Biologie de Penaeus duorarum en Côte d'Ivoire. 3. Étude des variations quotidiennes des rendements et leur relations avec l'hydroclimat. Essai de généralisation au Golfe de Guinée

Garcia, S. and Pétit, P. and Fonténeau, A. (1973) Biologie de Penaeus duorarum en Côte d'Ivoire. 3. Étude des variations quotidiennes des rendements et leur relations avec l'hydroclimat. Essai de généralisation au Golfe de Guinée. Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan, 4(2), pp. 71-104.

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Abstract

Hydroclimatic conditions in the Gulf of Guinea between Senegal and Nigeria are briefly described emphasizing the seasonal variations of transparency. Analysis of the Abidjan based shrimp fleet allowed to the description of the seasonal variations of activity rhythms for Côte d'Ivoire, Ghana, and Nigeria. These rhythms are different between seasons, between fishing grounds, and sometimes even between depths on a given ground. These variations follow the turbidity ones. Diurnal activity is observed in very turbid waters, nocturnal and transition activity in clearer ones. The authors assume that the basic behaviour is a nocturnal one, but that the shrimp-trawlers catches reflect some apparently different ones resulting from diel variations in the stock availability. To explain the apparently diurnal behaviour observed most of the year over the whole Gulf of Guinea it is suggested that these generally benthic shrimps become nectonic at night when turbidity is very high. The results obtained in Ivory Coast, Ghana and Nigeria are compared to those from Senegal where hydroclimatic conditions are different. The similarities are emphasized. The differences in observed behaviour are supposedly caused by the cold season water temps which are sufficiently low to disturb the nor mal activity rhythm.

Item Type: Article
Title: Biologie de Penaeus duorarum en Côte d'Ivoire. 3. Étude des variations quotidiennes des rendements et leur relations avec l'hydroclimat. Essai de généralisation au Golfe de Guinée
Personal Creator/Author:
CreatorsEmail
Garcia, S.
Pétit, P.
Fonténeau, A.
Journal or Publication Title: Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan
Volume: 4
Number: 2
Page Range: pp. 71-104
Date: June 1973
Issuing Agency: Centre de Recherches Océanographiques, Côte d'Ivoire
Uncontrolled Keywords: Côte d'Ivoire; Gulf of Guinea; Penaeus duorarum; northern pink shrimp; hydroclimate; seasonal variations
Subjects: Biology
Ecology
Oceanography
Item ID: 8020
Depositing User: Ms Maria Kalentsits
Date Deposited: 08 Mar 2012 12:37
Last Modified: 08 Mar 2012 12:37
URI: http://aquaticcommons.org/id/eprint/8020

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