Growth determination of selected fish species (Oreochromis niloticus, Coptodon zillii, Brycinus nurse and Mormyrus rume ) was carried out in Lake Alau. The aim was to find out the growth pattern of the purposely selected fish species. A total of eighty samples of the four different fish species were purchased from the commercial fisher forks in lake Alau and were carried to the fish biology laboratory for the growth analysis. Scales were for growth assessment and morphometric parts were measured. The data collected were analyzed using standard method. The results for length - weight relationship indicated that the coefficient of correlation (r) calculated for the four (4) different species were 0.8102 , 0.3282 ,0.8289 and 0.8121 respectively . Which indicates that the growth correlation between the length and the weight of Oreochromisniloticus ,Brycinus nurse and Mormyrus rume were slightly strong while Coptodon zillii showed weak correlation . Exponent (b) value obtained for the species were 0.1711 , 0.1392, 0.1685 and 0.1685 respectively . The result shows that all the four species show negative allometric growth which means the pattern were not uniform throughout the body.
Keywords: Growth, Fish age, Fish species, morphometric, strong correlation, exponent Introduction