IUCN: VU; EUHD (V); RDBUkr: Зникаючі
Value of species
Restricted to seven streams of the Crimea (Black and Azov Sea basins).
Widespread, from mountain streams with strong current to brackish stream estuaries. Prefers river stretches at 100-600 m above sea level.
Males reproduce for the first time at two years, about 65 mm SL, females at three years, about 100 mm SL. Moves upstream into upper reaches, or near rapids to spawn on gravel or rock bottom. Females lay eggs in 1-3 portions. Eggs are non-sticky and lie among or under pebbles until hatching. At beginning of winter, moves to deeper places with less current and stops feeding. Feeds mainly on zoobenthos.