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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 25, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(9):1892-1898; doi:10.1093/icesjms/fsp166
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Modelling seasonal and annual variation in size at functional maturity in the European lobster (Homarus gammarus) from self-sampling data

Martial Laurans1, Spyros Fifas1, Sébastien Demaneche1, Stéphane Brérette1 and Olivier Debec2

1 Technopole Pointe du Diable, Ifremer, 29280 Plouzané, France
2 14 rue Pierre Bouguer, 44490 Le Croisic, France

Correspondence to M. Laurans: tel: +33 2 29 00 85 02; fax: +33 2 29 00 85 47; e-mail: martial.laurans{at}ifremer.fr

Laurans, M., Fifas, S., Demaneche, S., Brérette, S., and Debec, O. 2009. Modelling seasonal and annual variation in size at functional maturity in the European lobster (Homarus gammarus) from self-sampling data. – ICES Journal of Marine Science, 66: 1892–1898.

Fishers from Le Croisic (France) measure all the lobsters (Homarus gammarus) they capture, indicating their sex and whether the females are ovigerous or non-ovigerous. Between 2003 and 2006 and mainly between April and September, 16 884 lobsters were measured in this manner. These self-sampled data were used to study catchability and functional maturity of lobsters. The sex ratio was 50%, and catchability did not change if a female was ovigerous or non-ovigerous. With the help of a logistic function, a relationship was established between body size and the proportion of ovigerous females. For the study area, 100% of the females were mature upon reaching a carapace length (CL) of 115 mm, and the proportion of ovigerous females reached 70% each year. The L50 value evolved over a CL of 103–106 mm. From the size when 100% of the females matured (115 mm), there was a larger proportion of ovigerous females than in other studies carried out in more northern European areas.

Keywords: catchability, functional maturity, Homarus gammarus, self-sampling

Received 14 October 2008; accepted 11 May 2009; advance access publication 25 June 2009.


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