? Goldfish is a fish, which is evolved from wild crucian carp.
? Goldfish are said to be fish because they meet all the characteristics of fish.
1. Living in water: Goldfish live in water. Even if they can leave the water for a short time, they will die if they leave the water for a long time. This is a very clear feature of fish.
2. Breathe with gills: The main reason why goldfish can live in water is that they breathe with gills. Only when water flows through gill filaments can they complete the exchange of oxygen. Although some fish can breathe with other organs, most fish breathe with gills.
3. Fin swimming: Goldfish have no limbs, and their activities are accomplished by their fins. This is also an obvious feature of fish. Goldfish have dorsal, pelvic, anal and caudal fins, and different fins have different functions.
4. Oviparous reproduction: Goldfish reproduce in an oviparous manner, as do most fish. Although some fish are ovoviviparous, they are quite different from viviparous.
goldfish 1. Water temperature: Goldfish is a cold-water fish, the appropriate water temperature is 18-26 ℃, as long as the breeder keeps the water temperature in this range, there should be no violent fluctuations.
2. Water quality: Goldfish like neutral or weakly acidic water, and breeders can control the PH value between 7.0 and 8.5. Change it 1-2 times a week, and the amount of water changed each time is only a quarter. And
3, feed: that goldfish has miscellaneous feeding habit, and the breeder can feed the goldfish with artificial feed and live bait together, and regularly add some plant feed at ordinary time.
