The present study has been carried out to study length-weight relationships (LWRs) and condition factor (K) of
renowned and highly commercial freshwater major carp, thaila (Catla catla) from farming system. Mean±S.E. total
length (TL) and body weight (W) of studied samples have been calculated as 39.29±0.23 cm and 827.43±14.55 g,
respectively. For LWRs, specimens of C.catla were collected from fish ponds and grouped into three categories on
the basis of the feed offered to them which contained 15%, 20% and 25% crude protein (CP). The regression
estimates for LWRs were highly significant (P <0.001) with coefficient of determination, r2-values being >0.930 in the
three studied groups and for overall data. The value of the regression coefficient (b) indicated negative allometric
growth (b= 2.87), isometric growth (b= 2.95) and positive allometric growth (b= 3.22) for fish fed 15 %, 20 % and 25
% crude protein respectively, and 3.04 for overall data. The results of the present study will contribute to the proper
management of this species in the farming system and can be used to fill a gap in the current knowledge in this area.