This paper deals with the feeding habit of different developmental stages from fry to juvenile of T. rtida.The morphological characteristics of the teeth on both the upper anal lower jaws and of pharyngeal teeth, gill rakes, gut and digesitive glands are observ ed.Bexnatically The niorological changes of the digesitive orgin regard to the variation of the feeding habit is examined, aced also the feeding habit, of T.raiboca during each development stsge and guts contents hat-o bean analysed.