In winter, goldfish may lie on the bottom of the tank because the temperature difference is too large. In winter, the temperature difference between day and night is large. Breeders must ensure that the water temperature is constant and the temperature change is controlled within 2 degrees. It may also be due to illness, such as enteritis, colds, bacterial infections, etc. It may also be caused by poor water quality. If there are more harmful bacteria in the water, goldfish will also become uncomfortable.

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Although goldfish is an omnivorous fish that has been completely domesticated by humans, whether the feed is properly selected and whether the feeding is correct can directly affect the health of the goldfish. Growth and development, color depth and vividness, appearance of features, fullness or lack thereof, as well as number of eggs laid, hatchability and disease resistance of the goldfish.