  Population dynamics of Labeo senegalensis Valenciennes 1842 (Pisces: Cyprinidae) in the Oueme River, Benin; ; Ovidio, Michaël  et alin 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 ▲] Detailed reference viewed: 46 (1 ULg) 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); ; Vandewalle, Pierre et alin International Journal of Biological and Chemical Sciences (2008), 2(2), 157-167 Detailed reference viewed: 33 (4 ULg)Artisanal gill-net fishery catches of the catfish, Schilbe intermedius (Tleostei:Schilbeidae), in two tributaries of the Ouémé River, Benin, West Africa; ; et al in African Journal of Aquatic Science (2005), 30(2), 163-166 Detailed reference viewed: 12 (4 ULg)Early development of the chondrocranium in Chrysichtys auratus (Pisces, Siluriformes, Claroteidae)Vandewalle, Pierre ; ; et alin Journal of Fish Biology (1999), 55 The inception and development of the cartilaginous cephalis skeleton of Chrysichthys auratus is described from hatching to about 18 days post-hatching. At hatching, no skeletal structure is present. Not ... [more ▼] The inception and development of the cartilaginous cephalis skeleton of Chrysichthys auratus is described from hatching to about 18 days post-hatching. At hatching, no skeletal structure is present. Not until day 3 do clearly delimited cranial primordia become apparent. As in many siluriforms, the neurocranium is platybasic from the start, the suspensorium constitutes, with Meckel’s cartilage and the hyoid bar, a single cartilaginous element, and the junction between the front and rear of the neurocranium is complete on day 4. By day 8 the quadratomandibular joint has formed and the tectum posterius has appeared. Cartilage reduction first affects the trabecular bars, then, markedly, the visceral arches. By day 18 the braincase floor has almost disappeared. [less ▲] Detailed reference viewed: 20 (1 ULg)early development of the condrocranium in Chrysichtys auratus (Siluriformes, Claroteidae)Vandewalle, Pierre ; ; et alPoster (1998) Detailed reference viewed: 3 (0 ULg) |
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