The bubble eye fish is a distinctive freshwater ornamental fish, a type of fancy goldfish developed through selective breeding. Its most notable characteristic is the two large, fluid-filled sacs located beneath its eyes. These sacs make it a popular choice among aquarium enthusiasts.
Understanding Bubble Eye Fish
Bubble eye goldfish are characterized by two large, transparent sacs filled with fluid, positioned directly beneath each eye. These sacs, which are not the actual eyes, can grow quite large, sometimes exceeding the size of the fish’s head.
The fish possesses a rounded, egg-shaped body and lacks a dorsal fin, a common trait among many fancy goldfish varieties. Their caudal fin is usually split and flowing. They exhibit a wide range of colors, including red, orange, yellow, blue, chocolate, calico, and black. Known for their peaceful and calm disposition, bubble eye goldfish are slow swimmers, largely due to the obstruction caused by their unique eye sacs.
Caring for Bubble Eye Fish
Providing an appropriate environment for bubble eye goldfish requires careful consideration due to their delicate eye sacs and slow swimming ability. A minimum tank size of 10 gallons is recommended for a single bubble eye, with 20 gallons preferable, and an additional 10 gallons for each additional fish. These fish produce significant waste, necessitating robust filtration and regular water changes to maintain water quality. Ideal water temperature ranges from 60-80°F (15-27°C), with a neutral pH between 6.0 and 9.0, and water hardness between 6 and 19 dGH.
For substrate, smooth, soft options like fine sand or a bare bottom tank are advisable to prevent injury to their eye sacs. Sharp or abrasive decorations should be avoided.
Bubble eye goldfish are omnivores and benefit from a balanced diet. High-quality sinking pellets are recommended over floating flakes, as floating food can cause them to ingest air, potentially leading to buoyancy issues. Their diet should also include protein-rich foods such as daphnia, bloodworms, or brine shrimp, and can be supplemented with occasional plant matter like algae. Due to their slower swimming, they may need more time to eat, so feeding them multiple times a day in smaller quantities can be beneficial. Compatible tank mates include other slow-moving goldfish varieties like black moors or other bubble eyes, as more active fish could outcompete them or injure their sacs.
Health and Handling of Bubble Eye Fish
The sacs beneath the eyes of bubble eye goldfish are vulnerable to injury. To prevent ruptures, avoid sharp tank decorations, rough substrates, and aggressive tank mates. Use caution when moving a bubble eye fish; a soft, fine-meshed net or plastic container can help prevent damage.
If a sac ruptures, maintain clean water conditions to prevent infection. Small tears may heal on their own with good water quality and a balanced diet. For larger tears or signs of infection, consult an aquatic veterinarian.
Bubble eye goldfish are susceptible to common goldfish diseases such as Ich, dropsy, and fin rot. Maintaining stable water parameters, regular tank maintenance, and a nutritious diet are preventative measures against these illnesses. Observing the fish for any unusual behavior or physical changes can help in early detection and treatment of health issues.