Author(s): Isabelle Mady-Goma Dirat, Anthelme Tsoumou, Louis Regis Dossou-Yovo, Léon Akoua, Marceline Mikia, Durelle Brith C, Olabi-Obath and Joseph Vouidibio

Abstract: The inventory of the ichthyo fauna of the Alima watershed was carried out in four rivers of Boundji district (Angouewele River, Engondo River, Andouwou River and Amegni River). Fishes were captured with cast nets, gill nets, rotenone and drain fishing shows a species richness of 52 species, belonging to 36 genus, 21 families and 10 orders. Three orders were more represented in all rivers: Siluriformes (31%), Osteoglossiformes (28%) and Characiformes (11.32%). Mormyridae (20.75%), Cichlidae (9.48%) and Claroteidae (9.44%) were the most common families. The Mormyridae was the most diversified with 11 species. Angouewele, Amegni and Engondo have the most diversified and balanced populations with diversity index values between 3.24 and 3.96 and equitability between 0.71 and 0.81. Andouwou on the other hand, was the least diversified with 2.97 and an equitability of 0.66. The presence of species such as Pollymyrus sp., Raïamas chrysti, Raïamas buchholzi, Mastacembelus sp. more oxygen consumers, proves that the waters of these courses are still of good quality. The fish inventories must continue on the middle and upper courses of the Alima River.

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