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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The parameters of growth, mortality, the exploitation and the recruitment of Atya scabra (Leach, 1815) as traditionally fished in the Bia river, were studied. These parameters were determined from the size frequencies by the FiSAT II software. The results obtained at the specimens of Aboisso were:= 156,45 mm, K = 1,50 year -1 , Φ' = 4,56, Z = 5,72 year -1 , M = 1,48 year -1 , F = 4,24 year -1 and E = 0,74 year -1 . In Biaka, the estimated values were: L = 140,7 mm, K = 0,68 year -1 , Φ' = 4,13, Z = 1,52 year -1 , M = 0,91 year -1 , F = 0,61 year -1 and E = 0,40 year -1 . Aboisso specimens have a higher growth performance index (Φ') than Biaka's and a weak longevity (tmax = 2 years) compared to Biaka (tmax = 4.41 years). Shrimps are under exploited in the locality of Biaka (E <0.5) but overexploited in Aboisso (E> 0.5). Total mortality is higher in Aboisso than in Biaka. However, the survival rate recorded in Aboisso (S = 0.003 years) is lower than that of Biaka (S = 0.22 years). Recruitment is continuous throughout the year, with two peaks (a major peak in September and a minor European Scientific Journal April 2017 edition Vol.13, No.12 ISSN: 1857 -7881 (Print) e -ISSN 1857 85 peak in February) in Aboisso. As for Biaka, the presence of a normal distribution indicates that recruitment is single. These results will serve as a database for rational management of A. scabra. Keywords

En Côte d’Ivoire, la langouste fait partir des crustacés présents dans les captures de la pêche maritime  artisanale. Cependant, aucune donnée scientifique n’est disponible quant aux acteurs de la pêche de cette protéine. Ainsi, la présente étude a pour objectif de caractériser les acteurs de la pêche à la langouste verte Panulirus regius (De Brito Capello, 1864) pratiquée au niveau de la Zone Economique Exclusive de la Côte d’Ivoire. L’étude a nécessité une enquête le long du littoral sur un effectif de 60 pêcheurs de langouste. Les résultats ont montré que la pêche langoustière est pratiquée essentiellement par les Ivoiriens et les Ghanéens. De plus, la tranche d’âge dominante chez ces pêcheurs est comprise entre 30 et 45 ans chez les Ivoiriens et Ghanéensavec des proportions de 20% et 25%, respectivement. Au niveau de la quantité de la langouste verte pêchée, la grande saison froide a enregistré la plus grande quantité de langoustes capturées.   English title: Fishing typology of the green lobster Panulirus regius, De Brito Capello, 1864 along the coast of Côte d’Ivoire (West Africa) In the Côte d’Ivoire, lobster is part of the crustaceans present in the catches of artisanal maritime fishing. However, no scientific data is available on the actors of the fishery of this protein. Thus, the objective of this study is to characterize the actors of the green lobster Panulirus regius (De Brito Capello, 1864) fishery practised in the Exclusive Economic Zone of the Côte d’Ivoire. The study required a survey along the coastline of 60 lobster fishermen. The results showed that green lobster fishing is mainly practised by citizens of Côte d’Ivoire and Ghana. Fishermen who practised this activity were aged between 30 and 45 years old with percentages of 20% and 25% for citizens of Côte d’Ivoire and Ghana, respectively. In terms of the quantity lobster captured, the largest quantity was recorded on the great cold season.

This study aimed to determine the diet and feeding habits of this species from the eastern coast of Côte d'Ivoire. The specimens were sampled from commercial catches between September 2019 and August 2020. The diet analysis has concerned the stomach of 64 males and 96 females sampled in cold seasons and 72 males and 99 females during the warm seasons. Of the total number of examined stomachs (331), 272 were empty (Coefficient of vacuity: Cv = 82%). This food index (Cv) was higher in male individuals (86.03%) than in female specimens (79.49%). The diet this species consisted mainly of fish, crustaceans, molluscs and detritus (DE). Based on the composition of its diet, the palinurid spiny lobster, P. regius could be considered to be an omnivorous species with a preference for animal materials and showed a specialist feeding strategy.