鱼的年龄,是根据鱼的鳞片、脊椎骨、鳃盖骨、胸鳍、背鳍棘、耳石等部分推测出来的。如我国沿海产的比目鱼,是用脊椎骨推算的;凶猛的鲨鱼,是用背鳍推算的;我国东北产的大马哈鱼,是用鳃盖骨来推算的;大小黄鱼,是用耳石来推算的;还有许多鱼,则是用 Fish’s age is based on fish scales, vertebrae, opercle, pectoral, dorsal fin spine, otolith and other parts presumed. Such as the flounder of our coastal production is calculated using the vertebrae; fierce shark, is calculated using the dorsal fin; salmon produced in northeast China is calculated using the operculum; size of the yellow croaker, is calculated using the otolith ; There are many fish, it is used