How Do Goldfish Mate?

Answer

Gold fish are oviparous meaning that the eggs develop outside the mother's body with the male and female fish shedding their gametes into the surrounding water. However, a few oviparous fishes practice internal fertilization, with the male using some sort of intromittent organ to deliver sperm into the genital opening of the female, most notably the oviparous sharks, such as the horn shark, and oviparous rays, such as skates.
2 Additional Answers
The male goldfish will follow the female around and push against her abdomen. The female goldfish will lay eggs after they mate. The eggs attach to the vegetation. You can find more information here: http://www.aquaticcommunity.com/breeding/goldfish.php
Goldfish reach sexual maturity around the age of nine months. The males will develop 'breeding tubercules', which are white spots that appear on their fins. The females will become swollen with eggs.Courtship consists of the male swimming doggedly behind the female, bumping his head into her genital area and basically harrassing her until she either attacks him or decides she'd like to mate with him.Mating involves the male spraying sperm over the female's eggs as she lays them. The eggs will then sink to the bottom, where the oftentimes forgetful parents may gobble them up if they are not removed from the fish tank or pond and placed in separate accommodations.It takes one to two weeks for the eggs to hatch.
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