Biologie de la reproduction du Cyprinidae, Barbus callensis dans le lac de barrage Hamiz (Algérie)

Reproductive Biology of the Cyprinidae, Barbus callensis in an Algerian Dam. The freshwater fish, Barbus callensis (Valenciennes, 1842) was studied from 2005 to 2007 for the first time in Hamiz dam. This species endemic of North African continent is widely spread in the rivers of Algeria. This reservoir is situated in Boumerdes 35 km southeast of Algiers. During these three years, the monthly sampling was carried out by trammel nets, fishing near the dike during one night. At the same time, the fry was captured with a transparent plastic bottle baited with breadcrumbs put down near the lakeshore. The monthly follow-up of the gonadosomatic ratio (RGS) reveals that the spawning period occurred between April and May. The evolution of the condition factor (K) shows low seasonal variations. However, a lower value appears in spring when the temperature increases and the breeding begins. The sex ratio is higher for the adult females (1:2.8, more than 26 cm). The first sexual maturity size (L50) is lower for males (19.6 cm) than for females (27.7 cm).