Black Goldfish (Carassius auratus)

Black Goldfish Carassius auratus
Name	Black Goldfish
Name Lat.	Carassius auratus
Family	Carps
Family lat.	Cyprinidae
Order	Carps
Order lat.	Cypriniformes
Origin	Asia (breeding variety)
Habitat	Ponds
Diet	Omnivore
pH	6.0-9.0
Behavior	Peaceful
Keeping	Group
Care Level	Easy
Reproduction	Egg scatterer
Breeding	Moderately difficult
Life Span	10-20 years
Protection	No
Metric Units
Size	20-30 cm
Temperature	4-30 °C
Hardness	10-30 °dH
Aquarium	Pond
US Units
Size	8"-12"
Temperature	39-86 °F
Hardness	178-534 ppm
Aquarium	Pond

Distribution and habitat

Already in the 11th century in China from red-gold color morphs of the silver crucian carp, according to other sources from the gable, the goldfish was bred out. Via Japan, the goldfish, bred in many different varieties, spread worldwide and can today be described as domesticated

Maintenance

The pond should be furnished with pond, floating and oxygenating underwater plants (milfoil, waterweed, hornwort, etc.), large river pebbles, and a substrate of sand and round-grained gravel and provide free swimming space

When maintaining in a cold water aquarium, care should be taken to provide adequate swimming space in addition to robust perimeter planting and numerous hiding places (roots, rocks). A substrate of fine, round-grained gravel or aquarium sand and slightly shaded light (floating plants) is ideal.

No ammonia, ammonium and nitrite should be detectable in the water, and the nitrate value should not exceed 50 mg/l. To ensure the water quality and oxygen content should not be missing a filter adapted to the water volume.

Diet

They are easy to feed. For a balanced diet, feed once a day with a high-quality dry food for goldfish (flakes, sticks, granules, pellets) with low protein content (below 30%). In addition, they need vegetable food, such as aquatic plants (Egeria densa, Cabomba caroliniana, Rizzia flutians, etc.) or scalded leaves (spinach, dandelion) or dry food with high vegetable content (spirulina). Occasionally, daphnia, tubifex or mosquito larvae (live or frozen) should also be offered.

It is recommended to feed small portions several times a day, which are eaten within a few minutes. A regular and varied diet promotes health and prevents deficiency symptoms.

Behaviour and compatibility

They are calm, peaceful and sociable fish that do not exhibit any aggressive or incompatible behaviors. At least 5 goldfish should be kept together.

In principle, only mutually compatible fish species with similar requirements for water quality and water temperature may be socialized.

Reproduction and breeding

The sexes are difficult to distinguish, males are slightly more slender and have a concave (indented) anal opening.

After a pronounced courtship behavior, up to 1,000 and often more eggs are laid. The larvae hatch after five days.

Important

If goldfish are overwintered in the pond, ensure sufficient depth and oxygen supply (filter, oxygen dispenser, ice free holder).

At temperatures below 10 °C, the metabolism of the goldfish slows down and no more food is accepted; feeding must be stopped accordingly. If the temperature drops further, they burrow into the mud and go into hibernation. In spring, with rising temperatures, feeding can slowly be resumed. Feeding may also be necessary during prolonged warm periods in winter.

The well-being of the fish should be monitored regularly. A regular partial water change, according to the pond size is recommended, even if the pollutant load has not yet reached the upper limit. Sudden changes in water quality should be avoided. Newly introduced fish must be accustomed slowly to the water in the pond or aquarium

Further literature can be found in your pet store.

References

Text: petdata; Image: Franz Lowak

Source: BMELV (1998): Tierschutzgutachten - Haltung von Zierfischen (Süßwasser); RIEHL & BAENSCH (2006): Aquarien Atlas Bd. 1, Mergus Verlag; ENGELMANN (2005): Zootierhaltung - Tiere in menschlicher Obhut: Fische; Harri Deutsch Verlag

• Gemäß § 21 Abs. 5 Tierschutzgesetz idgF