Study of determination some of the reproductive biology properties of the Largescale Tonguesole, Cynoglossus arel (Bloch and Schneider, 1801), in the Persian Gulf (Boushehr Coastal Waters)

Cynoglossidae family، including 5 species in the Boushehr Coastal Waters، has high distribution. Cynoglossus arel is considered as a benthic fish with high quality meat and marketable. In the survey، 287 specimens were monthly collected from fishery ports and evaluated their breeding. Gonadsomatic index، Hepatosomatic index، absolute fecundity and condition factor were measured. In the study، rate of absolute fecundity was taken and fecundity relationship with length (r =0. 86) and weight (r =0. 90) had high correlation. In female، Gonadsomatic index rose from October and reached to maximum amount in December but in male، Gonadsomatic index increased from September and had picked in April. Female condition factor value in comparison with male had near relationship with size of sexual organ and this coefficient had the minimum rate in breeding time (April). Overall، this study showed that breeding season of fish has continued from April to July that lack fishery activity in breeding seasons is recommended for return fisheries.