Answer :
Gases are less soluble in warm water, which means that the oxygen leaves the water and the fish dies. Cold water keeps oxygen in for longer.
Due to high amount of dissolved oxygen in cold water, goldfish have a better chance of survival.
what is dissolved oxygen?
Dissolved oxygen is the amount of oxygen that is present in the water bodies.
As dissolved oxygen is very much important for the aquatic animals because their survival depends on the water. When we increases the temperature of water then the amount of dissolved oxygen decreases which cuts off the supply of oxygen to the aquatic animals. That's why every aquatic specie has a better chance of survival in the cold water, due to presence of the abundant dissolved oxygen.
Hence, goldfish has a better survival in cold water because of dissolved oxygen.
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