Length-Weight Relationship and Condition Factor of Six Fish Species of Donia Reservoir, Nasarawa State, Nigeria

This study examined the Length-weight relationship and condition factors of six species of fish of Doma Reservoir: Sarotherodon galilcieus, Tilapio zilli, Oreochromis niloticus, Hemichromis fasciatus, Hyperopisus bebe and Glorias gariepinus. A fleet of gillneys made up of seven multifilament nets of 38.1mm, 57.15mm, 76.2mm, 101.6mmm, 127.0mm, 152.4mm and 177.8mm were used to sample the fish in reservoir. The fish species studied exhibit allometric growth pattern. Sarotherodon galilaeus and Tilapia zilli exhibit negative allometric growth with b= 2.847 and 2.929 while Oreochromis niloticus, Hemichromis fasciatus, Hyperopisus bebe and Clarias gariepinus exhibited positive allometric growth with b= 3.089, 3.378, 3.115 and 3.258. The correlation coefficient (r) value which ranged between 0.979 and 0.985 indicated high degree of correlation. Condition factor analysis also show that Sarotherodon galilaeus, Tilapia zilli, Oreochromis niloticus and Hemichromis fasciatus have value greater than 1 indicating that they were in good health conditions while Hyperopisus bebe and Clarias gariepinus have value less than 1 indicating that they were not in good health condition.