Goldfish may leap out of their tanks if the water is too warm, or if it is not at a proper acidic level. Irritants building up in a tank that has not been cleaned recently, external parasites, and lack of oxygen in the water from waste gas build-up are also common causes for this mystifying behavior.Continue Reading
Goldfish prefer an environment between 65 and 75 F. When temperatures rise above 75, they are triggered to spawn. A fish eager to breed will become very active, swimming rapidly and even leaping from its bowl.
Acidic water and alkaline water both irritate the sensitive skin of goldfish, causing them to swim erratically and leap to escape the pain. Proper pH in a goldfish bowl should be between 5 and 8.5. Common tap water is pH 7, but waste from the fish can make the water acidic. This is why switching to a different brand of filter can cause goldfish to suddenly exhibit leaping behaviors: a filter that doesn't work the way a fish is used to, or which is improperly installed, can make the water irritate the fish.
Fish that are infected with skin parasites will attempt to rub them off on foliage, rocks, the sides of the tank and anything else they can get in contact with against their skin. Sometimes this vigorous rubbing results in accidental leaps.
Deoxygenated water will result in leaping and gasping. Goldfish of course cannot breathe air, but water close to the surface contains more oxygen than deeper water.Learn more about Aquatic Pets
Goldfish often turn black due to genetics, according to FishChannel.com. A goldfish can change color several times over the course of its life. When a goldfish begins turning black, it is often not a serious issue and is most likely due to natural causes.Full Answer >
Goldfish live in temperate bodies of freshwater and have a preference for murky conditions. This breed is hardy and can endure temperatures near freezing, provided their habitat has enough oxygen and remains unfrozen. In the winter, outdoor goldfish exhibit dramatically decreased activity and remain in this state until spring.Full Answer >
Goldfish eat smaller fish as long as they fit in the goldfish's mouth. Goldfish do not have a picky diet. They eat a lot and go for whatever they can find that will fit in their mouth. This includes everything from fish flakes to other small fish.Full Answer >
Goldfish swim upside down when they have swim bladder disease. Goldfish and other species of fish may also swim sideways or do not have the ability to swim to the bottom of the tank if they have this disease.Full Answer >