Adult koi fish eat the vegetables, breakfast cereals, and other stuff listed above. Although Gourami fish are aggressive, due to their smaller size, the can’t harm Koi fish. Smaller koi will leave them alone simply because they can't eat them yet, while larger koi will usually eat them if given the chance.Tadpoles, however, will also sometimes eat the food you feed your koi.A simple solution is to remove the tadpoles and/or eggs you see in the koi pond. So if you don’t have some of them in your garden pond, get some quickly.

Koi fish eat just about anything, from small bugs and insects, to plants and algae at the bottom of the fish pond, to store-bought koi fish food. Koi fish metabolism is affected by the surrounding weather. those animals may be passing through to eat your koi fish while others (frogs, some waterfowl, salamanders, etc.) If it gets cold enough their metabolism totally shuts down and they won’t eat when the water temperature dips below 41°. may decide to make their home in it. The temperature is dropping. So, make sure the tank temperature is suitable for both of them.

Koi fish is omnivorous and eats anything from insects to aquatic plants. Koi will even eat people food. Koi Fish (Cyprinus carpio) Koi’s are all time favorite of pond owners for their colorful body. h3. A garden pond without Koi is incomplete.

3) What time of year is it? However, doing some research on the predators that are present in your area can go a long way toward protecting your koi fish.

Winter is almost here. Again temperature is also an issue because gourami is a tropical fish and koi is a coldwater fish. But you shouldn’t keep gourami with large adult koi fish, koi may eat them. They love cereal, lettuce, shrimp, rice, peas, watermelon pretty much anything we like, koi fish consider food.