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The term 'veiltail' is commonly and erroneously applied to any goldfish displaying a long caudal, but true veiltails must have all the characteristics described above. Veiltails are available in many colors and may have either metallic or nacreous scales. They can grow from 8 to 12 inches (20 to 30 cm).
Wild Betta fish are hardy and eat almost any animal small enough to consume. This includes worms, larvae of mosquitoes or other insects, and smaller fish. Their natural environment is often resource-limited, so many Betta species are generalist feeders.
Within a week or so, the fry begins to assume its final shape, although a year may pass before they develop a mature goldfish colour; until then they are a metallic brown like their wild ancestors. In their first weeks of life, the fry grow quickly—an adaptation born of the high risk of getting devoured by the adult goldfish.
Paternal mouthbrooders include the arowana, various mouthbrooding bettas and gouramies such as Betta pugnax, and sea catfish such as Ariopsis felis. Among cichlids , paternal mouthbrooding is relatively rare, but is found among some of the tilapiines , most notably the black-chin tilapia Sarotherodon melanotheron .
A betta fish's lifespan can be impacted by the care it receives, WebMD reports. Bettas may live longer if their tank is clean, the environment is calm and their diet is healthy.
Some highly selectively bred goldfish can no longer breed naturally due to their altered shape. The artificial breeding method called "hand stripping" can assist in breeding, but can harm the fish if not done correctly. [28] In captivity, adults may also eat young that they encounter.
A recent study in the Journal of Great Lakes Research shed light on the growing problem of goldfish proliferating outside of the proverbial fish bowl.
Female ryukin goldfish with swim bladder disease The gas bladder of a fish Swim bladder disease , also called swim bladder disorder or flipover , is a common ailment in aquarium fish . The swim bladder is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy , and thus to stay at the current water depth ...