Bubble-Eye Goldfish – Carassius auratus
Species name: Carassius auratus
Common names: Bubble-Eye Goldfish, Water-Bubble Eye Goldfish
Class: Actinopterygii (ray-finned fishes)
Maximum length: 6 in (15 cm).
Minimum tank size: 50 gallon for an adult specimen
Hardiness: Easy to medium
Aggressiveness: May nip at fins. Will eat fish that can fit in it’s mouth.
Distribution: Central Asia, China, Japan
Diet: Omnivore. In the wild, they feed on a wide range of food including plants, small crustaceans, insects, and detritus.
In captivity, they will accept most aquarium food including pellets, flakes, and live prey such as worms.
The Bubble-Eye Goldfish (Carassius auratus) is also known as the Water-Bubble Eye Goldfish. It is a member of the carp family and originates from Asia and China. These amazing fish inhabit slow moving and stagnant waters, such as lakes, ponds, rivers and ditches, where they feed on insects, small crustaceans, plants and detritus (decaying animal and plant matter). The Bubble-Eye was actually developed in China, and its unusual shape is the result of many years of selective breeding.
The Bubble-Eye can easily be recognised by its upturned eyes and the fluid sacs beneath them. It has an egg-shaped body and a double tail, but no dorsal fin. The fluid-filled sacs can, however, burst easily if they get caught on sharp objects within the tank. A damaged sac will eventually grow back again, but will most likely be misshapen or scarred. The Bubble-Eye can grow to around 15cm/6inches in length and can be found in a variety of different colours, including gold, red, chocolate, red/white and even black.
It is relatively easy to sex the Bubble-Eye, as during the breeding season the males develop tiny raised white spots (known as tubercles) on their heads, gill covers and pectoral fins. The females will become fatter when they are carrying eggs.
In the correct conditions, fancy goldfish can grow quite large and are therefore not really suitable for small aquariums. They require a minimum tank size of approximately 3ft/91.4cms and a minimum tank volume of 100 litres. The water temperature should range from 20 – 24°C with a pH range of 6.5 – 8.5 and a water hardness of 0-0 Dgh. As Bubble-Eyes are slow swimmers and have poor eyesight, they are best kept on their own and are not really suitable for beginners.
Like all goldfish, Bubble-Eyes are omnivores and will readily eat flake foods, pellets, green foods, and most live foods such as bloodworm and daphnia.
Providing Bubble-Eyes are well cared for they will generally begin breeding from around the age of 2 years. The eggs tend to be scattered around the tank and the fry will hatch after a few days. It is, however, best to remove the fry and place them in a separate tank to prevent the adult fish from eating them. As soon as the fry appear, they will need to be fed with very small pieces of food. Young Bubble-Eyes are bronze in colour to begin with and do not develop their true colours until they are about a year old.
The Bubble-Eye unfortunately has a tendency to suffer from swim bladder problems due to its body shape. Swim bladder problems and constipation can also be caused by excessive feeding of processed fish foods. If fish do develop a swim bladder problem, they should be fasted for 24 hours and then fed with frozen green peas.
A well cared for Bubble-Eye can live for up to ten years or more in captivity.
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