Usually once the chase starts the breeding starts so both actions happen at the same time. The chase is a part of the breeding cycle.
Spring time is the breeding season for goldfish. During this time female goldfish will put on weight, and male goldfish will develop breeding tubercles (white dots on the head and gills). Goldfish may chase each other around the habitat in an effort to find a mate. When a male and female goldfish choose a mate the female will release her eggs onto the breeding ground (such as an aquatic plant, or breeding mop). The male goldfish will then release a cloud of Milt (sperm). The milt thus fertilizes the eggs, and goldfish fry begin to form within the eggs. The goldfish eggs will continue to develop for several days until they eventually hatch into fry. The fry will then grow into fully developed goldfish overtime. These goldfish will eventually reproduce, and thus continue the life cycle.
The other goldfish might be bullying - please remove the black one before it stresses too much and dies.
No. It is a territorial thing.
The white dots mean the males are ready to spawn. The spawning procedure of goldfish is to chase one another.
Any kind of goldfish will mix OK with any other kind of goldfish. Goldfish are all one species with many 'sports' that have been developed by selective breeding. The only No! No! is if you have some well bred fish and don't want them to cross breed at breeding time. Then you will need to keep type with type, otherwise, since they are the same species, they will cross breed and your resultant fry will be almost worthless crossbred goldfish.
Yes you can mix them (they are all the same species) but in spring/summer time they will do what you are observing and that is cross breeding. The chasing, and nibbling is all part of goldfish spawning behaviour.
They will spawn when conditions are right. There is nothing you can do to stop them other than making them all too sick to spawn.
Swim, hide, eat, poop, and chase each other is about all they do. Chasing other fish in a human perspective seems like the most entertaining.
Probably just for fun. Lots of creatures play chasing games why should goldfish be any different?
Goldfish (Carassius auratus auratus) need enough water and the right temperature to breed, especially in pond settings. Breeding usually occurs after a significant temperature change such as occurs in the spring. If you have a gravid (carrying eggs) goldfish, you will need the males to make egg laying possible. The males will chase, bump and nudge the female, and that will stimulate egg release. The eggs will attach to aquatic vegetation and hatch within 48-72 hours. It would be a good idea to remove all other fish at that time. Goldfish, and others, are known to eat the fry.
when it`s face is round it is female or the female will have more of a V in its tail fin as a male will have less of a V Sexing Goldfish outside of the breeding season is extremely difficult. In the breeding season males develop small white pimples (breeding tubercles) on their gill covers and along the edge of their front fins (pectoral fins). Females are generally more rounded and deeper in body shape as they fill with roe (eggs) and have a larger vent before the anal fin.
Probably, but usually the comet goldfish will get all the food and/or the other goldfish will become miserable. This has happened to me before and I do not recommend putting them in the same tanks. Try putting the fancy and comet godlfish seperate!