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Koi (Cyprinus carpio koi) are ornamental varieties of domesticated common carp (Cyprinus carpio) that are kept for decorative purposes in outdoor koi ponds or water gardens. They are renowned for their vibrant coloration, diverse patterns, and often large size. Originating from Japan, these fish have been selectively bred for centuries to achieve their distinctive aesthetic qualities. While genetically identical to the common carp, their phenotypic expression has been dramatically altered through artificial selection.
Ciri-ciri Fizikal
- Bentuk badan
- torpedo
- Warna
- Extremely diverse, including white, black, red, orange, yellow, blue, and cream. Patterns can be solid, bi-colored, tri-colored, or multi-colored, often with metallic or pearlescent sheens. Specific varieties are recognized by their distinct color combinations and patterns (e.g., Kohaku, Sanke, Showa, Ogon, Asagi).
- Jenis sisik
- cycloid
- Kedudukan mulut
- subterminal
- Ciri tersendiri
- Two pairs of barbels on the upper jaw, characteristic of carp., Large, prominent scales (though some varieties like Doitsu have reduced or absent scales)., Robust, elongated body., Vibrant and highly variable color patterns.
- Sirip dorsal
- Single, long dorsal fin with a strong, serrated spine at the anterior end.
- Sirip ekor
- Large, deeply forked caudal fin.
- Sirip pektoral
- Paired pectoral fins, typically rounded.
- Sirip tersendiri
- Pelvic fins are also paired and located abdominally. All fins can exhibit coloration matching the body.
Petua Pengenalan
Barbels
Presence of two pairs of barbels around the mouth, distinguishing them from goldfish which lack barbels.
Size
Koi typically grow much larger than most goldfish varieties, often exceeding 2 feet (60 cm) in length.
Body Shape
More elongated and torpedo-shaped compared to the generally more rounded or egg-shaped body of many goldfish varieties.
Coloration and Pattern
While both can be colorful, koi patterns are often more defined and follow specific, recognized varieties (e.g., Kohaku, Sanke), whereas goldfish patterns are more varied and less formally categorized in the same way.
Habitat
- Jenis air
- freshwater
- Kedalaman
- Typically kept in ponds with depths ranging from 3 to 8 feet (1 to 2.5 meters) or more, especially in regions with cold winters.
- Persekitaran
- Artificially created and maintained outdoor ponds, water gardens, and large aquariums. They are not naturally found in the wild in their ornamental forms, though feral populations of common carp (from which koi are derived) exist globally.
- Julat geografi
- Cultivated worldwide, with primary breeding centers in Japan, but also significant production in China, Israel, and the United States. Feral populations of common carp are widespread across Europe, Asia, North America, and Australia.
Maklumat Akuarium
- Tahap penjagaan: intermediate
- Perangai: peaceful
- Diet: omnivore
- Saiz tangki minimum: 1000 gallons (for a few small koi, significantly more for larger or multiple fish)
- Suhu: 39-77°F (4-25°C)
- Tahap pH: 7.0-8.0
- Kekerasan air: 100-250 ppm (5-14 dGH)
- Keserasian: Generally compatible with other large, peaceful pond fish such as goldfish. Avoid housing with aggressive species or very small fish that could be prey.
- Keperluan khas: Koi require large, well-filtered ponds with adequate depth (at least 3-4 feet in temperate climates for overwintering). Excellent water quality is paramount, necessitating robust filtration systems (mechanical and biological) and regular water testing. They benefit from varied diets and can be trained to hand-feed. Protection from predators (e.g., herons, raccoons) is often necessary.
Maklumat Liar
- Status pemuliharaan: least concern
- Musim: Koi are active year-round in suitable climates. In temperate regions, their metabolism slows significantly during winter, and they enter a state of torpor, resting at the bottom of the pond. Feeding should be reduced or stopped below 50°F (10°C).
- Harga pasaran: Highly variable, from a few dollars for common varieties to hundreds of thousands for show-quality specimens.
- Kepentingan komersial: high
- Rasa: While genetically common carp, koi are not typically consumed due to their ornamental value and potential for bioaccumulation of pond treatments. Common carp flesh is often described as earthy or muddy.
- Tekstur: Flaky, but can be somewhat coarse.
- Kaedah memasak: Frying, Baking, Smoking
- Nilai pemakanan: Similar to common carp: good source of protein, omega-3 fatty acids, and B vitamins, but often contains intramuscular bones.
Fakta utama
Longevityrecord
Koi are known for their impressive longevity, with some individuals living for 50 years or more 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.
Genetic Originevolution
Despite their diverse appearance, all koi varieties are genetically the same species as the common carp (Cyprinus carpio). Their distinct forms are a result of centuries of selective breeding.
Intelligencebehavior
Koi are surprisingly intelligent and can be trained to hand-feed, recognize their owners, and even perform simple tricks.
Maklumat keselamatan
Selamat- Tahap keselamatan: safe
- Berbisa: Tidak
- Kebolehmakanan: not recommended
- Nota pengendalian: Koi are generally docile. When handling, use a soft net or koi sock to minimize stress and prevent damage to their delicate slime coat and fins. Support their body fully if lifting. Avoid prolonged exposure to air. Large koi can be powerful and may thrash, requiring careful handling to prevent injury to both fish and handler.
Spesies serupa
Common Carp
Cyprinus carpio carpio
Koi are selectively bred ornamental varieties of the common carp. Wild common carp typically have a duller, olive-brown to brassy coloration, often with a uniform appearance, lacking the vibrant colors and distinct patterns of koi. They also tend to have a more robust, less refined body shape.
Goldfish
Carassius auratus
Goldfish lack the barbels present on koi. They generally have a more compact, rounded body shape and typically do not grow as large as koi. While goldfish also come in many colors and fin types, their genetic lineage and specific varieties are distinct from koi.
Klasifikasi saintifik
- Kerajaan
- Animalia
- Filum
- Chordata
- Kelas
- Actinopterygii
- Ordo
- Cypriniformes
- Keluarga
- Cyprinidae
- Genus
- Cyprinus
- Spesies
- Cyprinus carpio
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