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Carassius auratus, commonly known as the goldfish, is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most domesticated fish, originating from selective breeding of Prussian carp (Carassius gibelio) or crucian carp (Carassius carassius) in ancient China. Goldfish are known for their vibrant colors and diverse body forms, which have been developed through centuries of artificial selection. They are highly adaptable and can tolerate a wide range of environmental conditions, making them popular as ornamental fish in aquariums and ponds worldwide. In the wild, feral populations can become invasive.
Fysiske karakteristika
- Kropsform
- rounded
- Farvetegning
- Highly variable due to selective breeding, ranging from metallic orange, red, yellow, white, black, and calico patterns. Wild-type goldfish are typically olive-green to brownish-grey.
- Skæltype
- cycloid
- Mundens placering
- terminal
- Kendetegn
- Lack of barbels (distinguishes from common carp), Serrated dorsal and anal fin spines (present in wild forms, less pronounced in some fancy varieties), Highly variable body shapes and fin configurations in domesticated forms.
- Rygfinne
- Single, long-based dorsal fin, often with a serrated spine. Can be short or long depending on variety.
- Halefinne
- Caudal fin can be single (e.g., common, comet) or double/fantail (e.g., fantail, oranda, ryukin). Shapes vary from deeply forked to rounded.
- Brystfinne
- Paired pectoral fins, typically clear or matching body coloration.
- Karakteristiske finner
- Many fancy varieties exhibit highly modified fins, such as long flowing fins (veiltail), or absent dorsal fins (celestial, bubble eye).
Identifikationstips
Coloration
While wild goldfish are drab, domesticated forms are easily identified by their bright, often metallic, orange, red, or yellow hues. Feral populations often revert to a duller, olive-brown color.
Absence of Barbels
Unlike common carp (Cyprinus carpio), goldfish lack barbels around their mouth, which is a key distinguishing feature.
Dorsal Fin Spine
The last unbranched ray of the dorsal fin is typically serrated, a characteristic shared with other Carassius species.
Body Shape and Fin Variety
The immense diversity in body shapes (from slender to egg-shaped) and fin types (single, double, long, short) in domesticated goldfish is unique among freshwater fish.
Habitat
- Vandtype
- freshwater
- Dybde
- Typically found in shallow to moderately deep waters, often near vegetation.
- Miljø
- Native to slow-moving or still waters such as ponds, lakes, rivers, and ditches. Feral populations thrive in similar disturbed aquatic environments globally.
- Geografisk udbredelse
- Originally native to East Asia (China). Now globally distributed due to human introduction, with feral populations established on every continent except Antarctica.
Akvarieoplysninger
- Plejeniveau: beginner
- Temperament: peaceful
- Kost: omnivore
- Minimum akvariestørrelse: 75 gallons (for common/comet varieties, larger for fancy varieties due to waste production)
- Temperatur: 18-24°C (65-75°F)
- pH-niveau: 6.0-8.0
- Hårdhed: 5-19 dGH
- Kompatibilitet: Best kept with other goldfish or peaceful, cold-water tolerant fish. Avoid small, fin-nipping, or aggressive species.
- Særlige krav: Requires excellent filtration due to high waste production. Needs a varied diet including flakes, pellets, and fresh vegetables. Adequate space is crucial for healthy growth and longevity. Avoid overfeeding.
Information om vilde bestande
- Bevaringsstatus: least concern
- Sæson: Breeding typically occurs in spring and early summer when water temperatures rise. Activity levels are reduced in colder months.
- Markedspris: Varies widely depending on variety, size, and rarity (from a few dollars to hundreds).
- Kommerciel betydning: high
- Smag: Mild, somewhat earthy
- Konsistens: Flaky, soft
- Tilberedningsmetoder: Frying, Baking, Steaming
- Næringsværdi: Low in fat, good source of protein. Not commonly consumed in Western cultures, but eaten in some parts of Asia.
Nøglefakta
Long Lifespanamazing
With proper care, goldfish can live for 10-15 years, and some have been recorded to live over 40 years, debunking the myth of their short lifespan.
Memory Mythinteresting
Contrary to popular belief, goldfish have a memory span of several months and can be trained to perform tricks, recognize their owners, and navigate mazes.
Color Changebehavior
Goldfish can change color due to various factors including diet, light exposure, water quality, and stress. They can even lose their color if kept in darkness.
Invasive Speciesinteresting
When released into the wild, goldfish can grow to surprisingly large sizes, outcompete native species for food, and disrupt aquatic ecosystems, becoming an invasive threat.
Ancient Originsevolution
Goldfish were first domesticated in China over a thousand years ago, making them one of the oldest domesticated fish species.
Sikkerhedsoplysninger
Sikker- Sikkerhedsniveau: safe
- Giftig: Nej
- Spiselighed: edible
- Håndteringsnoter: Goldfish are generally harmless. When handling, use wet hands or a fine-mesh net to avoid damaging their protective slime coat and scales. Return to water quickly to minimize stress.
Lignende arter
Prussian Carp
Carassius gibelio
Often considered the wild ancestor. Prussian carp typically have a more silvery-grey coloration, a deeper body, and a more pronounced lateral line. Goldfish (C. auratus) generally have a more rounded body and brighter coloration in their domesticated forms. Hybridization can occur, making differentiation challenging in some cases.
Crucian Carp
Carassius carassius
Crucian carp have a deeper, more compressed body, a convex dorsal fin outline, and typically a bronze or golden-brown coloration. They also lack barbels. Goldfish tend to be more elongated in their wild form and have a straighter dorsal fin outline.
Common Carp
Cyprinus carpio
Common carp are easily distinguished by the presence of two pairs of prominent barbels around their mouth, which goldfish completely lack. Common carp also grow significantly larger and have a more elongated body shape.
Videnskabelig klassifikation
- Rige
- Animalia
- Række
- Chordata
- Klasse
- Actinopterygii
- Orden
- Cypriniformes
- Familie
- Cyprinidae
- Slægt
- Carassius
- Art
- auratus
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