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Butterfly Koi: Basic Facts To Know

4/16/2018

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By: Aquascape, Inc.

Quite a few of the koi connoisseurs think of butterfly koi as “mutts,” and some say that butterfly koi aren’t even koi. Others, however, happen to think butterfly koi can be the finest koi in any collection, depending on several factors – size, pattern, and finnage.

First, let’s consider where butterfly koi originated. In the early 80s, a population of common, brown and grey carp with long fins were found in a series of canals and ditches in Indonesia. A company in New York took an interest and brought the fish into the U.S. and sold some. They did not sell well because they were ugly. However, an enterprising and curious group of breeders at Blue Ridge Fish Hatchery placed an order for a dozen of these fish to see what the heck they were. Ugly, with long fins, is what they discovered. Over the next several years they bred these large, long finned mutations with their finest regular-fin koi and made several discoveries.
  • Long-fin genes are dominant, so breeding the fish back to color would not breed out the long fin gene.
  • Long-fin koi are robust and disease resistant.
  • The fish could be bred back to color and many colorful lines of long-fin koi have been created at Blue Ridge Fish Hatchery.
The original breeder at Blue Ridge Fish Hatchery who spearheaded the cultivation of long-fin koi was a man named Wyatt LeFever. His son Randy made his way to the tanks to see the fish. As he regarded the fish with interest, he observed, “Dad, they look like Butterflies!” The name stuck.

The Relation of Size and Value

As Butterfly koi grow, they become more and more impressive because the fins keep growing until the blood vessels can’t sustain the fins to be any longer. The older the fish, the longer and more impressive the finnage. So, a full-grown butterfly koi looks like a long, slinky dragon moving through the water. Their barbels (whiskers) even grow long and can fork into elaborate designs.

Butterfly koi seem to lack some of the body size of regular koi, but the overall fish can run as long as 36 to 40 inches in the right pond with plenty of food. They are graceful and pleasant to watch swim.
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Butterfly Fin Koi Fish
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Standard Fin Koi Fish

What About Pattern???

Since pattern seems to mean a great deal to the value of a regular koi, it makes logical sense that a good, standard pattern with bright colors would increase the value of a butterfly koi too, but there are a few notable additions. While a butterfly koi is more valuable when it has a properly defined and positioned pattern in the color, beautiful fins can often make even a poorly patterned fish look beautiful.
In addition, lemon and platinum ogons (solid color) in the butterfly category are awesome as adults. When you grow a metallic yellow or platinum ogon butterfly to an impressive, large size, their body movement is more graceful and slow. The fins are long, but the uniform gold or neon-white color is brilliant in the water and such fish look like fireballs or comets moving through the water with their “fire” (fins) streaming behind them. Gorgeous!

Notable Butterfly Koi Types:

Sorogoi are incredible as adults in the butterfly class, as well. A sorogoi is the overall grey fish with the “fukurin” or black fish net pattern over the body. So, taking that color and putting it on a large, impressive adult butterfly koi gives you what rather appears as a grey sea monster moving through the water. Its subdued colors don’t attract the eye at first, but then you see its graceful, lengthy body and fins moving around below you and you are taken aback by both the robustness of the fish (they grow huge) and its mysterious, grey color.

Even better than that are black butterflies – which are, by far the coolest fish. They are seldom found, so the effect is rare and special when it happens. The black butterfly may be with or without scales. The rarest and most valuable of this type is the doitsu, karasu butterfly. This fish is black, has no scales, and has long fins.

Black Beauties:

Black butterflies grow up and become very large because their genes are not as strained as some of the brighter colored fish. And if they have no scales, the body is a glistening jet-black. The fins keep growing until the entire fish is broad, and streams long black robes behind it. They look like a jet-black dragon.
And when a visitor to your pond is feeding your fish at the side of the pond, suddenly, a large black shadow looms up from the depths. Larger it gets, until they realize that there is no color, the fish is just a shadow and when the fish takes the food, it turns and swirls down out of sight with a flourish of long, black fins. “What was that?” they usually stammer. “That is the shadow. He’s our black fish, which the Japanese have always regarded as a lucky fish,” you reply. The fully mature black butterfly koi is surely one of the most memorable fish a kid could ever encounter or feed. With such a fish, you own a living breathing shadow dragon.

Oh, Those Fins!

In a discussion of butterfly koi, we should talk a tiny bit more about the fins. The butterfly koi fins are long because of a genetic aberration resulting in the length growth gene failing to turn off. In fish, the fins are supposed to grow to a genetically specified length, and then stop growing. But in the high fin mutation the fins don’t get the “stop growth” message and they keep growing. This happens in individual fish of many species from time to time. Some notable examples are Siamese fighting fish, Simpson’s hi fin swordtails, long fin oscars, and long fin black tetras. Any time the mutation is encountered and identified, it is bred into a species to see if it would make that species more economically important commercially.
Like any other koi, the fins of the butterfly koi are made up of dozens of rays of cartilage that radiate outward and support the fin. These rays generally grow very straight, but past the point of normal length they can grow wavy. The fish that grow straight rays even into the lengthier parts of the tail are more impressive looking and would be more valuable.
One problem with butterfly koi is that they are often handled the same way as regular koi. Broken fins and tails are par for the course by the time the fish is an adult. So, it’s normal to see bends and waves in the fins and tail of butterfly koi partly because of growing that way, but also because of netting-damage as a juvenile. As an adult, a split tail or fin often does not heal well and remains split. All of the above is irrelevant to the casual observer, the impact of the fish is exactly the same, but you might notice variations in fin quality and you may care enough to choose one fish over the other based on that.

Are Butterfly Koi REAL Koi?

The butterfly koi is a true koi. Despite this fact, the Japanese have shared some American purist’s distaste for these long fin beauties. Truth be told, the Japanese have usually reacted to any new color, at first, as an abomination. Eventually, they get used to it and accept it, and eventually love the diversity.
And it has been that way with the butterfly koi. At first, Mr. Suda was the only breeder in Japan producing butterfly koi. His fish have been gorgeous, and he even bred them for prodigious size. But the rest of the Japanese breeders declined.
Mr. Suda’s fish became so popular in the U.S. that they became scarce; making Mr. Suda realize his decision to breed them was a good one. Over time, as other breeders watched Mr. Suda sell everything he had very fast, they eventually overcame their resistance to butterfly koi and started producing them, too. Today, there are domestic breeders who compete in the butterfly koi market. They are very popular fish – and for good reason.

So Now What???

Located in Lebanon, Pennsylvania, Dreamscapes Watergardens installs koi fish ponds and pondless waterfalls (disappearing waterfalls) all over the Central Pennsylvania area. For more information on koi ponds and waterfeature installations, please contact us directly!

Dreamscapes also carries a full line of pond supplies from water treatments and fish medications to pond pumps, heaters, fountains, plants and fish! Tadpoles and snails are also available at our Aquatic Retail Center in Lebanon, Pennsylvania seasonally while supplies last from May-August.  If you think you need it, we have it!

Retail Hours:  April 5th-October 27th 2018:
                           Monday-Wednesday: By Appt
                           Thursday-Friday: 10am-5pm
                           Saturday: 9am-12pm
                     October 28th-April 2019: HOURS BY APPT


Contact Us
2155 State Route 343, Lebanon Pa | 717-272-6555 | [email protected]

Dreamscapes Watergardens services the city of Lebanon, Lancaster, Harrisburg, Mechanicsburg, Camp Hill, Cleona, Cornwall, Fredericksburg, Indiantown Gap, Jonestown, Kleinfeltersville, Mount Gretna, Myerstown, Newmanstown Palmyra, Quentin, Reistville, Richland, Schaefferstown of Pennsylvania, PA
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