freshwater
Goldfish
Carassius auratus
Oblong, stout body shape with relatively large scales. This specimen exhibits 'Sarasa' or 'Comet' coloration with vibrant orange and white patches. It has a single dorsal fin, paired pectoral and pelvic fins, and a long, flowing caudal (tail) fin typical of ornamental pond varieties.
- Habitat
- Native to East Asia but globally distributed in slow-mov…
- Size & weight
- Typically 15-25 cm in ponds, but can exceed 40 cm and we…
- Diet
- Omnivorous opportunistic feeder. They eat aquatic plants…
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Physical characteristics
Oblong, stout body shape with relatively large scales. This specimen exhibits 'Sarasa' or 'Comet' coloration with vibrant orange and white patches. It has a single dorsal fin, paired pectoral and pelvic fins, and a long, flowing caudal (tail) fin typical of ornamental pond varieties.
Habitat & distribution
Native to East Asia but globally distributed in slow-moving or stagnant freshwater ponds, lakes, and rivers. They are highly adaptable to low-oxygen environments and varying temperatures.
Behavior
Social and often found in small groups. They are diurnal and spend much of their time foraging. They are known for their high intelligence among fish and can remember complex tasks.
Diet
Omnivorous opportunistic feeder. They eat aquatic plants, detritus, small crustaceans, insects, and zooplankton by sifting through substrate or grazing on surfaces.
Reproduction
Egg-scatterers that spawn in spring and summer. Females release sticky eggs onto aquatic vegetation which are then fertilized by males. They can produce thousands of eggs per season.
Ecological role
Invasive in many regions, they act as bottom-feeders that can increase water turbidity by uprooting plants and stirring up sediment. They compete with native species for food and resources.
Similar species
Crucian Carp (Carassius carassius) which is typically bronze/green and lacks the long fins; Common Carp (Cyprinus carpio) which is larger and possesses barbels at the corners of the mouth.
Identification tips
Look for the absence of barbels (whiskers) to distinguish from koi/carp, and note the bright orange/white coloration which is rare in native wild species.
Interesting facts
Goldfish were first domesticated from wild silver carp in ancient China over 1,000 years ago. They have a four-color vision system that allows them to see ultraviolet and infrared light.
Field notes
Small freshwater pond Devon England