Les crabes profonds des îles Marquises (Chaceon sp. nov., Decapoda, Geryonidae)

Une nouvelle espece de crabe Geryonidae (Chaceon sp. nov.) a ete decouverte en Polynesie Francaise. L'espece n'est presente qu'aux iles Marquises, a des profondeurs comprises entre 370 et plus de 1050m. Deux campagnes de peche aux casiers ont permis de capturer 709 crabes representant un poids total de 628kg. Le rendement moyen est de 1,4kg (1,6 crabes)/casier/nuit. Il est principalement influence par la profondeur, les resultats les plus eleves etant obtenus entre 700-799m et atteignant jusqu'a 11,5kg (13 crabes)/casier/nuit pour les meilleurs casiers. Le poids moyen eleve des captures (0,9kg) et les rendements obtenus permettent d'envisager une exploitation commerciale a petite echelle sur cette espece. A new species of Geryonid crab (Chaceon sp. nov.) has been discovered in French Polynesia. The species is only located around the Marquesas islands at depths ranging from 370 up to more than 1050m. 709 crabs representing 628kg have been caught during two trapping surveys. The average yield is 1.4kg (1.6 crabs)/trap/night. It is mainly affected by the depth, the higher results being obtained within the 700-799m stratum and rising up to 11.5 kg (13 crabs)/trap/night for the best traps. The mean weight of the catches (0.9kg) and the yields obtained are high enough to initiate a small scale fishery on this species.

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