Question

dissolved oxygen
water temperature
dissolved oxygen is crucial for aquatic life, as most creatures need it to breathe in water. the suitable levels of dissolved oxygen vary depending on the species. for instance, trout and salmon need around 10 parts per 1,000,000 or more. some fish, like gar, can adapt to almost no dissolved oxygen by breathing air directly from the atmosphere. there are factors that can affect the amount of dissolved oxygen in the water including water temperature, water movement, and aquatic life.
the water temperature affects dissolved oxygen. higher temperatures lead to less dissolved oxygen in the water. fish move to find suitable dissolved oxygen levels, typically going deeper into cooler waters during hot seasons. pelicans use these thermal changes to their advantage, waiting near deeper - water outlets to locate fish.
during hot seasons, where do fish typically move to find higher dissolved oxygen levels?
deeper into cooler water
closer to the shallow areas
just at the water surface
toward the waters surface

Explanation:

Higher water temperatures in hot seasons reduce dissolved - oxygen levels. Deeper water is cooler and typically has higher dissolved - oxygen levels. So fish move deeper into cooler water to find more oxygen.

Answer:

deeper into cooler water