freshwater
Crucian Carp (Golden Variety)
Carassius carassius
Deep, high-backed body with a distinctive lateral curve. This specimen displays a bright orange-gold coloration. It has large, well-defined scales and a rounded caudal (tail) fin with a slightly convex or straight edge on the dorsal fin. The mouth is small and lacks barbels.
- Habitat
- Found in still or slow-moving freshwater such as ponds,…
- Size & weight
- Typically 15-30 cm in length, weighing 0.5-1.5 kg, thoug…
- Diet
- Omnivorous bottom-feeder; its diet consists of aquatic i…
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Physical characteristics
Deep, high-backed body with a distinctive lateral curve. This specimen displays a bright orange-gold coloration. It has large, well-defined scales and a rounded caudal (tail) fin with a slightly convex or straight edge on the dorsal fin. The mouth is small and lacks barbels.
Habitat & distribution
Found in still or slow-moving freshwater such as ponds, lakes, and marshes. They are highly resilient and can survive in very low-oxygen environments and freeze-prone waters across Europe and Asia.
Behavior
Generally a shy and secretive species. They are often found in thick vegetation and are more active during dawn and dusk. They can be solitary or found in small groups.
Diet
Omnivorous bottom-feeder; its diet consists of aquatic invertebrates, insect larvae, small crustaceans, and plant material sifted from the sediment.
Reproduction
Spawns between May and July when water temperatures rise. Females lay sticky eggs on aquatic vegetation, which are then fertilized by males. They are known to hybridize with goldfish and common carp.
Ecological role
Functions as a low-level consumer and a prey species for larger predatory fish and birds. They are known for their extreme physiological adaptations to survive anoxia (lack of oxygen).
Similar species
Goldfish (Carassius auratus) which usually have a more concave dorsal fin and different scale counts; Common Carp (Cyprinus carpio) which possess barbels at the corners of the mouth.
Identification tips
Look for the high-backed 'hump' shape, the lack of barbels around the mouth, and the convex (rounded outward) edge of the dorsal fin.
Interesting facts
Crucian carp are the only fish known to be able to survive for months without oxygen by metabolizing glycogen into ethanol, which they then excrete through their gills.
Field notes
Small freshwater pond in Devon England