![]() When you are using an aeration system, the surface movement lets oxygen inside, which then gets used up by the goldfish and is quickly replenished. Goldfish do best in a rectangular aquarium because of the amount of surface area the tank design has to offer. ![]() This makes it important to have a proportionate aquarium. Oxygen enters the water through the surface. Goldfish do not have lungs as mammals do, and their mouth and gills are the primary external body movements to take in oxygen. The gill flaps will open and close to let oxygenated water in and this helps your goldfish to breathe effectively in an aquatic environment. They draw in the oxygen through the gills and expel carbon dioxide. ![]() Goldfish breathe through their gills that move in synchronization to their mouth. Tropical fish are adapted to less oxygen and that is why tropical fish can handle warm water with minimal oxygen issues. If the temperature seems to frequently warm to over 25☌, your goldfish will struggle to retain oxygen. Goldfish are used to naturally taking in more oxygen because they originate from cold water. Since goldfish are temperate water fish, they should be in a tank with a temperature ranging from 17☌ to 24☌. Image Credit: gunungkawi, Shutterstock How Temperature Affects Oxygen LevelsĬold water holds more oxygen than warm water does. Stocking the goldfish tank correctly is important to ensure each goldfish can breathe properly and take in oxygen with little effort. Overcrowding can also cause the goldfish to compete for oxygen. The bigger the tank, the more dissolved oxygen is available in the water for the goldfish to take in. This is another reason goldfish should have large tanks. Goldfish are large and active fish that will quickly take up oxygen in the water. They should also not be placed in bowls or small spaces where the surface of the water is significantly smaller than the rest of the aquaria. For this reason, you need to place various aeration systems throughout the tank. To put it simply, goldfish require a lot of oxygen.
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