Spatio-temporal variations in length-weight relationship and condition factor of two notopterids, Chitala chitala (Hamilton, 1822) and Notopterus notopterus

Abstract

Length-weight relationship and condition factor of Chitala chitala (Hamilton, 1822) and Notopterus notopterus (Pallas, 1769) were studied from 439 samples of C. chitala collected from 14 locations and 368 samples of N. notopterus colleted from 19 locations in Indian rivers. The regression coefficient ranged from 2.24 (River Gomti) to 3.24 (River Son) in C. chitala and 2.34 (River Son) to 3.71 (River Krishna) in N. notopterus. Fulton's condition factor and relative condition factor were found to be greater for N. notopterus than C. chitala in common sites of collection. Spatial variations indicated better biological behaviour for C. chitala in River Son and for N. notopterus in River Chambal. The results of the study form important baseline information for developing sustainable management and conservation measures.