It's probably gasy, or flatulent. Try changing to another feed.
it stops swimming
Then Its Hungry.
a fishy
A shark.
it floats in the air and stops transmitting signals
They just swimmin about.
Water stops seeping into the ground when the the earth is fully saturated. No swimming pool should ever be emptied when this situation occurs.
Of course it is! just watch it!, the ball goes into red... stops and floats out again!
it tightens around the genatils and stops flappage wilst swimming
Oil gets their wings and stops them from flying or swimming, so it can be fatal.
after laying many eggs,it gets exhausted and stops for a while and again swims.
A dolphin's shape reduces the friction it encounters when swimming greatly, but it is still exposed to friction, and as a result will slow down if it stops swimming.