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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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.
|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|
|Journal or Publication Title:||Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan|
|Page Range:||pp. 71-104|
|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|
|Depositing User:||Mr Luigi Baldassari|
|Date Deposited:||08 Mar 2012 13:37|
|Last Modified:||08 Mar 2012 13:37|
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