Annual rings on scale, otolith, cleithrum, opercular and basioccipital of Megalobrama pellegrini were detected on 167 individuals collected from the Longxi river, Luzhou, Sichuan Province. The result shows that the definition of the annual on scale, otolith, cleithrum, opercular and basioccipital is high. Age agreement based on scale and basioccipital bone is 95 5%. Correlation between the diameter of basioccipital and body length is linear. So is correlation between the diameter of scale and body l...