Assessment and Production of Characid Fish at White Nile River

摘要

This study was conducted from November 2007 to October 2008 at two main fishing sites in Jebel Aulia Reservoir, which were Jebel Aulia site 45 km south Khartoum city and Kosti site about 355 km southward Khartoum city. This study concentrated on two genera family Characidae, which were Hydrocynus forskalii, Hydrocynus lineatus, Hydrocynus brevis, Alestes baremoze, Alestes dentex and Alestes nurse. The results were analyzing using standard approaches and advanced computer programmes (PAST and FISAT II FAO-ICLARM). The estimated productivities were 77.02 kg/km~2 at Jebel Aulia and 499.71 kg/km~2 at Kosti site, respectively. Nevertheless, fishing effort in Kosti nearly is double Jebel Aulia site by using one type of fishing–net during period for fishing. For genus Alestes in Jebel Aulia site, exploitation ratio was between 0.52 and 0.90, while that for genus Hydrocynus was between 0.60 and 0.70. In addition, in Kosti exploitation ratio for genus Alestes was between 0.37 and 0.54, and that for genus Hydrocynus was between 0.41 and 0.58. The recommended exploitation ratio level was 0.5.