What Is the Difference Between Koi and Grass Carp? A Quick Guide to Telling Them Apart

Koi and grass carp are both ornamental fish, brightly colored, lively and adorable, and many people like to keep a tank of fish at home, so do you know the difference between koi and grass carp?

1. The difference between koi and grass carp

Koi are colored carp with a bright appearance and brocade-like patterns; grass carp have strong vitality and are easy to care for. The tail of the grass carp is long and graceful, while the tail of the koi is short and powerful; koi have no barbels, while grass carp have barbels. Many of the farmed fish on the market require careful identification when you are choosing them.

2. Can the two be kept together?

It is best not to keep grass carp and koi together. When the water quality is good and fish food is plentiful, the two may get along peacefully. But if fish food is not supplied in time, koi may bite grass carp, leaving the grass carp covered in bites and bruises. Injured grass carp may break out with disease, making koi very easily infected as well.

If the two are kept in the same fish tank at the same time, the koi's adaptability is also relatively weak; the koi may not yet have adapted to the water quality when the grass carp breaks out with disease, and then both may become infected, leading to death.

3. How do you keep koi?

1. Water quality: Ordinary tap water is generally the most commonly used water body in koi breeding; river water, well water and spring water are rarely used by people to keep koi. However, no matter which type of water it is, it contains a certain amount of chlorine. Therefore, dechlorinate it before use.

2. Temperature: The water used to keep fish must be colorless and transparent, with no turbidity; in terms of temperature, 22-28°C is best, and sudden water temperature changes should be avoided as much as possible, with a difference of no more than 2°C, otherwise it will directly harm the health of the koi

3. Feeding: In terms of choosing bait, it is generally divided into natural bait (live bait: bloodworms, earthworms, mealworms, etc.) and artificial bait (growth feed, germ feed and color-enhancing feed, etc.). When feeding, it is best to follow the “four fixed principles”: fixed time, fixed place, fixed quality and fixed quantity, to develop good eating habits.

Koi and grass carp are both relatively common ornamental fish, and when keeping them you need to be very careful to avoid picking up diseases.