HomeFish encyclopediaRay-finned fishesMulletsMulletsSo-iuy mullet So-iuy mullet (Mugil soiuy) Scientific name: Mugil soiuy Basilewsky, 1855 The So-iuy mullet (Mugil soiuy) is a freshwater fish of the family Mugilidae. Native range: Asia, Peter the Great Bay (Russia and Korea) and China. Europe: Black sea, introduced in the Mediterranean. BiologyVery common in the rivers discharging into Peter the Great Bay; enter freshwater. Large concentrations of fry-of-the-year measuring 3.1-6.2 cm in the mouths of rivers in August. Length in the Black Sea is usually 20-30 cm but may reach 43 cm; length in the Atlantic Ocean may reach 50 cm. Oviparous, eggs are pelagic and non-adhesiveSource: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameMugil soiuyFamilyMugilidae (Mullets)OrderMugiliformes (Mullets)ClassActinopterygii (Ray-finned fishes)Maximum length80.0Common length40.0Depth range5 m (16 ft)EnvironmentMarine; freshwater; brackish; demersal; catadromous; depth range 5 - ? mClimateTemperateDistributionAsia: Peter the Great Bay (Russia and Korea) and China. Europe: Black sea, introduced in the MediterraneanConservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: highly commercial; aquaculture: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (K=0.2; tm=3-5; Fec=2 million) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026