Łowisko Cztery Stawy Knopin

Commercial/paid fishery (łowisko komercyjne) marketed as "Łowisko Cztery Stawy Knopin" / "Dolina Czterech Stawów" — a complex of four ponds (~40 ha of natural terrain) by the Łyna river, ~2-4 km south of Dobre Miasto in gmina Dobre Miasto, powiat olsztyński. Multiple ponds with differing character (one shallow ~1.5 m avg / 3 m max, good for spinning; another more demanding with hard snags along the bank). Open 24h ("czynne całą dobę"); night fishing and tent camping permitted; drive-to-spot / access to fishing stands available. NO published cennik (prices) found on any public source — contact the fishery directly. Address discrepancy across sources: portalwedkarzy/globuya list "Knopin 26, 11-040"; znajdzlowisko gives coords 53.96654, 20.40565 (which fall in the Knopin/Dobre Miasto area and are consistent). Google rating 3.3 / 12 opinii taken from the portalwedkarzy.pl listing (could not verify directly on Google Maps — consent wall). Catch-keep vs catch-release policy (tryb) not documented publicly; "sum" (catfish) listed by znajdzlowisko only, other sources omit it. Fish-species list aggregated from znajdzlowisko (amur, sum, karaś, karp, lin, szczupak) and portalwedkarzy/globuya (karp, szczupak, lin, amur, karaś, okoń, płoć). Confidence medium: identity, location, phone, FB, species and rating are well-corroborated; exact coordinates, street number, tryb and pricing are uncertain/unavailable.