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Goldfish is more suitable for group farming and intensive farming. However, the density of livestock should not be too high, the ideal ratio of water to fish should reach 1000: 1, and the length of goldfish and fish tanks should reach 1: 10 or more, so as to ensure good water quality and sufficient dissolved oxygen. Otherwise, the breeding density is too high, the water quality will deteriorate rapidly, the dissolved oxygen in the water is insufficient, and goldfish will easily get sick and die of lack of oxygen.

Goldfish is a temperature-changing animal and has strong adaptability to water temperature. Its body temperature changes with the water temperature, and it can survive at the water temperature of 0-39 degrees Celsius. But goldfish can't adapt to the drastic change of water temperature, and the sharp rise or fall of temperature over 5 degrees Celsius may endanger the life of goldfish. The optimum temperature for goldfish growth is 20-28 degrees Celsius. At this water temperature, goldfish grows most vigorously, with the largest food intake, excretion and oxygen consumption, and is the most lively goldfish.