Condition factor, size distribution and length-weight relationship of the Claroteslaticeps (Claroteidae) in the lower River Niger

Abstract

Samples of Clarotes laticeps were collected biweekly for a period of 36 months (January, 2010 to December, 2012) from the lower reaches of the River Niger. The fish samples were taken to the Fisheries Laboratory of the Delta State University, Asaba Campus, where they were sexed, measured, weighed and grouped into 12 size categories. From the data gathered, the length- weight relationship and condition factor (K) were determined for males, females and the combined sexes. A total of 1650 specimens comprising of 978 males and 672 females was collected during the period. Size composition of collected samples showed that the population was dominated by juveniles and medium size fishes, with fewer larger specimens. The length weight relationships established for the population of C laticeps studied were; log w= 3.13 logl-1.89 (l= standard length), log w= 3.15 logl-1.86 and log w= 3.14 log l-1.88 for males, females and combined sexes, respectively. Mean Condition Factor values for the different size categories ranged from 1.77 – 2.49 for males, 1.76- 2.64 for females and 1.76- 2.51 for combined sexes. The K values obtained for the sampled fish population indicate good condition for the population of Clarotes laticeps studied. This is an indication of well-being and health status of the population. In addition, the size composition of the population showed that it has potential for growth.