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Koi (Cyprinus carpio) are ornamental varieties of domesticated common carp that are kept for decorative purposes in outdoor koi ponds or water gardens. They are renowned for their vibrant coloration, diverse patterns, and impressive size. Originating from the common carp, they have been selectively bred in Japan for centuries, resulting in a multitude of distinct varieties. Their robust nature and longevity contribute to their popularity.
身体的特徴
- 体形
- torpedo
- 体色
- Extremely diverse, including white, black, red, yellow, blue, and cream, often in combinations. Patterns are highly varied and define different varieties (e.g., Kohaku, Sanke, Showa, Utsurimono, Asagi, Shusui, Ogon).
- うろこのタイプ
- cycloid
- 口の位置
- subterminal
- 特徴的な部位
- Two pairs of barbels on the upper jaw (one short, one long)., Large, prominent scales (except for 'Doitsu' varieties which have few or no scales)., Robust, elongated body., Vibrant and distinct color patterns.
- 背びれ
- Single, long dorsal fin with a strong, serrated spine at the anterior end.
- 尾びれ
- Large, deeply forked caudal fin.
- 胸びれ
- Paired pectoral fins, typically rounded.
- 特徴的なひれ
- Pelvic fins are also paired and located abdominally. All fins can exhibit coloration matching the body.
識別のコツ
Barbels
Presence of two pairs of barbels on the upper jaw is a key characteristic distinguishing carp from many other freshwater fish.
Coloration and Pattern
The vibrant and often intricate color patterns are unique to koi and are used to classify their numerous varieties.
Body Shape
Their robust, torpedo-shaped body is characteristic of the common carp lineage.
生息地
- 水質タイプ
- freshwater
- 生息水深
- Prefer deeper waters (1-3 meters or more) in ponds, lakes, and slow-moving rivers. Can tolerate a wide range of depths.
- 環境
- Originally found in temperate freshwater environments, including rivers, lakes, and ponds with muddy or vegetated bottoms. Domesticated koi are exclusively found in artificial ponds and water gardens.
- 分布域
- The wild common carp (Cyprinus carpio) is native to Central Asia and Eastern Europe. Domesticated koi were developed in Japan and are now distributed globally through aquaculture and ornamental trade.
アクアリウム情報
- 飼育難易度: intermediate
- 性格: peaceful
- 食性: omnivore
- 最小水槽サイズ: Koi are not suitable for typical aquariums due to their large size. A minimum of 1,000 gallons (3,785 liters) per fish is recommended for ponds, with significantly more for multiple fish.
- 水温: 39-77°F (4-25°C)
- pH値: 6.8-8.0
- 硬度: 5-15 dGH
- 混泳の相性: Generally compatible with other large, peaceful pond fish such as goldfish and other koi. Avoid housing with aggressive or very small fish that could be prey.
- 特別な注意点: Require large, well-filtered ponds with adequate depth (at least 3 feet, preferably deeper in cold climates) to prevent freezing. Good aeration is crucial. They are social fish and thrive in groups. Protection from predators (e.g., netting) may be necessary.
野生での情報
- 保全状況: least concern
- 旬の時期: Koi are active year-round in temperate climates. In colder regions, they enter a state of torpor during winter, reducing activity and feeding. Spawning typically occurs in spring when water temperatures rise.
- 市場価格: Varies widely from a few dollars for common varieties to hundreds of thousands of dollars for highly prized show-quality specimens.
- 商業的重要性: high
- 味: While genetically the same species as common carp, ornamental koi are generally not consumed. Common carp meat is often described as earthy or muddy, depending on water quality.
- 食感: Flaky, firm.
- 調理法: Frying, Baking, Smoking, Grilling
- 栄養価: Common carp is a good source of protein, omega-3 fatty acids, and B vitamins.
重要な事実
Longevityamazing
Koi are known for their impressive lifespan, often living 25-35 years, with some individuals exceeding 50 years under optimal conditions. The oldest recorded koi, 'Hanako', reportedly lived for 226 years.
Cultural Significanceinteresting
In Japanese culture, koi symbolize love, friendship, perseverance, strength, and good fortune. Their ability to swim upstream against currents is seen as a metaphor for overcoming adversity.
Variety Classificationinteresting
There are over 100 recognized varieties of koi, each distinguished by specific color patterns, scale types, and body shapes. Major categories include Kohaku, Sanke, Showa, Utsurimono, and Ogon.
Intelligence and Trainingbehavior
Koi are surprisingly intelligent and can be trained to eat from their owner's hand, recognize individuals, and even perform simple tricks. They are known to be quite social.
Winter Torporbehavior
In cold climates, koi enter a state of torpor during winter, where their metabolism slows down significantly. They stop feeding and remain largely inactive at the bottom of the pond until temperatures rise.
安全情報
安全- 安全レベル: safe
- 有毒: いいえ
- 食用性: not recommended
- 取り扱いに関する注意: Koi are generally safe to handle, but care should be taken to avoid damaging their scales or fins. Use wet hands or a wet soft net to minimize stress and protect their slime coat. Large koi can be powerful, so handle with caution to prevent injury to both fish and handler.
類似種
Common Carp
Cyprinus carpio
Koi are ornamental varieties of the common carp. Wild common carp typically have a duller, olive-brown to golden-brown coloration and lack the distinct, vibrant patterns of koi. Their body shape is generally more elongated and less 'deep-bodied' than some highly bred koi varieties.
Goldfish
Carassius auratus
Goldfish are generally smaller than koi, lack barbels, and typically have a more rounded or egg-shaped body. While goldfish also come in various colors and fin types, their overall morphology and scale patterns differ significantly from koi.
Crucian Carp
Carassius carassius
Crucian carp lack barbels and have a deeper, more compressed body than common carp or koi. They are typically golden-bronze in color and do not exhibit the diverse patterns of koi.
学名分類
- 界
- Animalia
- 門
- Chordata
- 綱
- Actinopterygii
- 目
- Cypriniformes
- 科
- Cyprinidae
- 属
- Cyprinus
- 種
- Cyprinus carpio