Goldfish fish only appear to be blowing bubbles as it opens its mouth to draw in water for oxygen absorption. Sometimes as the fish opens its mouth, air escapes and creates a pocket, which forms into a bubble and makes it appear as if the fish is blowing bubbles.Know More
Goldfish, like all other fish, breathe oxygen. However, unlike mammals that use lungs to breathe in air for oxygen absorption, goldfish use an organ known as gills. According to the Northeast Fisheries Science Center, fish do not breathe in water, but draw in water through the mouth to allow it to pass over the gills. As the water passes over the fine gill membranes, the gills absorb the oxygen from the water. The oxygen dissolves into the blood vessels of the gills and is passed into the bloodstream of the goldfish. Once the blood is oxygenated, the blood is pumped back through the fish’s body.
A gas exchange also occurs at the gills. As the gills absorb the oxygen, it also releases carbon dioxide into the water. Then the water, which is now filled with carbon dioxide, is released and passed out of the gills through the operculum. Other aquatic invertebrates that have gills include crabs and mollusks.Learn More
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 >
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 >
Betta fish primarily make bubbles to construct nests for their eggs and fry. Only male betta fish, which are also known as Siamese fighting fish, create such nests. Male betta fish are the only ones that provide parental care.Full Answer >
A goldfish indicates stress by gasping at the surface of the tank, refusing to eat, swimming in strange patterns or developing white spots on its body known as "ich." A goldfish may also develop fungus or a bacterial infection, manifested as white cottony growths or red spots, respectively. Sluggish and abnormal behavior indicate that a fish is being subjected to consistent low-intensity stress.Full Answer >