goldfish is the fish, they belong to the vertebrate animal, is the ornamental fish which the crucian carp improves becomes. When they reproduce, they lay eggs first, and then the male ejaculates. Fish eggs are fertilized in vitro and hatched in vitro. Mammals are viviparous and fertilized in vivo, and embryos need to mature in the mother's body before they can be produced. What is produced is a fetus, not a fish egg. Another feature of mammals is that they breathe with their lungs and produce milk. Goldfish do not produce milk, and they breathe with their gills. Nowadays, most ornamental fish are oviparous, and some are ovoviviparous, but none are viviparous. The more common aquatic mammals are whales and dolphins.
goldfish 1. Water temperature: Goldfish have strong adaptability to water temperature, and breeders only need to keep the water temperature between 18 and 26 degrees Celsius. However, they are more sensitive to temperature differences, and breeders need to pay attention to the temperature difference not exceeding 3 degrees Celsius at ordinary times.
2. Water quality: Goldfish like weak alkaline water quality, and breeders need to control the PH value between 7.5 and 8.0. The metabolism of goldfish is relatively high, so it is better for the breeder to change water every 2-3 days, and the amount of water changed each time should be controlled at one third of the total amount of water.
3. Feeding: Goldfish have mixed feeding habits and can eat more kinds of food. Breeders can usually feed some synthetic feed to ensure balanced nutrition. It can also feed some shrimp, red worms, Tenebrio molitor and so on to ensure adequate nutrition.
