This review article set out the inventory of the various scientific and technical contributions on the biological and zootechnical parameters of the catfish Clarias gariepinus. Several years of research shows that Clarias gariepinus is of great importance in fisheries and aquaculture in Africa and around the world, judging by the wealth of knowledge produced. The information provided in this review was collected from scientific articles, books and handbooks, technical reports, thesis, dissertations, and proceedings. The authors, through an inventory of the various scientific and technical contributions from 1971 to 2017, reported the biological characteristics of C. gariepinus, its diet and nutrition, its reproduction, its growth performance, its breeding systems and devices and some diseases to which it is subject. The biological characteristics of the African catfish were analyzed based on its description, taxonomic classification, habitat, ecological requirements and geographic distribution. The diet of the species has been addressed within its natural environment, in rearing and through nutritional needs and constraints. Reproduction of the species includes, age at first sexual maturity, incubation

P r o f o C f o r d e r Z o o l o y i e rlin n n r u i h i l i o r. hTuTeu.m i n P a r i s. ") Sritciem man fich aufs neue ro eifrig mit Unterfuchungen uber die Galvanikhen Erlcheinungen he-Ehaftigt, mufs eine genauere Kenntnifs der Organe ei n j ge r Fi Ic h e , we 1 c h e elect I' i k h e Eig e n fc h a ft e n zejgen , vorziiglicti intereffant leyn. Man route glauben, dafs T h i e r e , die i n riner To aufserordentlichen Eigenkhaft iibereinkommen , fie einer i h nlichen O r g a d a t i o n vercianken , und daher alle fehr nahe verwandt feyn oder zu Einer Farnilie gehiiren miifsten. Dies ifi aber nicht d e r Fall. Vielmehr geh6ren die electrilchen Filche zu fehr verfchiedencn Gattungen, nirnlich zu denen Raja, Terrad o n , Trichiurus, Gymnorus u n d Silurus, von der e n jedem wir eine A r t k r n n e n , die electrifch ift. Urn diefe grofse Verfchiedenheit d e r Filche, die Gch von denrn gleiclier Crattung durch die Gegen

No abstract