keywords: Allometry, diversity, Eleyele, freshwater, gastropods, snails, length-weight
The study centered on the population and length-weight relationship of gastropods from 5 sampling points at River Eleyele. Gastropods samples were collected from November 2010-April 2011. A total of seven (7) species were recorded, these included Melanoides tuberculata (Thiaridae), Biomphalaria pfeifferi (Planorbidae), Lymnaea natalensis (Lymnaeidae), Physa marmorata (Pysidae), Gabriella senegalensis, Gabriella Aafricana (Bithynidae) and Lanistes varicus (Pilidae). Melanoides turberculata was the most abundant (84.62%) followed by Biomphalaria pfeifferi with 7.69%. The value of b in the regression analysis for Planorbidae was significantly higher than 3 (p<0.05) which showed a positive allometry growth while b was significantly lower than 3 in the other organisms indicating a negative allometry growth. High degree of positive correlation between the total length and total weight was indicated by high values of the correlation coefficient (r) in all organisms (Thiaridae, r = 0.6883; Planorbidae, r= 0.9073; Lymnaeidae, r= 0.9894; Bithynidae, r=0.9790).