Salmonids elicit an acute behavioral response to heterothermal environments.
Naudascher R; Brizzolara S; Slomka J; Boes RM; Holzner M; Silva LGM; Stocker R
Fish like brown trout can control their body temperature by moving to different water temperatures. In a study, these fish quickly moved away from cold water but were okay with swimming into warmer water. This shows how fish can handle changes in water temperature by changing their behavior.