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L’anthropisation intensive du bassin de la Sanaga impose une acceleration des recherches sur la biodiversite et la conservation de ses ressources aquatiques. Dans ce contexte, l’ichtyofaune d’un segment du fleuve Djerem a ete etudiee en vue d’identifier les determinants environnementaux de sa distribution et de sa conservation. Trois stations situees respectivement en amont de la retenue d’eau de Mbakaou, au milieu de ce reservoir et en aval dans le Parc National du Mbam et Djerem (PNMD) ont ete retenues pour ce travail. A la suite de l’echantillonnage par peche d’avril a octobre 2015, l’etude taxonomique des poissons et de leurs habitats a revele la presence de 44 especes appartenant a 28 genres et a 13 familles. L’ichtyofaune du PNMD s’est montree la plus diversifiee (33 especes), depourvue d’especes invasives, avec une predominance d’invertivores (50,3%) et de pondeurs sur substrats divers (60,9%). Celle du reservoir de Mbakaou a ete la moins diversifiee (12 especes), avec quatre especes introduites devenues invasives et une predominance d’herbivores / detritivores (65,9%). Onze especes endemiques ont suscite un interet pour d’eventuels programmes de conservation des poissons dans le PNMD a cause de leurs habitats restreints et sensibles tandis que 13 autres, toujours endemiques et connues du bassin de la Sanaga, n’ont pas ete retrouvees dans la zone etudiee.Mots cles : Sanaga superieur, poissons, especes endemiques, especes invasives, habitats, gestion.   English Title: Diversity of the Djerem River ichthyofauna: impact of Mbakaou regulation dam and challenges for fish conservation in the Mbam and Djerem National Park (Cameroun)The intensive anthropization of the Sanaga river basin requires to accelerate research on biodiversity and conservation of its aquatic resources. In this context, the ichthyofauna of a part of the Djerem River has been studied with the aim to know its diversity and identify environmental factors that determine its distribution and conservation. Three stations were sampled from April to October 2015, they were located respectively upstream of the Mbakaou water reservoir, in the Mbakaou reservoir and downstream in the Mbam et Djerem National Park (PNMD). The Fish inventory followed by a taxonomic study and that of their habitats revealed the presence of 44 species belonging to 28 genera and 13 families. The ichthyofauna of PNMD with highest specific richness (33 species) was also devoid of invasive species, with a predominance of invertivorous (50,3%) and substratum egg-scatters (60,9%). The ichtyofauna of the reservoir with lowest specific richness (12 species) contained also four alien species, with a predominance of herbivores / detritivores (65,9%). 11 endemic species were concerned by the possible fish conservation programs in the PNMD due to their restricted and sensitive habitats while 13 other endemic species known from the Sanaga River basin were wanted in the study area.Keywords: Upper Sanaga, fish, endemic species, invasive species, habitats, management

international journal of biological and chemical sciences

Diversité de l’ichtyofaune de la rivière Djerem : impact du barrage de Mbakaou et enjeux pour la conservation des poissons dans le Parc National du Mbam et Djerem (Cameroun)