Question

If aquarium owner on a cold day put a heater in his aquarium to keep the water warm but not hot but all his fishes die what would be the reason for this

Answer 1

The heater is an electric device which produces electric current in water when body of fishes came in contact with current they died..

Answer 2

Fish are cold-blooded animals and do not have constant temperature like human beings and cannot live in hot water or warm water because when we heat water the oxygen dissolved in water tend to escape as bubbles