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sciencing.com/do-fish-reproduce-freshwater-ponds-6630942.html

Documented evidence of the first koi ponds date back as far as the 1600s. Adult koi are relatively hardy fish. They can survive in cool temperatures, and do well in a variety of indoor and outdoor environments. These fish have a lifespan of over 20 years, and can reach lengths of 25 to 36 inches.

fullserviceaquatics.com/fish-food/old-koi-need-spawn

Hello I have 3 koi fish that are about a year old, and I was wondering if they can in fact mate and lay eggs that are fertilized and will hatch into baby koi fish.. I am asking because before my husband and I got our fish I was reading about them online and it said that typically they don’t reach sexual maturity until the males are about 2 ...

www.koi-pond-guide.com/breeding-koi.html

Pretty Koi parents do not necessarily make pretty babies, so choose parent fish on the strength of their body shapes, good quality color, and good scalation rather than looks alone. Do not use show quality koi for breeding; they will suffer bruises, cuts, torn fins, and missing scales, as well as stress during spawning.

fullserviceaquatics.com/koi-pond/koi-and-goldfish-spawning-in-your-backyard-pond

Koi will do much better with the classic goldfish, but the more ornamental varieties goldfish are very delicate. Any goldfish that is highly specialized with protruding eyes, bubble eyes, unusual body shapes and fin configurations should be reserved for aquarium keeping. Classic goldfish and shubunkins tend to do best with koi.

www.wikihow.com/Breed-Koi-Fish

Leave the koi to mate. This process can happen immediately or can take a few weeks. Don’t worry if the koi don’t look interested in each other initially. A storm, full moon or change in air temperature can help encourage the koi to mate, so be patient and let nature take its course.

www.reference.com/pets-animals/pond-fish-breed-f5622d8de4f9239d

When Do Pond Fish Breed? Pond fish generally start breeding in the spring or early summer. The rising water temperatures and lengthening days signal sexually mature fish to begin spawning. Although common pond fish, such as koi and goldfish, spawn spontaneously in the spring, owners of ponds can promote early spawning by using a submersible ...

www.fishkeepingworld.com/how-do-fish-mate

So, how exactly do fish reproduce? To understand how fish mate, it’s important to understand their reproductive organs. For fish to reproduce, sperm and an egg must be combined to create new life. Whilst there are a few different ways in which this can occur, one common factor is the reproductive organs involved; the ovaries and the testes.

animals.mom.me/long-goldfish-mate-lay-eggs-10454.html

Technically speaking, goldfish don't actually mate. Instead, goldfish spawn, which is a process that begins with the males chasing the females around in a madcap fashion, often causing mild injuries to the fish, and ends with the female releasing her eggs into the water and the male releasing sperm to fertilize the eggs.