Data of clam species in Nigeria have not been properly documented. Hence this research study the identify species of clam in Nun River with Morphological criteria: Samples were harvested monthly and taken to the laboratory for identified and Morphometric measurements. Six species where identified (Alasmidonta undulata , Anodonta implicate, Elliptio complanata , Lampsilis cariosa , Stophitus undulates and Toxolasma parvum) belonging to the family of Unionidea. Mean length-weight of clam shows, Stophitus undulatis had the highest significant mean weight (124.01 g) and mean length (8.53 cm). The least mean weight (73.94 g) and mean length (6.83 cm) was in Alasmidonta undulata . The growth patterns and condition factor of Clam from Nun River showed negative allometric growth for all clam species, except Toxolasma parvum which had positive allometric growth with highest ‘b’ value (3.259) among species. The re was significant different (p<0.05) among species condition factor. The correlation coefficient ‘r’ recorded the highest (0.97) in Anodonta implicata and least (0.75) in Stophitus undulates. However, there was strong positive relationship between length - weight and condition of Clams species in the Nun River.
Keywords: Clam, Species composition, aquatic environment, ecology, conservation