How to hand breed big Goldfish complete process and there timelapse
**Temperature for breeding goldfish
first lower the temperature of your tank to between 10°C/50°F and 12°C/54°F. Then, when you want to induce breeding, raise the temperature of the water by 2°C/3°F per day, until it is between 20°C/68°F and 23°C/74°F.
** Goldfish breeding behaviour
Goldfish are ready to breed when males display white “pimples" on their gills and fins (like this) and females look fatter than usual.
You may notice the male chasing the female around the tank and poking her in the abdomen. This is spawning behaviour, though it can be easily be confused with fighting. Following this spawning behaviour, the female will swim to a planted area of the tank and lay her eggs. Goldfish lay lots of eggs, and they’re very sticky, so you will easily spot all of them stuck to nearby plants. When the male notices the eggs (which won’t take long!) he will swim over to the area where they were laid and spray sperm to fertilize them.
**What to do with goldfish eggs
Unfortunately, goldfish will eat their own eggs, so you can’t just leave them in the main tank! You must, therefore, remove them from the tank or pond as soon as possible. Remove the eggs (or the whole plant or spawning mop) and put them into the smaller fry tank that you set up earlier. Ensure that the fry tank is a similar temperature to the main tank – between 20°C/68°F and 23°C/74°F. Use a heater to slowly raise the temperature of the water if necessary. Lighter coloured eggs have a much greater chance of hatching, so you can dispose of dark eggs and only keep the lighter ones.
** Feeding goldfish fry
You should not feed goldfish fry straight away. For the first couple of days after hatching, the fry will lie on the bottom of the tank and don’t need any food. It’s only once they start freely swimming around the tank that you need to feed them. Once the fry does start swimming around, but while they’re still too small for fish foods such as Hikari First Bites, you should feed them egg yolk dissolved in water.
Finally, don’t add any fry to the main tank until they are big enough to survive with the other fish. This means that they should be strong swimmers, too big to get sucked into the filter, and bigger than the mouths of the adult fish!
And that’s how to breed goldfish in aquarium naturally.... but this video explains on hand breeding but the fry care are same
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