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Conference papers

Données actuelles sur la biologie d'Acipenser sturio dans l'estuaire de la Gironde

Abstract : The sturgeon (Acipenser sturio) which is an endangered species has been investigated in the Gironde Estuary from 1981 to 1988. The studies have been realized in the low part of the Gironde Estuary and have concerned mainly the juvenile population(about 25 cm to 145 cm). The juveniles provides information on the existence of reproduction in the natural environment (recruitment) and on potential genitors which are only caught of tags and registred 687 recaptures, 62 of which were made in the sea. The effective growth, measured on a sample of 82 fishes tagged and recaptured about 1 year later is distinctly more important than the one deducted from Magnin (1962) between 65 and 105 cm. The analysis of the frequency distribution shows a high proportion of individuals which size ranged from 72 to 114 cm and an ageing of this juvenile population. A first estimate of the juvenile stock is given, using Jolly's method. The migratory cycle deducted from our results is lightly different from the one described by Magnin (1962). The juveniles join the group who makes the seasonal migration upstream, right from the age of one year, and get back to the sea with them. Probably, the juveniles don't just stay in the estuary between May and October ; they come and go between sea and estuary. The sea distribution area extends way beyond the French coast. The prospects of restoration of the species are briefly discussed in a conclusion.
Mots-clés : GIRONDE
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Conference papers
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https://hal.inrae.fr/hal-02575987
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Submitted on : Thursday, May 14, 2020 - 5:31:09 PM
Last modification on : Tuesday, September 14, 2021 - 9:54:01 AM

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  • HAL Id : hal-02575987, version 1
  • IRSTEA : PUB00002764

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Gérard Castelnaud, Eric Rochard, Philippe Jatteau, Mario Lepage. Données actuelles sur la biologie d'Acipenser sturio dans l'estuaire de la Gironde. Acipenser : actes du premier colloque international sur l'esturgeon, Oct 1989, Bordeaux, France. pp.251-275. ⟨hal-02575987⟩

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