Question

How would a fish maintain homeostasis and deal with a decrease in pressure and an increase in temperature in the surface of the water?  

Answer 1

Most fish body temperature's change with the temperature of the water around them. In order to obtain temperature homeostasis, the fish seek colder or warmer water. They lose metabolic heat through their gills. Cold-blooded animals must regulate their body temperature by moving.

Many fish have a gas-filled organ, called a “swim bladder,” that helps them maintain their buoyancy. ... Aspressure increases, the volume of a gas decreases; and, as pressure decreases, the volume of a gas increases.

Fish are unable to regulate their body temperature, so they are influenced by the temperature around them. If the water is warm, fish metabolism accelerates, feeding and respiration increases, and there is a general increase in movement. If the water is cooler, fish become lethargic and tend to be inactive.

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