Actual status of the ichthyofauna of the Mono river basin (Togo and Benin)

Conference (2012)

La pêche aux nasses dans le delta du fleuve Ouémé, Bénin : implications pour une gestion rationnelle des ressources halieutiques

Poster (2012)

Stratégies de reproduction et structure des populations chez Labeo parvus (cypriniformes: cyprinidae) dans le bassin du fleuve Ouémé au Bénin

in Annales des Sciences Agronomiques du Bénin (2011), 15(2), 153-171

La stratégie de reproduction et la structure des populations chez Labeo parvus ont été étudiées dans le bassin du fleuve Ouémé (Bénin) entre avril 2005 et mars 2006. Les poissons ont été capturés ... [more ▼]

La stratégie de reproduction et la structure des populations chez Labeo parvus ont été étudiées dans le bassin du fleuve Ouémé (Bénin) entre avril 2005 et mars 2006. Les poissons ont été capturés mensuellement par des pêcheurs professionnels au moyen de filets maillants. Les filets sont posés le soir et relevés le lendemain matin. La structure démographique de L. parvus a été examinée sur la base de la distribution des fréquences de tailles. La stratégie de reproduction a été étudiée à partir de l’indice gonadosomatique (IGS), la structure ovarienne et la fécondité. Les populations de L. parvus présentent une structure par tailles de type bimodal. Le premier mode est représenté par les juvéniles 0+ (≤ 9 cm LT) issus de la reproduction de l’année. Le deuxième mode est constitué des géniteurs (13-28 cm LT). Sur 1088 specimens collectés dans le fleuve Ouémé, 14,9% sont des juvéniles (< 9 cm LT), 6% pré-adultes (9-13 cm LT) et 79,1% adultes (> 13 cm LT). L’analyse de la structure ovarienne montre un développement synchrone des ovocytes avec la présence de deux cohortes conduisant à une ponte. La saison de reproduction est comprise entre juillet et octobre correspondant à la crue fluviale maximale dans le bassin avec une forte fécondité (8723 à 124363 ovules). L. parvus est une espèce potamodrome, géniteur synchrone qui se concentre dans le fleuve avant de migrer pendant les crues fluviales dans les plaines inondables pour pondre. [less ▲]

Population dynamics of Labeo senegalensis Valenciennes 1842 (Pisces: Cyprinidae) in the Oueme River, Benin

in Journal of Fisheries International (2011), 6(3), 52-58

he present study was conducted to understand the population parameters of Labeo senegalensis in Benin. Growth and mortality parameters, exploitation rates and annual recruitment patterns were estimated ... [more ▼]

he present study was conducted to understand the population parameters of Labeo senegalensis in Benin. Growth and mortality parameters, exploitation rates and annual recruitment patterns were estimated from monthly length-frequency samples between April, 2005 and March, 2006 for Labeo senegalensis in the Oueme river. Total length of the sampled 1436 fish ranged from 6.3-52.7 cm. The Von Bertalanffy Growth Function (VBGF) was fitted to the 12 consecutive month’s length-frequency data to obtain a VBGF with the following parameters: L∞ = 57 cm TL, K = 0.30 year-1. The growth performance index (ø') was calculated as 2.99. The total mortality estimates from the catch curve analysis was Z = 1.47 year-1 with a natural mortality M of 0.68 year-1 for a mean environmental temperature of 28°C. The fishing mortality F estimates was 0.79 year-1. The maximum of recruitment was recorded in June to September, indicating recruitment of one cohort year-1. The estimated potential longevity Tmax was 10 years. The exploitation ratio was 0.55 indicating that the Labeo senegalensis stock is on the verge being overfished. The results are discussed and compared to previously available information on Labeo senegalensis in others rivers. [less ▲]

Population parameters of African carp: Labeo parvus Boulenger, 1902 (Pisces: Cyprinidae) in the Ouémé River in Bénin (West Africa).

in North-Western Journal of Zoology (2009), 5(1)

Etude de l'âge et de la croissance chez Clarias gariépinus (Pisces, Clariidae) dans le delta de l'Ouémé au Bénin (Afrique de l'Ouest)

in International Journal of Biological and Chemical Sciences (2008), 2(2), 157-167

Caractéristiques de la pêche dans le fleuve Ouémé au Bénin (Afrique de l'Ouest)

in Snoeks, Jos; Lalèyè, Philippe; Vandewalle, Pierre (Eds.) Proceedings of the third international Conference on Africa Fish and Fisheries, Cotonou, Bénin, november 2003 (2007)

A study of the Ouémé River fisheries carried out between 1999 and 2001 recorded some 13 fishing gears and capture methods. Gillnets and traps are the most used gear in the north, whereas the fishing ... [more ▼]

A study of the Ouémé River fisheries carried out between 1999 and 2001 recorded some 13 fishing gears and capture methods. Gillnets and traps are the most used gear in the north, whereas the fishing equipment in the southern stations is more diverse, with many variants, each tailored to specific needs (exploited biotope, target species, hydrologic seasons). High fishing pressure is exerted on resources in the south and yield of some fishing gears is in decline: 2.2 kg of catch per day for the gillnets, 3.5 kg for “dobah” and 1.4 kg of catch for castnet versus respectively, 5.2 kg, 4.3 kg, and 1.6 kg recorded in the Ouémé delta during 1968 and 1969. The specific composition of catches has considerably changed and now characterized by dominance of small fishes. Large spacies such as Heterobranchus longifilis, Chrysichthys nigrodigitatus, Gymnarchus niloticus and Lates niloticus, formerly abundant in the catches, have now become very rare. In order to better understand the general ecology of the river and is hydrologic regime and to estimate total fish production, a complementary study is nesccessay. This prerequisite for a good and sustainable management plan. [less ▲]

Proceedings of the third international Conference on African Fish and Fisheries, Cotonoun Bénin, novmeber 2003

Book published by Royal Museum for Central Africa (2007)

Artisanal gill-net fishery catches of the catfish, Schilbe intermedius (Tleostei:Schilbeidae), in two tributaries of the Ouémé River, Benin, West Africa

in African Journal of Aquatic Science (2005), 30(2), 163-166

early development of the condrocranium in Chrysichtys auratus (Siluriformes, Claroteidae)

Poster (1998)