To assess the effect of enhancement of black porgy () in Daya Bay. Plastic oval tags (POTs) were used to study marking technology in juvenile black porgys. The results of experiment on tag retention rate and growth showed that the back muscles, approximately 5 mm below the 4^th-6^th spine at the base of the dorsal fin, were the optimal tagging position; after 90 days, the POTs retention rate was 81.76%. There was no significant difference in growth between the tagged group and the control group after 45 days (>0.05), but the growth of the tagged group was significantly slower than that of the control group after 90 days (<0.05). Based on this technique, the release experiment in Daya Bay was carried out once a year from 2014 to 2016. The reward-recapture method was used to collect the tagged fish, and the body length and body weight of each recaptured fish was measured. Information such as the recapture date and place, and how the fish were tagged was gathered, and the relevant data were subsequently analyzed. In the period of 3 years, a total of 60115 tagged black porgy juveniles were released, and the tagged fish were mainly recaptured by set-nets, drift-nets, and through angling, with a total number of 2758 (total recapture rate of 4.59%) recaptured individuals. The recapture rate of the larger juveniles was higher than that of the smaller juveniles. The tagged fish that were recaptured through angling accounted for 62.08% of the total recaptured fish. An analysis of the gathered information showed that the released tagged fish juveniles primarily migrated radially to the inner and outer areas of the bay; the maximum migration distance was over 70 km from the release site. In 1-2 months after released, the growth of black porgys were relatively slow and then relatively accelerated. After 5 to 7 months, the body length and body weight of the black porgys increased by 59.51%-127.20% and 322.75%-989.83%, respectively. The results indicated that, POT was a potential choice for juvenile black porgy. In the study area, tagged black porgy were easier to be recaptured by angling after released. The abundant food and the space available to avoid the enemy were the factors which influenced their distribution and growth.