The Polish Angling Association in Białystok has three fish pond complexes: Cegielnia, Krasne-Komosa and Bachury. It has a hatchery for freshwater and predatory fish “Pstrągownia” in Supraśl and field hatchery in Zakład Rybacki Siemianówka. In these facilities 17 species of fish are hatched for restocking: pike, European catfish, burbot, perch, brown trout, grayling, asp, ide, chub, barbel, carp, tench, crucian, grass carp, roach, European whitefish, Baltic whitefish.