Why do goldfish blow bubbles?


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.

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.

Q&A Related to "Why do goldfish blow bubbles?"
From what I've heard goldfish make bubblenests. Little groups of bubbles that stick together. A female goldfish will then lay eggs in that and the male will take care of the offspring
When a goldfish turns black, it can be a sign of healing. Similar to bruising on a human, this means they are getting better, and will turn back to gold, once they are better.
Fancies or standards? If you just got them and they're fancy goldfish, and if your tank isn't approx 70 gallons with double the filtration and been put through a complete nitrogen
The issue is that you have huge amounts of protein buildup, and as the fish go up to get air off the top of the bowl, they're creating bubbles in that dirt. First off, you have FAR
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