2. Goldfish is a kind of temperature-changing animal. Its body temperature can change with the water temperature, but it can't change indefinitely with the water temperature.
Too cold or too hot will affect the growth and development of goldfish. The optimum living environment temperature of goldfish is 22~24℃, which is also called the optimum growth temperature. At the optimum temperature, goldfish seek food extremely vigorously, with the fastest growth rate, increased excrement and oxygen consumption, and the highest physiological requirements. In the actual breeding, during this period, the method of mixing water or changing water once every three days is adopted to keep the goldfish in the best feeding state with clear water and sufficient oxygen. Goldfish with water temperature of 15~ 18℃ have moderate food intake, normal activities and the longest shelf life of water quality, which is a relatively easy stage for goldfish to manage.
3. Goldfish has a gentle personality, and there will be no big goldfish chasing small goldfish. In addition to the breeding season, goldfish of various shapes and colors can be mixed together.