Question

❤❤❤❤why cant fishes survive in a closed container even though water has dissolved oxygen...♥​

Answer 1

fish can't live in closed container for long though it has oxygen resolved because ones oxygen dissolved is not enough for long time ones the oxygen gets over in the container the fishes die

Answer 2

Water has comparatively very little amount of oxygen (in dissolved form) than that of atmospheric air. But the oxygen will get dissolved repeatedly when the container is kept open so that the o2 level will be constant. So, if the container is closed, the oxygen remaining in the container will be used up by the fish and there will not be any oxygen in the container at some level. So, the fish ultimately die.