What you're looking at
The European perch (Perca fluviatilis) is one of the most recognisable freshwater fish in the UK, bold dark stripes, fiery red lower fins, and a spiked first dorsal. Found in pretty much every stillwater and most rivers nationwide.
Key features
- Body: Deep, slab-sided, slightly humped behind the head on larger fish.
- Markings: Five to nine dark vertical bars on a green-bronze back, fading to gold-cream on the flanks. Belly white.
- Dorsal fins: Two distinct dorsals, a spiny front fin (often held flat, raised when stressed) and a soft rear fin with a dark spot at the trailing edge.
- Fins: Pelvic and anal fins are bright orange-red; the trailing edge of the tail is also reddish.
- Operculum: Sharp gill cover spine, handle with care.
- Size: Most fish are 0.2–0.7 kg. 1 kg ("pounder") is a benchmark; 2 kg+ is specimen class; UK record over 2.8 kg.
Confusion species
- Ruffe: Smaller, browner, dorsal fins joined (not separate), no vertical bars, just blotchy mottling.
- Small zander: Long body, no vertical bars, fang-like front teeth, big eye.
Where to find them
Perch shoal up under cover, pontoons, drop-offs, weed lines, marina pilings, sunken trees. Big perch are loners; they hold near features and ambush smaller fish. Feed best in low light and through the cool months. Live-and-let-live the spines: lay them flat as you grip behind the gills.