How to breed Goldfish

Introduction
Breeding goldfish is not easy as you thought, especially if you are a beginner. Breeding goldfish is fun, but not an easy task to do. It is how much you love your goldfish and keeping any detail information about your fish. Goldfish may only grow if the nutrition and water is kept right. I breed goldfish for some years from 6-12 months. But, the best way of breeding goldfish is on their 12th months and up.

How to sex goldfish

Males - have breeding tubercles or white "stars" on their gills and pectoral fins. Don't confuse with Ich. When they're ready to spawn, the "vent" becomes open and is longer than usual.
Females - are more rounded if you're looking from the top (swollen abdomen = ovaries filled with mature eggs) when she is ready to spawn, the "vent" becomes protruded.
In my experience, the easiest way to know the sex of a goldfish is the "white dots" on their pectoral fins, usually 5 or more. If you see that, then that's a male. Easy? Isn't it?

Tank Setup
55 gallons will do. First, fill the tank with water up to 50% and add some water dechlorinator and a sponge filter. Make a net filter,10x15inch well it's a net that looked like a box. It is like a strainer, this will do the trick later on.
Run the water for 24hours to make sure that other chlorine has been fully removed.

Signs of breeding goldfish
Males will become highly aggressive, chasing female and bumping their heads on the belly. The male goldfish encourage the female to lay eggs, and therefor the male will fertilize the eggs.

Next
Submerge your plastic net(aka strainer) atleast 7 inch deep. Make sure your fish can swim well. Leave them for 24 hours. Usually goldfish breeds from 12midnight till morning. So expect to have a smile when you wake up.