A fish species from the carp family. Many varieties were produced in different colors and body structures by the crossover method. Most of the goldfish species such as comet, shubunkin, Syrian japanese can live in cold water. If they are fed as a single breed in the aquariums they are in, there is no need for a heater. But for fancy goldfish (like ratio, ranchu, rykuin) a heater is needed, the heater is an important equipment to keep the temperature constant, not to heat the water. Wild species can live between 4-30 degrees, while fancy species can live between 18-25 degrees.
An aquarium where Goldfish will be kept must have a minimum water volume of 20 liters per Goldfish. For goldfish, pond type baits are risky. It can cause air bladder problem in fish. Granular and flake type foods should generally be preferred for goldfish. The diet of goldfish should be plant based. When the necessary conditions are met, goldfish can live up to 25 years old. They reach reproductive maturity at a minimum of 1-1.5 years of age. The best method to know their gender is to watch their egg laying. The female fish is chased by the male, while the male hits the female's stomach, causing her to lay the eggs.
It is possible to breed in an aquarium if the necessary conditions and breeders are provided. They reproduce by laying eggs. If the edge of the gill covers is white, it is a male. The abdomen of the female, ready to lay eggs, swells, spots appear on the gill covers of the male. After the female lays eggs, the male ejaculates his sperm. After spawning, the mates should be taken to another aquarium immediately.
However, goldfish make the water white during breeding. This is a negative aspect for the observation of reproduction. Laying marbles at the bottom of the tank is a method used to prevent couples from eating their own eggs after spawning. By adding appropriate amount of methylene blue to the tank with the eggs, the ventilation should be operated continuously and the eggs should not be allowed to mushroom.
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