Because during summer, the surface of the water in the river or lake is usually hot and in the bottom of it is cold. Fishes tend to stay in the bottom area or at least in the middle (not sure with the middle) because it's colder there so they can live better.
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Answer:
Because during summer, the surface of the water in the river or lake is usually hot and in the bottom of it is cold. Fishes tend to stay in the bottom area or at least in the middle (not sure with the middle) because it's colder there so they can live better.