Étude du crabe rouge profond Geryon quinquedens en Côte d'Ivoire. 2 - Éléments de biologie et d'écologie avec références aux résultats obtenus au Congo

Le Loeuff, P. and Cayre, P. and Intes, A. (1978) Étude du crabe rouge profond Geryon quinquedens en Côte d'Ivoire. 2 - Éléments de biologie et d'écologie avec références aux résultats obtenus au Congo. Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan, 9(2), pp. 17-65.

[img]
Preview
PDF (The document's language is French .) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (2513Kb) | Preview

Abstract

Geryon quinquedens is present along the West African continental slope at depths from 300 to 1000 m, on silt-clay sediments. Geryon is a cold and rather poorly oxygenated water loving species. It is easily caught by traps as it is a scavenger and predatory crustacea. In a given area its distribution does not appear to be homogeneous: for example, densities of red crabs are higher in the eastern and western region of Côte d'Ivoire than in the central zone. Similar observations can be made off Congo, Angola and United States. It can be assumed that there is a relation between the abundance of Geryon and the productivity level of the area. Geographical variations of sex ratio are suspected to be correlated with the density distribution. Males and females have not the same bathymetric distribution: females are only common in the shallower waters (300-500 m) whereas males are present in the whole biotope. Seasonal migrations occur down and up the slope in both the sexes and are certainly related to the reproductive biology. Knowledge of the reproductive biology is also necessary to understand fishing-trap catch rate: egg maturation extends over several months and ovigerous females are exceptionally caught by traps; males also are less available during the same period (March to August) when migrations are less important; in this period, mean size increases and probably this happens at the end of a moult. From September to February the catch-rates increase. Growth is slow compared with other littoral Guinean Crustacea (Peneides). Females become sexually mature at a size of 80 mm (carapace width): modification in the allometric relations of abdomen and carapace are then conspicuous.

Item Type: Article
Title: Étude du crabe rouge profond Geryon quinquedens en Côte d'Ivoire. 2 - Éléments de biologie et d'écologie avec références aux résultats obtenus au Congo
Personal Creator/Author:
CreatorsEmail
Le Loeuff, P.
Cayre, P.
Intes, A.
Journal or Publication Title: Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan
Volume: 9
Number: 2
Page Range: pp. 17-65
Date: December 1978
Issuing Agency: Centre de Recherches Océanographiques, Côte d'Ivoire
Uncontrolled Keywords: Côte d'Ivoire; West African continental shelf; Geryon quinquedens; deep-sea red crab
Subjects: Biology
Oceanography
Item ID: 7955
Depositing User: Ms Maria Kalentsits
Date Deposited: 07 Mar 2012 15:24
Last Modified: 07 Mar 2012 15:24
URI: http://aquaticcommons.org/id/eprint/7955

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...