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RESUMELa crevette Atya scabra (Leach, 1815) est traditionnellement capturée dans la Rivière Bia à Biaka et Aboisso. Dans ces localités, la pêche est dominée par les Ivoiriens (94%) représentés par les Agni contre 6% pour les non nationaux. A Aboisso, en plus des Agni (52%), nous avons eu des Tchui (4%), des Ashanti (4%), des Mossi (4%), des Dida (4%), des Lobi (5%), des Bété (4%), des Malinké (13%), des Sénoufo (5%) et des Baoulé (5%). Quant à Biaka, des Agni (92%), des Baoulé (4%) et des Wobé (4%) ont été enregistrés. Outre des pêcheurs professionnels, environ 75% des acteurs exercent une activité secondaire aussi bien à Aboisso qu'à Biaka. Chez les Ivoiriens exerçant cette activité, tous les âges sont présents. En revanche, les acteurs non nationaux sont âgés de moins de 30 ans. La plupart des ivoiriens acteurs du secteur ont été instruits (94%) contre 6% d'illettrés. Au niveau des non nationaux, seulement 33% des pêcheurs ont reçu une instruction primaire. Les prises saisonnières de crevettes sont significativement élevées dans la localité de Biaka par rapport à celle d'Aboisso (P < 0,05). L'effort de pêche élevé dans les deux localités constitue une entrave pour une gestion durable du stock. © 2016 International Formulae Group. All rights reservedMots clés: Crevettes, Atya scabra, acteurs de pêche, rivière Bia, Côte d'Ivoire. Characterization of freshwater shrimp Atya scabra (Leach, 1815) (Decapoda:Atyidae) fishing in the Bia river, Côte d'Ivoire ABSTRACTFreshwater shrimp Atya scabra (Leach 1815) is traditionally captured in Bia's river in Biaka and Aboisso. In this localities, fishing is dominated by Ivory Coast's people (94%) represented by Agni people against 6% of foreigners. In Aboisso, in addition to the Agni people (52%), we have had 4% of Thui people, Ashanti (4%), Mossi (4%), Dida (4%), Lobi (5%), Bété (4%), Malinké (13%), Senoufo (5%) and Baoulé people (5%). As for Biaka, Agni (92%), Baoulé (4%) and Wobé (4%) were registered for that activity. A part from the professional fishermen, nearly 75% of them do some secondary activities as well in Aboisso as Biaka. All Ivory-coast people pursuing this activity are all from different type of ages, although all foreigners are less V. KADJO et al. / Int. J. Biol. Chem. Sci. 10(2): 620-631, 2016 621 than 30 years old. The majority of the Ivory-Coast people who are doing this activity are educated as 94% against 6% who are not. Regarding the foreigners, only 33% of the fishermen received primary education. Seasonal catches of shrimp are significantly higher in Biaka region than Aboisso (P < 0.05). The high-fishing effort in these two localities is an obstacle for the long-lasting stock management.

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Cardisoma armatum Herklots, 1851 is a land crab endemic to tropical coastal ecosystems and represents an important fishery resource. C. armatum was collected using traps at the eastern region of the Ebrie lagoon and the estuarine region of the Comoé River in 2009 during the high rainy season extending from mid-May to mid-July and in low dry season from mid-July to September. Some biometric parameters are measured to determine some aspects of population structure and condition of this edible crab. Sexual dimorphism was confirmed with the major chelae of male crabs reaching larger sizes than those of females. The sex ratio that varied with the sampling periods was associated with migrations occurring during the breeding season. Positive, negative, and positive allometric growth patterns were observed for the carapace length-total weight relationship, respectively, in males, females, and the population as a whole. For the carapace width/total weight relationship, negative allometric growth was observed, respectively, in males, females, and the whole population. Our data show an evidence of a serious problem of recruitment in the population of this crab related to degradation of the habitats and heavy harvesting pressures, highlighting the necessity of developing and implanting management and protection strategies of this crustacean.

A 50-day feeding trial was carried out to determine the effect of the graded incorporation of crude palm oil on the whole-body mineral composition of African catfish juveniles Heterobranchus longifilis. Six diets were formulated to contain from 3-21% crude palm oil (CPO). Whole-body macromineral composition represented by calcium (Ca), potassium (K), sodium (Na), phosphorus (P) and magnesium (Mg) showed significant variations (p < 0.05) with the different dietary palm oil levels. The same trend was observed in whole-body micromineral composition in iron (Fe), zinc (Zn), manganese (Mn) and copper (Cu). Regardless of the micromineral, the increase in the body was related with increasing dietary palm oil levels between 3 and 9%. In summary, the results of this study suggest that an incorporation of palm oil into the fish diet modifies the mineral body composition without major effects on health and nutritional quality of fish.