Cultured Cobia performs attributes of inbreeding after several generations, includingprecocity, retarded growth and low disease resistance recently. The cobia juvenile issusceptive to Photobacterium damsela subsp. Piscicda, leading to low survival rate at seafarmedstage. This project aims to realize the reproductive behavior of wild juvenilerearedbrooders in order to produce their progeny largely and analyze theirmorphometric traits. The traits of precocity and disadvantages of retarded growth andlow disease resistance of inbreeding cobia are also expected to be solved. Furthermore,the mass production of high-quality fertilized eggs and fry will be conducted.