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ABSTRACT
A morphometric study to assess the length-weight relationship, condition factor and sex ratio of two (2) freshwater fishes namely Auchenoglanis monkei and Chromidotilapia guentheri, belonging the to the families Bagridae and Cichlidea respectively was conducted in Ikpoba River, Edo State, Nigeria for a period of 6 months, March, 2023 - August, 2023. Morphometric measurements such as Total Length (TL), Standard Length (SL), Head Length (HL). Body Depth, (BD), Body Weight (BW) were taken and recorded for each specimen in the Laboratory. The range of the total length and body weight of Auchenoglanis monkei ranged from 10.3-14.1 (cm) and 20-45 (g) respectively, while that of Chromidotilapia guentheri ranged from 9.1-16.1 (cm) and 20-55 (g) respectively. The length-weight relationship showed that the species weight were relatively highly regressed on length (p > 0.05) with coeffiecient determination (R2 ) and the correlation coefficient (r) being 0.2644 and 0.51422 respectively for Auchenoglanis monkei while 0.5758 and 0.75884 respectively for Chromidotilapia guentheri. The growth coeffeicient (b) was for Auchenoglanis monkei and Chromidotilapia guentheri respectively. There was no significant difference (p < 0.05) in k-factor of the specimens sampled across the duration of the study for both species. The mean sex ratio for Auchenoglanis monkei and Chromidotilapia guentheri was recorded to be 1.44:1 and 2.12:1 respectively. The result shows that both species exhibited negative allometric growth. The mean condition factor (K) values across the sampling duration were all greater than 1.0 for both species, indicating thatthe fishes were in a good condition.
