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Temperature Check
Although these data can vary from population to population, here is a general field-guide reference to trout and water temperature (in degrees Fahrenheit).

Brook Trout (Salvelinus fontinalis)
Survival: 33-72
Optimal: 55-65
Spawning: 40-55

Brown Trout (Salmo trutta)
Survival: 33-78
Optimal: 55-60
Spawning: 45-55

Rainbow Trout (Oncorhynchus mykiss)
Survival: 33-80
Optimal: 56-70
Spawning: 41-59
Source: "Trout" by Stackpole Books; special thanks to biologist Brian Bennett. Read more – offline – from the current issue; subscribe to FRR.