Journal
FISHERIES RESEARCH
Volume 108, Issue 1, Pages 22-30Publisher
ELSEVIER
DOI: 10.1016/j.fishres.2010.11.016
Keywords
Growth; Homarus gammarus; Hatchery-reared lobster; Mark-recapture; North Sea
Categories
Funding
- Ministry of Fisheries and Agriculture of the State of Schleswig-Holstein, Germany
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From 2000 to 2005 about 5400 one-year-old hatchery-reared lobsters (Homarus gammarus) were tagged and released at the rocky island of Helgoland, North Sea. To date, 1-8% of the different release cohorts were recaptured in the field and 8-19% of these lobsters were recaptured from the semi-open area of the outer harbour. The recaptured lobsters indicated good development and growth conditions. The smallest berried females caught were 83 mm carapace length and 4 years old. The proportion of cultured lobsters to all measured lobsters captured around the island was 3-8% in the years 2007-2009. The population size of two cohorts was assessed using the Lincoln-Peterson method and the estimated survival rate averaged 30% and 40%. Minimum landing size of cultured lobsters was reached after 4-7 years. Cultured lobsters showed strong fidelity to their release sites, and thus remained around the island of Helgoland. A basis has been laid to enhance this endangered lobster population by means of a large scale restocking programme. (C) 2010 Elsevier B.V. All rights reserved.
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