Asagi
Asagi are fully scaled, nonmetallic fish with a long history, but because they closely resemble Magoi (the wild black carp). Some hobbyists see them as unrefined, dull, and not proper Koi at all. Certainly they are an acquired taste, far removed from the brilliantly tri colored modern Showa or the flashy Koi grouped in Hikariutsuri. But their quiet elegance serves as a counterpart to their more exotic pond mates and they also have the potential to grow very large
Asagi have a long, yet simple history. The Asagi Magoi, one of the three recognized types of Magoi, is said to be the forerunner of all modern Koi breeds. About 160 years ago, two mutants Koi types arose from this probto-Koi, namely the Konjo and the Narumi Asagi. Although instrumental in the development of Matsuba Koi, the dark Konjo Asagi were not seen as having any value, and were kept mostly for food stock. However, Narumi Asagi have gone on to become one half of a recognized judging variety - the other being their Doitsu counterparts, or Shusui.
The prefix "Narumi" is derived from the town of the same name in the Ichi Prefecture, where a locally made fabric can be found, whose weave pattern was said to resemble the pattern on the backs of these Koi. At this time, Asagi seemed to have appeared all over Japan, not just in Niigata and this is when interest in mutant fish led to their being kept back from the food crop and bred together for curiosity's sake, long before Koi were seen as a commercial proposition.
What to look for in Asagi:
Ideally, the back of an Asagi should be evenly covered in scales that are pale blue at the spot where they enter the skin, but are a darker blue as they grow out. The sharper the definition between these two shades, the more impressive the Koi will look. Because the scales are so well defined in this variety, any missing or damaged scales will stand out, seriously devaluing an otherwise good Asagi. The head coloring is an important feature in Asagi that is rarely seen in perfect or near perfect condition. Ideally, it should be a uniform clear white but more often takes on an undesirable blue or grayish tint. In young examples, the bones of the skull show through, but this effect disappears as the translucent skin thickens. If there is a lot of head hi forming a hood pattern, the fish is known as a Menkaburi Asagi.