Biologie et dynamique d'un Sciaenidae ouest-africain Pseudotolithus senegalensis (V.)

Troadec, J.P. (1971) Biologie et dynamique d'un Sciaenidae ouest-africain Pseudotolithus senegalensis (V.). Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan, 2(3), pp. 1-225.

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Abstract

In relation to the hydroclimate prevailing off Congo (B) and Côte d'Ivoire, synchronic variations are described in abundance and distribution of Pseudotolithus senegalensis V., economically the most important species in the West African trawl fishery. Although this fish prefers the warm surface layer, it is relatively indifferent to hydrological conditions, since it may also occur in the thermocline down to the higher levels of 'Central South Atlantic Water'. The oxygen concentration appears to have an important effect upon their distribution, especially the low concentrations occurring with the upwelling. The main biological functions, such as spawning and recruitment times, condition factor, diet and ring appearance on otoliths, also follow cycles, which are parallel with the hydroclimate one. Therefore, the ring-shaped structures revealed by burning previously ground otoliths could be easily interpreted. Thus, an accurate method for ageing tropical fish is now available. From the age determinations for the Congolese stock, it appears that growth is fast and total mortality rate high. An influence of fishing effort, which increased 3 times during the exploited phase of sampled specimens, appears both in growth and in total mortality. From there an estimate for the fishing mortality could be given. The estimates of dynamic parameters for the Congolese stock are then used in the Beverton-Holt model. A valuable increase of the yield could be expected, if mesh size is widened and effort restricted.

Item Type: Article
Title: Biologie et dynamique d'un Sciaenidae ouest-africain Pseudotolithus senegalensis (V.)
Personal Creator/Author:
CreatorsEmail
Troadec, J.P.
Journal or Publication Title: Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan
Volume: 2
Number: 3
Page Range: pp. 1-225
Date: December 1971
Issuing Agency: Centre de Recherches Océanographiques, Côte d'Ivoire
Additional Information: This study was presented as a PhD thesis at the Faculty of Sciences of the "Université d'Aix-Marseille II (Centre Universitaire de Luminy) on Nov the 27th 1970. It obtained the special mention of the jury.
Uncontrolled Keywords: Côte d'Ivoire; Congo; Pseudotolithus senegalensis; west-African Sciaenidae; trawl fishing; fish distribution
Subjects: Biology
Fisheries
Management
Item ID: 7946
Depositing User: Ms Maria Kalentsits
Date Deposited: 14 Mar 2012 08:34
Last Modified: 14 Mar 2012 08:34
URI: http://aquaticcommons.org/id/eprint/7946

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