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cooler water has more dissolved oxygen: hot water has hardly any at all.

Oh, so they go to the bottom to get oxygen. Why does cooler water have more dissolved oxygen?

Generally gases are more soluble in cold water than warm water. Think of an open coke can in the refrigerator versus one left out in the sun. Which will go flat faster. The one in the sun because more CO2 comes out from a hot solution than from a cold solution.

thanks

thanks

Why do fish seek out the bottom of lakes on hot days?

Okay, I'm not exactly sure about this but I think it has to do with because it is cooler at the bottom. Does it have something to do with density or solubility or what?!

Fish may seek out the bottom of lakes on hot days because the water at the bottom tends to be cooler. As you mentioned, gases are more soluble in cold water. This means that cooler water can hold more dissolved oxygen than warmer water. Since fish need oxygen to survive, they seek out areas with higher oxygen levels. In many bodies of water, the deeper layers are often cooler due to factors such as water circulation and shading from sunlight. As a result, the bottom of lakes can provide fish with a more suitable temperature and higher dissolved oxygen levels compared to the warmer surface layers.