ing experiment was conducted for a 12 weeks period to investigate the effects of die t.ar y t.ricalcium phosphate (TCP) Oll young red sea bream in a spects of growlh, fee d utili zation and hOllt' mineralization. The fish fed t. he diet. wit.h a low level (0.2%) of Ca supplement from TCP (die t 2) showed growth similar to the fis h fed 0.2% Ca from Ca- Iac tate (diet I). Fish fe d the die t \\·i t h a high level (2 .fJ% ) of Ca supplement fr om TCP (diet 3) showed sign ifican tly poor grov.-th than the fi sh fed diet I . Feed effidcney and condi tion factor were lower in the fi sh feu diets 2 and 3 compared to diet J . TCP ill (he dif' t' 2 a nd :l decreased the Zn content of bonc. These results inuicate that indll sinn or a high le ve l of TCP to the puri fi eu oie t decrcases the gro\\th, feed erficiency and Zn content of bone in red sea bream.