In order to have healthy fish, you must feed them with the right fish food to keep them in good shape. And because of this, it's really important for you to know the nature of your pets when it comes to taking care of their diet.

Generally, Koi are omnivorous fish that feed on both meat and plants alike. They have sharp appetites when water temperature falls around 61 to 71 degrees Fahrenheit. Summer is when they're most active in their appetites, and this is the reason why they should be fed with nutritious food.

They eat almost anything that comes in their way, ranging from insects, worms, snails, to the foliage of underwater plants (which could sometimes give their owners quite a bit of a headache!). Some of them would also feast on those acorn and grasses which they manage to eat by pulling themselves part of the way out of the water!

Wintertime, however, is when their digestive system slows down, almost to a stop. During this time, there's no need for you to feed them. Why? It's because they may take the liberty of nibbling on the algae that can be found at the bottom of the pond (or any available natural food there is). But there's one thing that you must always keep in mind:once the temperature will reaches 50 degrees Fahrenheit, any food that will be left and stored in their stomach will become rancid, making them sick.

So, what are the healthy treats that you can provide your pets? Keep in mind that they need to have the proper combination of vitamins, minerals, fats and protein. To get these, feed your fish with pellet foods, which can be made to float on the top of the water so that they'll come out of the water's surface to eat it.

In addition to this, you can also feed them with special treats like watermelons, peas and lettuce. Be careful though in feeding them with food such as corn, beans and grapes, as they contain an outer casing, which can't be properly digested if swallowed by your pet. Make sure to remove the outer casings before feeding.

Other treats include bread (which can be broken down, rolled into small balls and thrown into the pond), prawns (edible crustaceans which has similarities to shrimp, only that they are bigger), fruits (but should only be fed occasionally, as most of them have high amounts of natural sugar) and lettuce (high in essential vitamins and minerals).

So as their owner, ensure that your fish are in good health and also free from injuries. Since they're appetites are so great, be very careful on how and how much you feed them. In feeding your Koi with food, you can take the pleasure of your fish's willingness to interact with you. A fish with a healthy diet will have vivid colors, making them even more attractive to the sight of the people.