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This study evaluated the gender ratio in Clarias gariepinus production from five different populations. 300 Juveniles fish each were sourced from five (5) fish farms. The fish were grouped based on the farms into five populations (i.e. treatments) and were replicated thrice with each replicate stocked with 100 fish in a square shaped experimental plastic tanks of 1m x 1m x 1m. Data obtained from the experiment were subjected to one-way analysis of variance. Significant differences (p<0.05) were recorded in the values of final weight, mean weight gain, specific growth rate, percentage survival and daily growth rate. The malefemale ratio showed that the females were more in number compared to their male counterpart. There was no significant difference in the number of males, number of females and weight of males across the populations. The female C. gariepinus in population 5 had the highest value (246.41±2.73g) of final weight while those in population 3 had the least value (205.95±13.17g) of weight. The fish in population 2 displayed a better growth curve compared to other populations while fish in population 3 displayed the least curve. The curve revealed that the fish grows at almost the same rate from day 0 to day 42 after which their growth pattern changed. This study showed that the number of female fish in any production outweighs the number of males.

Sex distributions and growth response in different populations of catfish (Clarias gariepinus)