Body growth and condition of endangered Tor putitora (Hamilton, 1822) (Actinopterygii: Cypriniformes: Cyprinidae) in the crucially important breeding and nursery grounds of the Ganga stock

Abstract

The study evaluates seasonal differences in length-weight relationship and relative condition factor (Kn) of Tor putitora in the Nayar, a critical breeding and nursery ground in the mountain zone of the Ganga. The growth coefficient of T. putitora varies seasonally between 2.86 and 2.99 while relative condition factor between 1.00 ± 0.06 to 1.061 ± 0.3. Mahseer shows negative allometric growth (except the monsoon season) with better condition factor throughout the study period. The present Kn factor for different size groups show deviation from past which may be due inadequate of food resources or excessive fishing in the Nayar.