I think those particular ones are in Sweden but this perch inhabits a huge chunk of EuroAsia.
European Perch
Perca fluviatilis Gr., perke = perch, a fish w/o ID
Actinopterygii>Perciformes>Percidae(Perches)>Percinae
FishBase: max 60 cm SL m./u.; common 25 cm TL; max 5 kg; max 22 y.
Fishing world records: max 58-68 cm; 4-7 kg; 27 y.
F/w; brackish; demeral; anadromous
pH 7.0-7.5; dH 8-12; depth 1-30 m, common 3-4 m
Temperate 10-22°C
Distribution: 74-38°N 91°W-168°E; Eurasia: t/o Europe to Aral Sea basin to Kolyma river, Siberia. Biol. Matures 11-23 cm, 1-2 (male)+2-4 (female) years. A very wide range of hab. incl. estuar. Opportun.- all avail. prey. Diurnal, main. dur. sunrise, sunset. Larv., small juv. - planktonic inverts. In 1st summer, many juv. move near shores to feed on benthic prey. Short spawn. migr. possib. Spawn Feb-Jul. Eggs in long white ribbons (<1 m) o/submer. obj. Its flesh is excellent, not so bony. Fisher.: highly commercial; aquaculture: com.; game. Least Concern.
IMO, they are tasty but bony.