Koi B - Cyprinus carpio

The beautiful colorful koi (Cyprinus carpio) are called Nishikigoi in Japanese, which means brocade carp. Koi carp can reach a very old age for fish in the garden pond, they can reach 60 years. Adult Koi grow to be around 100 cm long and weigh well over 20 kg.

Our Koi B are a particularly beautiful and large breeding form of the carp (Cyprinus carpio). They are variously patterned in beautiful, brilliant colors. The patterns are each called by different Japanese names. The colorful carp fish are patterned in one, two or three colors depending on the variety. They are available with silvery, greenish, bluish, golden yellow, orange undercolor and with red or black pattern. In our B koi the borders of the colors are sometimes a bit blurred - especially for price-conscious koi keepers the B koi are a nice alternative.

The colorful Koi definitely need the company of conspecifics. They are social carp fish and should not be kept in solitary confinement in the pond , which should not be kept alone. They need a group size of at least five Koi carp of approximately equal size. Color and fin shape of the koi in this initial group is not important, the brocade carp do not make any difference.

The group of koi can be kept in the garden pond either alone, or they can be socialized with rather less lively fish species. For example, rudd, roach or golden tench, moderlieschen or gudgeon are well suited. Koi must not be disturbed during hibernation, because they would use too much energy when waking up. Lively by-fish such as sturgeon are not so good company in the koi pond for this reason.

Koi are gentle giants and therefore need a correspondingly large, sensibly designed pond, which must hold a pond volume of 5000 liters or more for the minimum group size of 5 koi. Each additional koi requires an additional 1000 liters of pond volume. Furthermore, the koi pond must be built at least 130 cm deep. Only then the water does not freeze completely in winter. Only in this way is it possible to leave the koi in the garden pond over the winter, so that you do not have to overwinter them in an aquarium indoors.

Especially for larger specimens, wintering in the garden p ond is much more practical. The pond is not built in full sun or deep shade. An oxidizer for garden ponds brings additional oxygen in the summer, and an ice free holder ensures that oxygen does not become scarce in the winter. A protective net protects smaller koi from voracious herons.

The pond filter in the koi pond must be appropriately sized, because koi have a very active metabolism and can pollute the water relatively heavily. Koi are not a case for unfiltered garden ponds. Algae plagues can be prevented by good filtration. The pond is well planted despite the good appetite of koi for plants. Good edge planting, for example with reeds, provides even better water purification. Koi also do not like to eat water lilies. Through good planting, the pond water remains clear and is not too clouded by floating algae.

If you want to breed koi, you should equip the pond with a sufficiently large shallow water zone on one side, which can also be used for biological filtration - the other pond banks should slope rather steeply. If this shallow pond zone is densely planted, it serves on the one hand to break down pollutants in the pond water and prevent algae plagues, and on the other hand the young fish can hide here from the rather voracious older koi.

For the female koi, spawning brushes or spawning mops can be placed in the pond, where they spawn their more than 500,000 eggs. Moved to the shallow water zone, the fry hatch there in relative safety. Koi offspring in large numbers are selectively brought through in larger numbers when the spawn is moved to a large aquarium for rearing.

Koi eat algae and aquatic plants as well as small animals such as worms, insects, crustaceans and insect larvae which they find by burrowing in the mud at the bottom of the pond. In addition, the koi carp in the garden pond can still be fed with a high-quality koi food - in the cooler season in spring and autumn you give less food, and in summer the amount is increased. In winter, the koi are not fed during hibernation.