How do regular ordinary goldfish mate?

I'm almost certain my two fancy goldfish are male and female,how can I get them to mate or will it just happen when it happens

I have about 5 common goldfish in one tank there is bound to be atleast one male and one female fish...so can they mate?

I got 2 goldfish 2 days ago. They got along well but today they were chasing each other and it looked like it was biting. But they dont have teeth so i dont think it was hurting it. Are they mating?? are they fighting?? they are pretty small. also how...

i really want my fish to have babies but they haven't and how do i tell if they are male or female? please help me!

I have 1 Pearlscale goldfish, 1 Shunkin goldfish and 1 common goldfish. And they all live together in a pond out side and I want them to mate but I dont really know if they can mate or not so I need your help? Plzzz 10pts?

I just recently put my male betta in a tank that conatins two goldfish. The tank is 10 gallons and has a filter as well as a heater. My female and male betta's are ready to mate, but im worried about putting in the female's (2 of them) in with the male...

I also ordered a bubble eye goldfish from the pet store and im wondering if any of those will mate with together.... and how can you tell if the fish are male or female?

So I just got a white Oranda Goldfish with an orange wen! He is really small right now, only about an inch long...Anyways, I was wondering if he needs a tank mate or if he will be perfectly fine by himself? Thanks, and any other info in appreciated!...