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(Cyprinus carpio haematopterus)
Quick Care FactsCare Level: Moderate
Temperament: Peaceful
Maximum Size: 28 - 40"
Minimum Pond Size: 500 gallons
Water Conditions: 55-79° F, 34-85° F temporary water conditions
Diet: Omnivore
Origin: Japan, selectively bred carp
Family: Cyprinidae
Species: Koi, Nishikigoi/錦鯉 (Japanese)
Aquarium Type: Pond
Asagi Coloration and Characteristics
Asagi Koi have a long history dating back to the origins of the breeding of ornamental carp or Koi. They are one of a few varieties that closely resemble Magoi or wild black carp, which means that they have retained much of the size of wild carp and are more hardy than more selectively bred varieties. While the color pattern of the Asagi is not as flashy as some of their Koi pond mates, it does certainly have a subtle elegance that serves to contrast and accentuate more brightly colored varieties.
The Asagi is a fully scaled non-metallic fish with scales above the lateral line exhibiting a dark to light blue coloration, with a red-orange color on their sides, pectoral fins and the sides of their head. Generally the top of the head will be a white color; however, some high quality Asagi will also have some red-orange coloration on the tip of their nose as well. Asagi are one half of a recognized judging variety, with the other half being their Doitsu counterparts, the Shusui.
It is important to examine the scales of young Asagi, as this will determine how it looks as the Koi matures. As the Koi grow, the skin will stretch and the pine cone pattern will become more well defined. Those Koi who exhibit predominantly white scales with small blue dots in the center will finish as a Koi with a deeply contrasted net pattern. Juvenile Koi with darker scales when small will produce a more even and deeper blue color, both of these variations are considered attractive and neither is considered better than the other. It should be noted that small Koi (10 inches or less) will have a darker line in the middle of the head, which should not be considered a defect as this will clear with age.
The following traits are essential for quality Asagi Koi specimens:
  • 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 color, but more often than not 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.
  • Asagi hi, more often than not, shows as a rusty red more so than a bright scarlet red more commonly associated with the Kohaku and other Gosanke varieties. Typically, it runs up from the belly to the lateral line or slightly beyond, in some cases also covering the jaw, cheeks, and some or all of the fins. On the pectorals it can be configured like the motoguro of Showa, or else spread out over the entire area of the fins.
  • Wherever hi (red) appears on an Asagi it should be symmetrical. Some Asagi have a greater than average percentage of red patterning, which can extend almost up to the dorsal fin. These are known as Hi Asagi. Others, known as Taki Asagi, have a white line dividing the areas of red and blue on the flanks. Both these sub varieties are still grouped in Asagi.
Koi Care & Pond Design
Caring for and keeping Koi is tightly tied to the pond in which they live, as the keys to successful Koi keeping revolve around water quality, proper filtration & aeration, quality food and protection from predators. First things first when keeping Koi and that is simply that they get big and need a pond to match. Depending on the number of Koi one plans to keep they need to build a pond that is up to the task of keeping a group of 24" to 30" on average fish that can reach a body mass nearing 30 lbs! While bigger is better, a few rules that will provide a good minimum starting point for an adequate Koi pond include the pond being at least 4 times the length of an adult Koi and 3 times the width, with a depth of around 3 feet. While modern filtration can keep fish alive in very small amounts of water, some reasonable swimming space is required for such large fish and they need some depth to be able to regulate their temperature by swimming closer or further from the surface of the water depending on temperature.
Koi like their common carp ancestors are a cold water fish capable of living in temperatures ranging from the mid 35° F to 84° F they are considered a hardy fish species. However, Koi do not do well if kept at extremely warm or cold water temperatures for long periods of time. They prefer water temperatures ranging from 50° F to 78° F (10° C - 25° C), where they are in ponds that are deep enough for them to regulate their body temperature as they see fit by swimming higher or lower within the pond. The exact ideal depth for a pond depends greatly on the climate where the pond is built, warmer climates can have ponds as shallow as 3 feet in depth, where colder climates will need at least 5 feet deep areas to allow the fish to survive cold winters.
While Koi are fairly hardy fish in general they are selectively bred over hundreds of years for color and pattern, which has made them less hardy than their native carp cousins. Koi are especially sensitive to low oxygen levels and high levels of nitrate in the water. Therefore, proper pond filtration is critical to maintaining high quality water which is crucial to Koi health and longevity. Proper Koi pond filtration should provide high levels of dissolved oxygen, excellent mechanical, biological and chemical filtration and provide parasite control via a UV sterilizer. Partial water changes or the use of plants as a vegetable filter should be used in order to export or remove nitrate from building up in the water.
Second only to the pond design and water quality, Koi need high quality foods that provide them a mix of meaty and plant based food items that will provide a balanced and nutritional diet. Koi should be fed different foods or not at all based on the water temperature and time of year. In the Spring and Fall where water temperatures are between 55° F - 68° F (12° C - 20° C) Koi should be fed foods lower in protein and more easily digestible. When water temperatures are above 68° F or 20° C, then can be fed higher protein foods.
The pond design is also critical in terms of protecting Koi from predators and harsh water temperatures. Ponds that have gradual sloping sides and are shallow in depth allow predators to easily wade into the pond and feed on the Koi within. Also shallow ponds, especially those without shade provided by pond structures or overhead vegetation make it difficult for Koi to avoid the intense sun and high water temperatures during summer months. Koi ponds should have sheer edges that drop down quickly to 2 to 3 feet in depth to deter predators and should have areas of the pond that are deep enough to avoid predators and excessive winter or summer water temperature extremes.
Koi being bred from Carp are an omnivorous fish species, who with their down turned mouths typically eat food items that they scavenge for on the bottom of their natural pond, lake or river homes. However, as Koi are selectively bred in captivity and raised in well maintained ponds, they have adapted to eating food from the surface of the water and will readily consume a wide variety of commercial floating foods designed for Koi.
Many Koi keepers prefer to feed their fish at the surface of the water as it allows them to bond with the fish by training them to hand feed and gives them a chance to inspect the fish for any signs of disease or any wounds brought on from pond predators like raccoons, herons or foxes.
Koi will readily consume a wide variety of natural foods in addition to balanced commercial Koi foods, these include: lettuce, watermelon, peas, oranges, squash and fresh seafoods like prawns, shrimp, scallops, squid, chopped fish, mussels, etc. as long as it is fresh and not pre-cooked or preserved in any way.
Koi should be fed different foods or not at all based on the water temperature and time of year. In the Spring and Fall where water temperatures are between 55°F - 68°F (12°C - 20°C) Koi should be fed foods lower in protein and more easily digestible. When water temperatures are above 68°F or 20°C, then can be fed higher protein foods. In the Winter when water temperatures are below 50°F or 10°C, the digestive system of the Koi will slow nearly to a halt and they should not be fed directly, they may nibble a little on plants and algae, but won't need direct feeding.
Feeding Koi when the water temperature is below 50°F or 10°C runs the risk that any food eaten may not be fully digested and will rot inside the gut of the fish causing illness and possibly cause the Koi to die.
Koi, just like standard Carp when bred naturally will spawn in the Spring and early Summer. Spawning is initiated by the male who will begin following the female about the pond, swimming right up behind her and nudging her repeatedly. After the female Koi is stimulated and releases her eggs, they will sink to vegetation, spawning mobs or even rocks or gravel on the bottom of the pond. The male will release sperm into the water and the eggs will become fertilized and begin developing. Although the female produces large numbers of eggs, many of the fry do not survive due to being eaten by other Koi or because they are not properly fertilized. On average if the egg survives it will hatch in around 4-7 days.
Most pond keepers looking to spawn their Koi will use mop heads or specialized Koi breeding mops in order to be able to control where the eggs are hatched. Since Koi will produce thousands of offspring, of which only a small percentage will carry the proper coloration and pattern necessary to be considered Nishikigoi or Koi. The rest of the offspring will be brown, black, grey or mottled in color and have little to no real color pattern. Professional Koi breeders will cull these undesirable offspring and only raise up the fish that show the desired coloration and pattern.
Nurturing and culling the resulting offspring or "fry" as they are known is a time consuming and tedious job, typically only done by professional Koi breeders or farms. The difficulty in raising quality Koi is in the continual process of feeding, sorting and culling the fry for months on end, while also needing to continually move desirable fish to new and larger holding ponds as they are grown out. Koi breeding at a minimum requires maintaining multiple grow out ponds, having many different types of foods on hand (including live or frozen foods) and performing sorting and culling duties every few weeks for the first year or up to about 6 inches in size. The resulting "Tosai" or yearling Koi will vary in quality from lower pond grade all the way to varying levels of high quality Koi.
While quality parent fish, high quality water conditions and foods provide reproductive advantages for Koi breeders, the semi-randomized results of the Koi reproductive process means that it is possible to get a favorable result even for novice breeders. Additionally the variability in the reproductive process allows for new varieties of Koi to be developed within a relatively few number of generations.
Additional Photos