The fish spawning ground had been investigated on the Beijiang River near Shaoguan city and the influence on fishes breeding from 7 dam had been estimated.Main result are as follows:the four dam building and designed will result in a big destruction.including disrupt the fish migration(Mengli Dam and ChangshanDam),the fish spawning ground disappear(below Zhangtan Dam).a huge destruction in Ankou fish spawning ground by Changan Dam and a serious of damage on grass lying -egg species will caused by Wantou Dam,especially for catifish Mystus suttatus.On the other hand Zhangtan Dam,Kongiiang Dam,and Menzhou Dam obstructed the fish exchange between upstream and lower stream,however a large water surface became before the dam supported a better condition for fish growth,it seems balance in positive and negative action.The conclusion is that those dam building or designed would be stop or delay in order to maintain fish population and aquatic ecological balance.
