Some fisheries biological aspects for twoFish Species in KhashmEl. Girba Reservoir

Abstract

The data used in This study was collected fromKhashum El Girbaduring the period (November 2016 to December 2017) to show the variation in the total landings for major fish species, to estimate the length - weightrelationships O. niloticus and L. niloticus with the condition factor and to indicate the spawning seasons of O. niloticus and L. niloticus depending on the (b) values from the length - weight Relationships . The Total landings during study period show the highest landings during (Feb – May _ August) and the lowest landing during (November and December) The length –weight Relationship for (oreochromis and labeo niloticus) were estimated and they were (w=1.399L2.959) and (w=1.567L2.9) respectively.The condition factor were calculated) k=3.7 in O. niloticus – k=2.9 in L. niloticus) also they shows a significant difference less than p>0.05 that means all the above depended variable are affected by the species of the fish. The highest values for (b) values were found to be during (April _September and November) for O. niloticus and during (March and December) for L. niloticus this indicated that spawning season for two species are during (May)(November).