Can I keep Ruffe in a garden pond?

Yes, Ruffe can live in a garden pond provided it is adequately filtered and remains cool. However, because they are bottom-dwellers with excellent camouflage, you will rarely see them from above.

Are Ruffe related to Perch?

Yes, they belong to the same family (Percidae). You can tell them apart because Ruffe lack the bold vertical stripes of a Perch and have a single continuous dorsal fin rather than two separate ones.

Do Ruffe need to be kept in a group?

Yes, they are a shoaling species. Keeping them in groups of at least five helps them feel secure and encourages natural foraging behaviours.

What is the best food for a Ruffe in an aquarium?

They thrive on sinking meaty foods. Offer a mix of high-quality sinking carnivore pellets, frozen bloodworm, and small earthworms.

Why are Ruffe considered invasive in some parts of the world?

They are highly adaptable, can feed in complete darkness, and breed rapidly. In places like the North American Great Lakes, these traits allow them to outcompete native species for food and habitat.

FreshwaterTropicalIntermediate

Ruffe

Gymnocephalus cernua

The Ruffe is a small, highly adaptable European coldwater fish known for its remarkable sensory capabilities and distinctively spiky dorsal fin.

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Ideal Conditions

Temperature: 4 – 20 °C
pH range: 6.5 – 8
Hardness: 8 – 20 dGH
Adult size: 12 – 15 cm
Minimum for a small shoal: 250 litres+
Lifespan: 7 – 11 years
Diet: Carnivore
Water flow: low to moderate
Preferred setup: Soft sandy substrate is essential. Provide plenty of shaded areas with smooth rocks, bogwood, and coldwater plants.

About the Ruffe

Often overlooked in favour of more colourful or prominent species, the Eurasian Ruffe is a fascinating member of the Percidae family. It bears a passing resemblance to a small European Perch but is easily distinguished by its heavily mottled brown colouration and a continuous, joined dorsal fin. In the wild, they are highly successful benthic feeders, thriving in environments where other fish might struggle to find food.

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Where Ruffe comes from

Native range

Eurasia

Countries / regions

United Kingdom, France, Germany, Russia, Poland

Habitat

Slow-flowing rivers, lakes, canals, and reservoirs, typically over sand or mud.

Native across much of temperate Europe and northern Asia, but introduced and considered highly invasive in the North American Great Lakes.

Similar species

European Perch
Perca fluviatilis
Gudgeon
Gobio gobio

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Tench
Tinca tinca
Peaceful, complementary coldwater bottom dwellers that will not bother the Ruffe.
Great
Common Roach
Rutilus rutilus
Occupy the middle and upper water column, leaving the bottom clear for the Ruffe.
Great
Goldfish
Carassius auratus
Can outcompete the more deliberate, bottom-feeding Ruffe during feeding times.
Compatible with caution
Cherry Shrimp
Neocaridina davidi
Ruffe are highly effective micro-predators and will quickly consume small crustaceans.
Not recommended

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