char; charr; Japanese char
A freshwater fish of the salmonid family, often found in cold mountain streams. In Japan, typically refers to Salvelinus pluvius.
Char live in cold mountain streams.
The angler caught a char.
ニジマス is rainbow trout, another cold-water fish, but not native to Japan and more commonly farmed.
Katakana spelling is common and It is usually written in kana.
Kanji spelling; less common than kana but still encountered.
Rarely used kanji form.
The name イワナ likely derives from 岩 (iwa, 'rock') + 魚 (na, old form of 'fish'), referring to its habitat among rocks in clear streams.