Abstract: From August 1988 tc July 1989, attaching organisms in the fish reef area of Daya Bay were investigated. 79 species were recorded. About 82.7% of these are bait organisms of fish and shrimps in the fish reef area, including35 species of nonshelled and 32 species of shelled bait organisms. 17.3% of the species are not bait organisms. The attaching organisms in the fish reef area were numerous in species, large in biomass and grew rapidly. Half a year after the reefs were cast, they were 100% covered by the organisms, with the thickness 30mm and the biomass reaching 17.487 kg/m², The reproduction and attachment of attaching organisms in the reef area occurred all the four seasons of the year. The major attaching period was July, August and September, which can be selected as the best period for the cast of the reefs.

Key words: Attaching organism, Artificial reef