POPULATION DYNAMICS OF CICHLID FISH SPECIES OF OPI LAKE, NSUKKA. ENUGU STATE, NIGERIA.
Studies on the population dynamics of cichlid fish species in Opi lake were carried out between August, 2014 and January, 2015. Also, physico-chemical parameters of the lake were analyzed using appropriate methods. Morphometric relationships and seasonal variations of the fish species were determined. A total of 235 cichlid fish, comprised of 5 species, namely: Tilapia zillii (28.09%), Sarotherodon melanotheron (51.49%), Oreochromis niloticus (14.04%), Pelmatochromis guentheri (5.96%) and Hemichromis fasciatus (0.43%) respectively were sampled and used for the study. The above listed cichlid fishes showed no correlation (P>0.01) and (P>0.05) with values of the physico-chemical parameters determined. S. melanotheron however, showed positive correlation (P<0.05) with phosphate. The fish species sampled showed that there were more females than males. ……………………….