How can I tell the difference between a Rudd and a Roach?

The most reliable way is to look at the mouth and fins. A Rudd has a distinctively upturned lower jaw designed for surface feeding, while a Roach has a downward-facing mouth. Additionally, the front edge of a Rudd's dorsal fin is set further back than its pelvic fins.

Will Rudd eat my pond plants?

Yes, adult Rudd are largely herbivorous and will actively graze on soft aquatic vegetation. They are particularly fond of duckweed, which makes them excellent for controlling it, but they may also nibble on the young shoots of submerged oxygenators.

Can Rudd survive freezing winter temperatures?

Yes, as long as the pond is deep enough (at least 60-90 cm) so that it does not freeze completely solid. During winter, Rudd will retreat to the deeper, slightly warmer water at the bottom and enter a state of torpor until spring.

Do I need to keep Rudd in a group?

Absolutely. Rudd are schooling fish that rely on numbers for security and social interaction. Keeping them in groups of at least five (preferably more) is essential for their well-being.

Are Rudd suitable for a standard garden aquarium?

Generally, no. Due to their adult size (up to 35 cm) and need for large, active shoals, they require significantly more space than a standard aquarium can provide. They are best suited to large outdoor ponds.

FreshwaterPondBeginner

Rudd

Scardinius erythrophthalmus

A vibrant, surface-dwelling pond fish noted for its bright red fins, golden-green flanks, and active shoaling behaviour.

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Ideal Conditions

Temperature: 4 – 22 °C
pH range: 6.5 – 8
Hardness: 5 – 20 dGH
Adult size: 25 – 35 cm
Large Pond: 2,000 litres+
Lifespan: 10 – 15 years
Diet: Omnivore, leaning heavily towards herbivorous as adults; requires significant plant matter and surface insects.
Water flow: Low to moderate
Preferred setup: Spacious pond with areas of dense planting and wide open surface space for cruising.

About the Rudd

Native to Europe and parts of Asia, the Rudd (Scardinius erythrophthalmus) is a classic addition to spacious garden ponds. Recognisable by their striking crimson fins and distinctly upturned mouths, they bring dynamic movement to the upper layers of the water. Unlike some bottom-feeding cyprinids, Rudd are adapted to hunt for insects near the surface, making them highly visible during the warmer months.

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Is it right for your tank?

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Where Rudd comes from

Native range

Europe, Middle East, Central Asia

Countries / regions

United Kingdom, France, Germany, Russia, Ireland

Habitat

Still or slow-flowing waters with abundant aquatic vegetation, such as lakes, ponds, and quiet river backwaters.

Widely introduced outside its native range, including parts of North America and New Zealand, where it is often considered an invasive species.

Similar species

Roach
Rutilus rutilus
Golden Orfe
Leuciscus idus
Common Bream
Abramis brama

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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Koi
Cyprinus rubrofuscus
Both are peaceful, large pond fish that appreciate similar water parameters and spacious environments.
Great
Goldfish
Carassius auratus
Excellent peaceful companions that share the same dietary and temperature requirements in a pond.
Great
Tench
Tinca tinca
Tench inhabit the bottom of the pond while Rudd occupy the surface, ensuring no competition for swimming space.
Great
Golden Orfe
Leuciscus idus
Both are highly active surface-feeders; they can coexist beautifully but ensure enough food is provided to prevent competition.
Compatible with caution
Sterlet
Acipenser ruthenus
Rudd feed quickly at the surface and may consume all the food before the slow, bottom-feeding sturgeons can eat.
Compatible with caution
Pike
Esox lucius
Pike are highly predatory and will view Rudd as a primary food source.
Not recommended

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