Most brown trout populations will spawn between September and December, as their eggs and juveniles need plenty of cold, oxygenated water to survive. Their optimal spawning temperature is between 43 and 53F (5 and 12C).
Brown trout (Salmo trutta) can reach a weight of about 45lb and a length of 45 inches. Their average size is between 1 and 5lb and 10 and 20 inches.
Juvenile brown trout primarily feed on zooplankton, aquatic and terrestrial insects, and larvae, while adult brown trout predominantly feed on other fish and crustaceans. Both egg and fry cannibalism are relatively common in this species and can be a considerable cause of small-fish mortality.