Seasonal variation of the composition of the nekton group was obvious, but for the demersal fishes and the pelagic fishes, their species composition varied with time.
Seasonal variation of the composition of the nekton group was obvious, but for the demersal fishes and the pelagic fishes, their species composition varied with time.
游泳生物组成的季节变化明显 ,但对于鱼类的底栖类群和中上层类群则存在着时间上的差异