Central Baltic herring (subdivisions 25–29 and 32) are mixed in the Gulf of Riga herring in the Gulf of Riga area (subdivision 28.1). Additionally, it is known that the Gulf of Riga Atlantic herring is caught in the Central Baltic Sea Area (ICES 2017)(ICES 2017). The Gulf of Riga herring stock does not perform significant migrations into the Baltic Proper; only a minor part of adult herring leaves the Gulf after the spawning season in the summer-autumn season, and return later. There is evidence, that the migrating fishes do not perform longer trips. The extent of this migration depends on the stock size and the feeding conditions in the Gulf of Riga (ICES 2023).