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.Know More
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 in Aquatic Pets
Although there is little proof, rare cases have indicated the possibility of cannibalism in goldfish. The National reported an incident in which goldfish ate other fish after an earthquake, leaving them of food for an extended period of time.Full Answer >
There are breeds of goldfish that are characterized by bulging eyes. However, for other breeds, if the eyes on a goldfish are protruding, it may be that the fish has an infection, is physically injured or has a metabolic disorder or that the eyes are responding to poor water conditions.Full Answer >
Odorous fish tanks occur for several reasons that include rotting food, undiscovered dead fish or snails, dead plants and excess waste. Overcrowding of fish tanks can also lead to foul odors. Improper tank cleaning is a common culprit as well.Full Answer >
According to Encyclopaedia Britannica, the goldfish, a member of the carp family that originated from ponds in East Asia, is an egg-laying fish. A fish that lays eggs cannot be pregnant, and therefore no special designation exists for a pregnant goldfish.Full Answer >