No status defined
Value of species
Future investigations may show that N. g. macrophthalmus from Caspian basin is a distinct species.
Black, Azov and Caspian Sea basins. Since late 1990s, invasive immigrant in rivers of northern Black Sea basin. In Danube up to Vienna (about 2000 km from sea), in Dniepr up to Belarus. Recorded in 1996 from middle Vistula in Poland, where it arrived from Dniepr via a navigation canal. Fast spreading in Vistula observed in 2002. Invaded Volgograd reservoir through Volga-Don canal.
Habitat: Mostly in freshwater and brackish water with low salinity (< 2 ‰). Estuaries, brackish- and fresh-water lagoons and lakes, large rivers up to small, fast-flowing streams, on sand or mud bottom. Mainly found in well vegetated or high-complexity habitats. Abundant in backwaters and still channels.
Biology: Lives up to 4-5 years. Spawns for the first time at two years. Spawns in April-June, occasionally until mid-August. Individual females may repeat spawning during a season. Usually spawns only for a single season. Adhesive eggs are deposited on stones, shells and aquatic plants. Males guard eggs until hatching. Feeds on a wide variety of invertebrates, especially molluscs.
- Соколов Н.Ю. Каталог колекції круглоротих і риб Державного природознавчого музею НАН України // Наукові записки Державного природознавчого музею. – Львів, 2004. – Т.19. – С. 15-28.