Family: Salmonidae
Yamame — a Salmonidae from Japan, territorial toward its own kind; predatory on small fish. Reaches 15–30 cm; solitary or small groups; juveniles shoal. 8–18 °C.
Oncorhynchus masou is a Salmonidae from Japan. In the wild it prefers cold, highly oxygenated mountain streams; in the aquarium it stays territorial toward its own kind. Plan on 15–30 cm of adult fish at 8–18 °C. Related profiles: Oncorhynchus masou ishikawae.
Difficulty: moderate. Territorial toward its own kind; predatory on small fish. Solitary or small groups; juveniles shoal.
Hold 8–18 °C and keep it stable — 8–18 °C curated husbandry range. Chiller or cold-water management in summer.
Expect 15–30 cm as an adult, living bottom to mid-water in runs and pools. A 300 L tank or larger gives it room.
Carnivore; insects, crustaceans and small fish. Vary the menu — quality flakes or pellets plus frozen or live foods.
Territorial toward its own kind; predatory on small fish; solitary or small groups; juveniles shoal. Good company: Similar-sized peaceful community fish — Similar size and water needs. Keep away from Much smaller fish — May outcompete or bully tiny tankmates.
Native to Japan, where it lives in cold, highly oxygenated mountain streams. Strong current over gravel; Requires near-saturated dissolved oxygen.
A confirmed jumper: fit a tight lid and lower the waterline slightly.
Autumn redd spawner in flowing gravel. Males develop kype and brighter colours at spawning.