Gibel carp

Water parameters

Minimum tank: 500 L per individual at harvest size.

Feed and growth

Feed protein

28% target

Daily feed (warm)

1.60% of body weight

Daily feed (cool)

0.50% of body weight

Max density

50 g per litre

A 2000 g adult eats about 32.0 g of feed per day at optimum. 10 fish at adult size: ~320 g daily.

Legality

Rules vary by jurisdiction and change over time. Verify with your local fisheries or wildlife authority before stocking.

Unlisted jurisdictions default to "check local regulations".

Origin and habitat

Despite the file name, this is the gibel or Prussian carp, Carassius gibelio, a distinct species rather than a literal cross between crucian carp and goldfish. It belongs to the genus Carassius alongside the crucian carp and the goldfish, is native to Eurasia and East Asia, and is closely tied to the goldfish, which was domesticated from this Carassius complex. Its standout trait is reproduction: gibel carp often reproduce by gynogenesis, in which all-female clonal populations use the sperm of other cyprinids, including common carp and goldfish, only to trigger egg development without taking in the male's genes. This clonal ability, alongside fast growth, broad tolerance, and disease resistance, makes it both a heavily farmed fish and an aggressive invader. It has become a major aquaculture species in China, where selected gynogenetic strains such as 'CAS III' are produced on a huge scale, on the order of three million tonnes a year, and it has spread as an invasive across much of Europe, outcompeting the native crucian carp. Fully grown fish reach about 45 cm and up to roughly 3 kg, with a deep, silvery body. It is eaten in China and parts of Eastern Europe but is little known elsewhere. Gibel carp is told apart from the true crucian carp by larger scales, fewer lateral-line scales, a more deeply forked tail, and a silver rather than golden cast.

Climate and outdoor ponds

Climate

temperate (handles seasonal swings)

USDA zones

3–11 (winter low around -40°C or warmer)

Heating needed

no

Cooling needed

no

Care notes

A niche aquaculture fish that matters mainly in Chinese and Eastern European markets. At heart it is a cold-water carp, tolerant of near-freezing water, very low oxygen, high ammonia, and a wide pH band, and it keeps growing at temperatures too low for tilapia. Its practical range is roughly 2–30°C, with growth even at 8–10°C; sustained heat past about 30 C can exceed its comfort. Growth reaches 300–800 g in twelve to eighteen months on a carp pellet of 28 to 32 percent protein, with feed conversion around 1.8 to 2.5, and it takes crowding well, so stocking can run moderate to high. For aquaponics it is most useful in cold-climate regions where other food fish are unavailable or too sensitive. The limits are market and legality: in the West the fish is unknown and unmarketable, and because gibel carp is a strong invader, it is prohibited in parts of the US and Australia, so it should not be raised anywhere it could escape into local waters. Fingerlings come from specialized hatcheries in China and Eastern Europe.

Further reading

• Aquaponics water chemistry: balancing pH for fish and plants
• Fish for aquaponics: tilapia vs everything else