A study was conducted on gonadosomatic index (GSI) of a Teraponid species, Terapon jarbua collected from Karachi coast. The fish sampling was carried out from January 2013 to December 2014. A total of 676 specimens of T. jarbua were collected during the study period. The values of gonadosomatic index (GSI) for males ranged from 0.51 to 1.85 during 2013 and 0.47 to 1.61 during 2014 whereas the values of gonadosomatic index (GSI) for females ranged from 0.89 to 3.12 during 2013 and 0.90 to 3.86 during 2014. During he study, the higher values of gonadosomatic index were observed in April and July, showing one spawning season of T. jarbua.
