Most goldfish breed in captivity, particularly in pond settings.Goldfish, like all cyprinids, are egg-layers. Their eggs are adhesive and attach to aquatic vegetation, typically dense plants such as Cabomba or Elodea or a spawning mop.
Goldfish, like other fish, can breathe outside of water, although not as well. Just be sure to keep them out of water for no more than 30 seconds at a time.Separate your breeders from your eggs. Unfortunately, goldfish in captivity have a tendency to eat nearly all their eggs.
Female goldfish spawn eggs into the water, then the eggs get fertilized externally with milt from multiple male goldfish. Fertilization is external. Female goldfish normally spawn 2000-4000 eggs at a time, although the highest number of eggs spawned was 380,000.

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Goldfish gets interested in spawning with gradually increasing temperature of the water, which ensures good spawning. Male grows tubercles on his gills and fins and starts to chase the female around the aquarium to encourage her to release eggs.
Goldfish spawning success depends on the breeders' conditioning and pre-spawning preparation.
Spawning mops are essential for goldfish breeding. These specially designed mops mimic aquatic plants and provide a surface for the pregnant female goldfish to lay their eggs. The pond spawning mop should have soft, fine fibers that allow the eggs to attach easily.
Keeping goldfish is much more difficult. Goldfish production entails a number of steps, including providing suitable habitat, locating viable partners, stimulating spawning, and safeguarding hatchlings and eggs.

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Is it ethical to breed goldfish in captivity? The ethics of breeding any animal, including goldfish, in captivity are a matter of personal opinion. Responsible breeders prioritize the health and well-being of their fish and avoid practices that could cause harm.
The goldfish (Carassius auratus auratus) is a freshwater fish in the family Cyprinidae. It was one of the earliest fish to be domesticated, and is one of the most commonly kept aquarium fish.The occurrence of other colors (apart from red and gold) was first recorded in 1276.