In this study, some reproductive characteristics of the yellow gooseberry, Upeneus doriae were investigated in Bandar Abbas coastal waters for a period of 8 months from July 2018 to February 2019. 300 fish specimens were selected from the bycatch fish of shrimp trawl. The samples were then transferred to the laboratory and the biometric data and some aspects of the biology of the fish were recorded. The results showed that male fish were more prevalent (53.3%) than females in trawl catch during the study period. The male: female sex ratio was significantly different in each month and in the whole period of study. According to the results of this study, it is expected that the spawning of this species begins in January. The fork length in which 50% of females reach sexual maturity is 10.6 cm.