After 20 century 70s, fishspeciescomposition significant changed on the basis of the speciescomposition of fish-scale-deposition.
通过鱼鳞种类组成比例的改变，发现上世纪70年代后，鱼类资源结构发生了显著的变化。
2
According to the data selected from bottom trawl fishery resource monitoring in the East China sea from 1997 to 2000, the speciescomposition and seasonal variation of small-sized fish were analysed.
The results indicated that except reef fish, the seasonal changes of fishery speciescomposition in seaweed bed (SB) were much more obvious than those out of the seaweed bed (OSB).