Water Breathing. The trout can breathe only underwater.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:4 (1d4 + 2) piercing damage.
Tail. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:4 (1d4 + 2) bludgeoning damage.
The tasty and tenacious knucklehead trout can't easily be caught in nets. Moreover, using a line to reel in such a strong fish is a significant undertaking. Incautious fishers who get pulled into freezing water can quickly die, particularly if they're weighed down by heavy furs and cloaks.