Modelling seasonal and annual variation in size at functional maturity in the European lobster (Homarus gammarus) from self-sampling data
<qd> 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. </qd>Fishers from Le...
| Published in: | ICES Journal of Marine Science |
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| Main Authors: | , , , , |
| Format: | Text |
| Language: | English |
| Published: |
Oxford University Press
2009
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| Subjects: | |
| Online Access: | http://icesjms.oxfordjournals.org/cgi/content/short/66/9/1892 https://doi.org/10.1093/icesjms/fsp166 |
| Summary: | <qd> 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. </qd>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 L 50 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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