Population dynamics of Cirrhinus mrigala (Hamilton 1822) from the largest tributary of the Ganga River, India

Abstract

The present study covenant with stock assessment Cirrhinus mrigala. Length frequency data was collected from lower stretch of the river Yamuna at Allahabad during August 2011 to July 2012 and length ranging from 168 to 943 mm. The asymptotic length (L¥) and growth coefficient (K) were estimated at 998 mm and 1.339yr-1, respectively. The total mortality (Z), fishing mortality (F) and natural mortality (M) were estimated as 4.01 yr-1, 0.786 yr-1 and 3.226 yr-1, respectively. Exploitation rate (E) and exploitation ratio (U) were found 0.8044 yr-1 and 0.7898 yr-1 respectively. The population structure of C. mrigala varied from 0+ to 10+ age groups from the Yamuna River at Allahabad. The male population was dominated in 0+, 1+ and 2+ age groups.