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Choosing Koi
Freshwater Species by: Dr. Amy Wolff
Related Articles
Koi are cold water fish, thriving best in temperatures between 61 and
75 degrees Fahrenheit.
Koi (Cyprinus carpio) are members of the carp family, the largest family
of fish. Unlike their wild cousins, koi are colorful and prized for their
exotic appearance and longevity. Koi can grow as large as 3 feet and reach
mature length in as little as 3 years. With good care and proper environment,
they can live to be 60 years old. Because of their large size, and long life
span, koi are best suited to ponds or pools, rather than in-home aquariums.
Husbandry
Koi are cold water fish, thriving best in temperatures
between 61 and 75 degrees Fahrenheit. At this range their appetites are keen
and they give the best appearance of their colors and patterns. Koi are
omnivorous, meaning they will eat a variety of foods, such as insects, worms,
snails and plants. Most often they are fed a diet formulated specifically
for koi in a pelleted form. Koi become sexually mature at 18 to 36 months.
They are egg layers and become interested in breeding as the water temperatures
begin to warm in the spring. During this time, they are often very destructive
to ornamental plants, so valuable plant specimens may need to be protected
or moved. Koi can be aggressive to other fish, even their own smaller offspring.
The smaller fish may need to be separated from the larger ones for a time
until they are large enough to mix with the older population. Koi can be
mixed with larger goldfish or catfish, even a large algae eater.
When you purchase your koi, look for active fish with good appetites.
Koi will eat food anytime it’s offered; have the garden center offer
food to the fish you are interested in so you can see they are eating. Look
for any signs of illness, clamped fins, sores or red spots on the body or
fins. Do not buy any fish that appears listless, or is at the surface gasping
for air. Sick fish are very hard to treat and can be a constant source of
disease for your pond even after they are gone.
Summer Care
During active summer months, feed your fish a good quality diet designed
for koi. The most common type is a pellet that is made to float at the surface
of the water. Offered at the same time of day and at the same location in
the pond, you will be able to observe your fish as they surface to eat. This
will give you an opportunity to see your koi, make sure their appetites are
good, and look for any injuries or diseases. If you live in an area where
wildlife predators are a concern, smaller ponds can be covered with a protective
netting to discourage raccoons, foxes, etc. from taking a meal. The netting
also serves to keep leaves and other debris from getting into the pond and
fouling the water.
Water quality is the single most important factor in the health of your
fish. Keep the number of fish in the pond relative to the number of gallons
of water your pond holds. When koi are small, you can use the standard 1-inch
of fish per gallon of water. This means that 5-six inch fish can live in
30 gallons. But, as koi grow, this ratio doesn't work well. One 30-inch koi
will have a difficult time thriving in a 30-gallon area. In the case of koi,
bigger is better. The more space you can provide for your fish, the healthier
they will be. If your fish are becoming too large for your pond, either enlarge
the pond or try to trade a large koi for a smaller one at local pet stores
or garden shops. Watch for overpopulation. If your koi are blessing you with
a lot of offspring, it's time to share with the neighbors. A pond filter
will help control the delicate biological balance in pond systems and help
control the amount of waste produced by the fish. There are a number of different
types available for all sizes of ponds. Keeping a few live plants in the
pond will help deter the growth of algae, but choose sturdy, strong rooted
specimens as these fish love to disturb plants.
A small fountain or pump to provide movement at the water surface will
keep your pond oxygenated. Your local aquatic store can help you test for
toxic waste levels in the water such as ammonia or nitrates, or you can use
one of the many easy-to-use home kits. When establishing your pond, add only
one or two small fish every 2 weeks to avoid overloading the filter with
waste products. Remember, your fish are dependant on the pool's natural
filtration system to detoxify the waste they produce. If you add too many
fish too quickly, ammonia levels will rise and you may lose your fish.
Winter Care
If your pond or pool is deep enough, your fish can spend the winter outside.
Typically, the deepest part of your pond should be no less than 3 feet or
18 inches below the frost line. A heat source should be added to keep the
water from freezing. As winter temperatures fall, your fish will begin winter
hibernation. Stop offering them food when the water temperature drops to
50 F.
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Types of Koi
Koi are classified as metallic or nonmetallic, and differ on the appearance
of scales and color patterns. A few examples are listed below:
Non-Metallic
Bekko - White, red or yellow with black markings
Kohaku - white with red or black
Taisho sanke - white with red or black
Metallic
Hikarimono - Single colored
Hikari-utsurimono - black with white, red, or yellow
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