Tolerant to acidity
Diverge from Finnish original salmon-species and rainbow trout, brook trout tolerates well water with acidity. It subsists even in pH 4,1 water. Also tolerance of cold is high.
Food taking
Brook trout is a resilient food taker. It accepts larvae of water fauna, bottom fauna and small fish.
Spawning
Brook trout spawns in autumn. Spawning takes place at gritty bottoms in flowing water. After spawning brook trouts usually stay in flowing water and wander to the lakes or to the sea not until spring.
Size, importance
Brook trout don't grow big. Yet ones weighting a kilo are rare. Anyhow brook trouts are considered good fighters with hook in their mouth, so it has a recreational value.
Finnish record brook trout is at the time of writing 2,73 kg and was caught from good brook trout stream Piehinkijoki river of Raahe.
Sources:- Koli, Lauri, Suomen kalat
- Brook trout (RKTL:n kala-atlas, in finnish)