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

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...

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Bibliographic Details
Published in:ICES Journal of Marine Science
Main Authors: Laurans, Martial, Fifas, Spyros, Demaneche, Sebastien, Brerette, Stéphane, Debec, Olivier
Format: Article in Journal/Newspaper
Language:English
Published: Oxford university press 2009
Subjects:
Self sampling
Homarus gammarus
Functional maturity
Catchability
European lobster
Online Access:https://archimer.ifremer.fr/doc/2009/publication-7319.pdf
https://doi.org/10.1093/icesjms/fsp166
https://archimer.ifremer.fr/doc/00000/7319/
Description
Summary: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.

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