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The length-weight relationship and seasonal abundance of the indigenous Clariasgariepinus from Oluwa River, Nigeria was evaluated. The total length and the weight of the fish ranged between 31.70-70.70cm (mean of 51.76±3.04cm) 100.00-2,200.00g (mean of 1284.53±168.14g) respectively. All allometric coefficients (b) for length-weight relationship showed isometry and negative allometry patterns. Correlation Coefficient 'r' between length and weight of males, female and both sexes for year 2010/2011 was 0.80, 0.28 and 0.63 respectively while that for year 2011/2012 was 0.30, 0.60 and 0.26 respectively. The Correlation Coefficient (r) for length-weight relationships (LWRs) was near unity (0.80) for males during the 2010/2011 season. Those of females and both sexes were far from one (0.28 and 0.63) thus, did not show good length-weight relationship.Correlation Coefficient for LWRs was far from unity for males (0.30) and both sexes (0.26) while that of female was closer to one (0.60) for the second year. Males and both sexes did not show good fit to the line of regression and also did not show good relationship between the length-weight relationships in Clariasgariepinus in Oluwa River. This connotes that the fish species exhibited negative allometric growth pattern which may be caused by bitumen and other pollutants.

Seasonal variation and Length-weight relationship of Clarias gariepinus from Oluwa River, Nigeria