European Perch

Perca fluviatilis

FreshwaterFish

Care at a glance

Temperature: 50–72°F (10–22°C)
pH: 6.5–8.0
Adult size: 19.7 in (50 cm)
Minimum tank: 119 gal (450 L)
Temperament: Aggressive
Social behavior: Solitary
Swim level: Middle
Difficulty: Medium
Breeding: Hard
Rarity: Very rare
Origin: Europe
Family: Percidae

Overview

This is a predator, not a community fish. It eats smaller fish, crustaceans, insects, and larvae, and will swallow any tankmate it can fit in its mouth. Juveniles hunt in loose packs, but adults turn solitary and territorial. Keep it cool, give it strong filtration and open swimming space with some cover, and feed meaty foods that match its natural prey. It is best left to large coldwater or pond setups.

In the wild

European perch live across Europe and northern Asia in lakes, rivers, ponds, and reservoirs. They like clear, cool water with some vegetation and a rocky or sandy bottom. This is a large coldwater fish, comfortable from around 10 to 22 C, so it needs a big, well-filtered, unheated setup, not a tropical community tank. Plan for at least 450 liters and realistically far more for an adult.

Good to know

European perch belong to the family Percidae and carry dark vertical bars and a spiny first dorsal fin. They can reach about 50 cm and over 4 kg, though most stay smaller. The IUCN lists them as Least Concern with stable populations. They are heavy spawners, with females laying thousands of eggs in long gelatinous ribbons draped over plants and branches in spring.

Did you know

Perch hunt cooperatively as juveniles, with whole shoals herding smaller fish, which is unusual behavior for a freshwater predator. As they grow, that teamwork fades and big perch become loners that will happily eat the smaller perch they once schooled with.