Asagi Koi 21.26 inch, The Asagi is one of the oldest breeds of the beautiful koi. Stoic and subdued, and sometimes even considered an acquired taste, you’re sure to see this common blue-scaled koi around in a pond near you.

Asagi offspring tend to be a spitting image of the typical Asagi koi – blue nonmetallic scales, reticulated diamond-like scale pattern, and splotches of red coloration, called hi. These appear on the gill plates, belly, and tail. These red areas can also appear on the koi’s dorsal fin. The red hue that develops in Asagi koi is less of a bright red and more of a rusty color. The hi sometimes spreads as koi age.

Asagi koi that have more red pigmentation than usual are called Hi Asagi. Another variation on the typical Asagi koi is called Taki Asagi. These koi look just like your typical Asagi, but they have an additional line of white scales between its red and blue pigmentation. Red eyes are also desired in Asagi koi.

While Asagi koi produce many typical offspring, few are seen as perfect or faultless. This is one reason why the Asagi koi are recognized as an acquired taste. In  the ideal Asagi koi, symmetry is favored. This oftentimes disliked requirement in koi is actually admired in the Asagi lineage. The symmetry that is idealized in Asagi koi pertains to their red patches. The red areas should be defined and clean – any spotting or straying of red pigment on the head or scales is recognized as an imperfection. And because the blue scales are so distinct, any patches of missing scales are very apparent and are seen as a major fault. For the ideal Asagi koi, red eyes are desired.

Experience Level: Intermediate

Size: Koi grow up to 36 inches (91 cm) long

Lifespan: They can live for more than 50 years and thrive in a wide range of water temperatures

Temperament: They are generally peaceful but may pick on slower fish

Origin: They’re a type of carp native to Japan

Did You Know: Koi can learn to recognize and take food from their pet parents

How do I set up my koi’s aquarium?

Koi grow quickly and get very large. Keep mature koi in an outdoor pond of at least 3 feet deep, with at least 50 gallons of water per fish.

Young koi can be kept indoors in an aquarium of at least 29 gallons.

Put the aquarium in a quiet area out of direct sunlight and drafts.

Cover the aquarium with a hood to reduce evaporation and splashing and to keep fish from leaping out.

To transfer new koi to the aquarium, float them in the water inside their bag for about 10 minutes so they can acclimate to the new water temperature.

If you’re introducing koi to an existing school in an aquarium or pond, quarantine the new fish in a separate body of water for 2 to 4 weeks to be sure they are healthy.

On moving day, use a net to transfer the koi so old water doesn’t mingle with new water.

Whether they live indoors or outdoors, add no more than 3 new koi at a time.

Outdoor koi are hardy and will hibernate under ice in winter as long as their pond is deep enough to not freeze completely. (They won’t survive in solid ice.)

Your koi’s pond should be partially shaded.

Indoor koi prefer water between 65 and 75 degrees Fahrenheit.

Install a light inside an indoor aquarium to illuminate it for 8 to 12 hours a day.

Water temperature

Koi are pretty temperature-resistant— they can even hibernate under ice in winter. Just be sure your pond is at least three feet deep— otherwise, it could freeze solid, and koi aren’t that tough. When they live indoors, koi prefer cool water—between 65 and 75 degrees F (18 to 24 C).

If your outdoor koi don’t seem to be eating in the winter, don’t worry; it’s normal for them to stop eating at temperatures below 40 F. Be sure to contact a veterinarian if you notice any of these symptoms:

Unusual swimming pattern

Thinness or decreased appetite

Abdominal swelling

Inflamed or discolored skin or fins

Fins clamped to sides of body

Scraping body on rocks (flashing)

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