Hatchery “Dole” is the only specialised vimba fry breeding place in the basin of the Baltic Sea. The hatchery also breeds whitefish and lamprey fries as well as pike maggots. Fries of steelhead trout are cultivated for the needs of private hatcheries and pond owners. Starting from 2017, the hatchery also breeds pike fries. Currently, the hatchery releases at least 170 000 Baltic salmon smolts and fries, 420 000 vimba and whitefish fries, and 5 000 000 lamprey and pike maggots in the basins of rivers Daugava and Lielupe annually.