Koi will also eat fish eggs. So if your goldfish or koi within the pond, your koi may potentially see these as a fair meal!
Goldfish and koi are omnivores, meaning they eat both plants and insects. Both koi and goldfish enjoy duckweed (Leman minor), an invasive pond species. They're often added to ponds to help control duckweed. They will also eat algae, aquatic worms, and vegetable scraps such as finely diced raw peas and carrots. A commercial pellet or flake fish food offers a convenience basic diet for both koi and goldfish.
Koi and goldfish spawn in the spring when water temperatures reach around 68 degrees Fahrenheit. Females release eggs, and several males fertilize the eggs as they are released. Koi and goldfish eat their own eggs if they see them. In the wild, the eggs float to the shallow edges of the pond or lake and attach to water plants, where they remain hidden until hatching. In aquariums, spawning mats offer similar protection.
Goldfish and koi can cross-breed
Koi need more water than goldfish.
We host an annual nationally recognized Koi and Goldfish Show which is held every Memorial Day Weekend with participants and vendors from all over the United States attending.The koi carp and the goldfish are actually fish from the same species family, and while there are of course significant differences between them, they also have a lot of similarities. But this won’t stop larger fish from trying to eat smaller ones!So, if you’re wondering whether koi eat other fish and if it’s safe to keep goldfish and koi carp together, this article will answer all of your questions…If you notice that your goldfish are not surviving alongside your koi or seem to be disappearing from the pond – and if your goldfish are small enough to fit in the koi’s mouth – then it may be that your koi are eating them. However, there are other possible explanations for your goldfish disappearing…Koi carp are unlikely to eat other large fish, including large goldfish. However, if something will fit in their mouths then they may well try to eat it! So smaller goldfish will be at risk.Koi may grow around 1 meter in length, and come in more metallic and sharply red colors than many types of goldfish. The body of a koi is longer and more cylindrical in proportion and shape than a goldfish, which has a more laterally compressed body with bigger fins. Koi use their barbels to dig for food, and cause much greater disturbance to the bottom of their pond or aquarium. They require much larger tanks or ponds than goldfish, and may live for over 60 years.