Fécondité de Nephrops norvegicus dans le golfe de Gascogne |
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| Authors: | Y Morizur G Conan A Guénolé M H Omnès |
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| Institution: | (1) Centre Océanologique de Bretagne, BP 337, F-29273 Brest Cédex, France;(2) Institut Scientifique et Technique des Pêches Maritimes, 8 rue François-Toullec, F-56100 Lorient, France |
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| Abstract: | Females of the Norway lobster Nephrops norvegicus (L.) incubate their eggs under the abdomen for a period of several months. We estimated the individual fecundity of N. norvegicus (1) before spawning, and (2) at the end of the incubation period. From these two relationships, we then calculated the average egg loss. Egg loss seems to be relatively higher for small females than for large ones. The mean egg loss estimated for the Bay of Biscay (45%) differs from the only other existing value (75%) calculated by other authors for Portuguese waters. Egg loss may regulate stock-density, and may be a mechanism intervening in stock-recruitment. In order to estimate the fecundity per recruit, fecundity at the end of the incubation period must be used: this takes into account the rate of egg loss as a function of female length.
Contribution No. 721, du Centre Océanologique de Bretagne |
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