DOI: 10.36347/sajb.2014.v02i06.004

Pages: 380-383

The changes in the gonadosomatic index (GSI) of a catfish, Heteropneustes fossilis was studied for relation between seasonal variation in growth and reproductive cycle . The fish has only one spawning season of short duration, running from July to August as indicated by the peaks of GSI and the diameter of oocytes and testicular lobules. Both males and females mature simultaneously. The minimum GSI for female was 0.74±0.12 in resting phase and maximum was observed in the spawning phase (16.49±1.70). The GSI for males was minimum in resting phase (0.087±0.004) and maximum in spawning phase (2.02±0.181).