According to the information released by public comments, the best time to catch red fish in Hainan is May, and the rapid growth period of red fish is from May to September, with the specific growth rate of average body length 13% and average weight of 46%. During this period, the monthly water temperature changed from 29.5 degrees Celsius to 32 degrees Celsius.

Red friend fish generally refers to purple snapper, belonging to snapper family and snapper genus.