotland

M. Bergmann and P. G. Moore

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 58, issue 1, pages 163-171
Published in print January 2001 | ISSN: 1054-3139
Published online January 2001 | e-ISSN: 1095-9289 | DOI:
Survival of decapod crustaceans discarded in the Nephrops fishery of the Clyde Sea area, Scotland

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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

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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