Abstract
This study investigated the length-weight relationships and condition factors of three fish species in an abandoned gold mine reservoir. The fishes were caught on monthly basis between August 2015 and July 2016 using gill nets and traps. The results showed that Coptodon zillii, Oreochromis niloticus and Sarotherodon galilaeus had a mean total length and mean weight of 15.52±4.64 cm and 95.80±66.27 g; 15.27±4.18 cm and 89.54±63.20 g; 15.57±4.80 cm and 102.0±85.81 g respectively. Also, the mean condition factor obtained for the fish species are 2.24±0.52 in C. zillii; 2.26±0.62 in O. niloticus and 2.27±0.46 in S. galilaeus. Similarly, the slope (b) values and correlation coefficient for the three fish species are 2.018 and 0.969 for C. zillii; 1.977 and 0.926 for O. niloticus and 2.436 and 0.965 for S. galilaeus. Furthermore, the total length, weight and condition factor between C. zillii, O. niloticus and S. galilaeus differ significantly (p>0.05). The study concluded that despite being an abandoned gold mine reservoir, the environment is well suitable for the fishes.
Highlights
The Cichlidae family is the most rich in species fish family in inland waters worldwide
The total length values recorded for fish species varied with respect to size and age
The total length of C. zillii varied between 8.1 cm and 25.1 cm
Summary
The Cichlidae family is the most rich in species fish family in inland waters worldwide. The length-weight relationship study is widely used in the management of fisheries since it gives information on fish condition (Bagenal and Tesch, 1978). This relationship plays an important role to determine the weight from the length of a fish and to compare the mean associated parameters between fish groups spatially (Muzzalifah et al, 2015). Length-weight relationship and condition factor of fish have been well documented in other inland water bodies of Nigeria (Adeyemi, 2010; Dankishiya, 2013; Amoo and Komolafe, 2016). The parameters of length-weight relationship are important in fisheries to determine the weight of an individual fish from its length, to compare the life history and morphology of populations in different areas (Sani et al, 2010)
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