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The Oranda Goldfish is a highly domesticated ornamental variety of the common goldfish (Carassius auratus). It is characterized by a prominent fleshy growth on its head, known as a 'wen' or 'hood', which can cover the entire head except for the eyes and mouth. This wen develops over several months to years, typically becoming fully formed by 2-3 years of age. Orandas are known for their elegant appearance and are a popular choice among aquarists.
Caratteristiche fisiche
- Forma del corpo
- rounded
- Colorazione
- Highly variable, including red, orange, white, black, blue, chocolate, and calico patterns. The most prized variety is the 'Red-cap Oranda', which has a pure white body with a prominent red wen.
- Tipo di squame
- cycloid
- Posizione della bocca
- terminal
- Caratteristiche distintive
- Prominent fleshy growth (wen) on the head, covering the top, sides, and sometimes the cheeks, excluding the eyes and mouth., Large, flowing caudal fin (tail fin) that is often forked or fan-shaped., Deep, rounded body shape.
- Pinna dorsale
- Single, erect, and typically high.
- Pinna caudale
- Double (paired), often long, flowing, and deeply forked or fan-shaped, sometimes resembling a butterfly tail.
- Pinna pettorale
- Paired, typically well-developed.
- Pinne distintive
- All fins are typically paired except for the dorsal fin. The caudal fin is particularly prominent and flowing.
Consigli per l'identificazione
Head Growth (Wen)
The most defining characteristic is the raspberry-like or cauliflower-like fleshy growth on its head. This wen can vary in size and shape, from a small cap to a large mass covering most of the head.
Body Shape
Orandas have a deep, rounded, egg-shaped body, distinct from the more elongated body of common goldfish or comets.
Fin Structure
They possess a single dorsal fin and a characteristic double caudal fin, which is often long and flowing.
Coloration
While highly variable, the presence of a wen combined with typical goldfish colors (red, orange, white, calico) helps distinguish it.
Habitat
- Tipo di acqua
- freshwater
- Profondità
- Not applicable in a wild context; in aquariums, they prefer open swimming space.
- Ambiente
- Primarily an aquarium fish. Its wild ancestor, Carassius auratus, inhabits slow-moving freshwater bodies such as ponds, lakes, and rivers with dense vegetation and muddy bottoms.
- Areale geografico
- Originates from selective breeding in China and Japan. Not found in the wild in its Oranda form. The wild ancestor, Carassius auratus, is native to East Asia.
Informazioni sull'acquario
- Livello di cura: intermediate
- Temperamento: peaceful
- Dieta: omnivore
- Dimensione minima della vasca: 75 gallons (280 liters) for a single adult, with an additional 10-20 gallons per extra fish
- Temperatura: 18-22°C (65-72°F)
- Livello di pH: 6.5-7.5
- Durezza: 5-19 dGH (89-339 ppm)
- Compatibilità: Best kept with other peaceful, slow-moving goldfish varieties that have similar care requirements and do not nip fins or wen. Avoid fast-swimming or aggressive species.
- Requisiti speciali: Requires excellent water quality due to their high bioload. Powerful filtration is essential, along with regular partial water changes (25-50% weekly). The wen can sometimes obstruct vision or make feeding difficult, requiring careful observation. Sharp decorations should be avoided to prevent injury to the wen. Due to their size and bioload, they are not suitable for small bowls or unfiltered tanks.
Informazioni in natura
- Stato di conservazione: least concern
- Stagionalità: Not applicable as it is a domesticated variety primarily bred in captivity.
- Prezzo di mercato: Varies widely based on size, color, wen development, and rarity, from $10 to $100+
- Importanza commerciale: high
- Sapore: Not typically consumed due to their ornamental value and small size compared to food fish.
- Consistenza: Not typically consumed.
- Valore nutrizionale: Not typically consumed.
Fatti chiave
Wen Developmentinteresting
The distinctive head growth, or 'wen', of the Oranda goldfish can take up to 2-3 years to fully develop and can continue to grow throughout the fish's life.
Vision Impairmentbehavior
In some Orandas, the wen can grow so large that it obstructs their vision, making it difficult for them to find food or navigate their environment. Aquarists sometimes need to hand-feed these individuals.
Originevolution
The Oranda goldfish was first developed in China, where it is highly prized for its unique appearance.
Lifespanrecord
With proper care, Oranda goldfish can live for 10-15 years, and sometimes even longer, in a well-maintained aquarium.
Informazioni di sicurezza
Sicuro- Livello di sicurezza: safe
- Velenoso: No
- Commestibilità: not recommended
- Note sul maneggio: Oranda goldfish are delicate due to their wen, which can be easily damaged. Handle with extreme care, preferably using a soft net or by hand if necessary, to avoid injury to the wen or fins. Their eyes can sometimes be obscured by the wen, making them less aware of their surroundings.
Specie simili
Lionhead Goldfish
Carassius auratus auratus
Lionheads also have a prominent wen, but they lack a dorsal fin. The wen on a Lionhead typically covers the head and cheeks more extensively than on some Orandas, but the absence of a dorsal fin is the key differentiator.
Ranchu Goldfish
Carassius auratus auratus
Ranchus are similar to Lionheads in lacking a dorsal fin and having a wen. However, Ranchus have a more arched back and a distinctive short, tucked-under caudal fin, giving them a 'buffalo-back' appearance, whereas Orandas have a dorsal fin and a long, flowing caudal fin.
Fantail Goldfish
Carassius auratus auratus
Fantails have a double caudal fin and a rounded body like Orandas, but they completely lack the head growth (wen) that defines the Oranda.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Actinopterygii
- Ordine
- Cypriniformes
- Famiglia
- Cyprinidae
- Genere
- Carassius
- Specie
- Carassius auratus
Esplora Oranda Goldfish
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