鱼的年龄,是根据鱼的鳞片、脊椎骨、鳃盖骨、胸鳍、脊鳍棘、耳石等测出来的。如比目鱼,是用脊椎骨推算年龄的,凶猛的鲨鱼,是用背鳍推算的;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。更多的鱼,是用鳞片来推算的。 怎样用鳞片推算鱼的年龄呢?经过千百年的实践,科学家们发现,鳞片仿佛树木的横断面,存在许多环纹,类似树木的“年轮”。环纹是怎样形成的呢?春夏季,食物丰盛,鱼类生长快, Fish’s age is based on the fish’s scales, vertebrae, operculum, pectoral fins, spine fin spines, otoliths and the like. Such as the flounder, is calculated from the vertebrae age, ferocious shark, is calculated using the dorsal fin; salmon, is calculated using the operculum; size of the yellow croaker, is calculated using the otolith. More fish, scales are used to calculate. How to scale the age of fish with scales? After thousands of years of practice, scientists found that the scale is like the cross section of trees, there are many rings, tree-like “annual rings.” Ring formation is how it? Spring and summer, abundant food, fast-growing fish,