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Gymnocorymbus ternetzi, commonly known as the Black Skirt Tetra, is a popular freshwater fish belonging to the family Characidae. It is characterized by its distinctive black and silver coloration, particularly prominent in its juvenile stage. As it matures, the black coloration tends to fade, especially in the posterior half of the body and fins. This species is known for its schooling behavior and relatively peaceful temperament, making it a favored choice for community aquariums.
Características físicas
- Formato do corpo
- compressed
- Coloração
- Juveniles exhibit a silvery body with three prominent vertical black bars, the first passing through the eye, the second behind the operculum, and the third across the anterior part of the body. The posterior half of the body and the anal fin are typically black. As they mature, the black pigmentation often fades, becoming more grayish, especially in the body, while the anal fin retains a darker hue. Long-finned varieties have elongated dorsal and anal fins.
- Tipo de escama
- cycloid
- Posição da boca
- terminal
- Características distintivas
- Three vertical black bars on a silvery body (more pronounced in juveniles), Large, flowing anal fin, especially in males and long-finned varieties, Deep body shape
- Nadadeira dorsal
- Small, triangular, located mid-body, often with a black tip.
- Nadadeira caudal
- Forked, transparent to slightly dusky.
- Nadadeira peitoral
- Small, clear, located just behind the operculum.
- Nadadeiras características
- Anal fin is notably large and elongated, extending from the ventral region almost to the caudal peduncle, often black or dusky.
Dicas de identificação
Coloration
Look for the characteristic three vertical black bars on a silvery body, especially in younger specimens. The large, often black, anal fin is also a key identifier.
Body Shape
Its deep, laterally compressed body distinguishes it from many other slender tetra species.
Fin Structure
The prominent, elongated anal fin is a defining feature, particularly in mature individuals and males.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Typically found in shallow to moderately deep waters, often near the surface or mid-water column.
- Ambiente
- Native to slow-moving rivers, streams, and tributaries, as well as floodplains and ponds. They prefer areas with dense vegetation, submerged roots, and leaf litter, which provide shelter and foraging opportunities. Water is often clear to blackwater.
- Distribuição geográfica
- Native to the Guapor, Paraguay, and Paran River basins in South America, including parts of Brazil, Bolivia, Argentina, and Paraguay.
Informações sobre aquário
- Nível de cuidado: beginner
- Temperamento: peaceful
- Alimentação: omnivore
- Tamanho mínimo do aquário: 60 liters (15 gallons) for a small school
- Temperatura: 20-26 C (68-79 F)
- Nível de pH: 6.0-7.5
- Dureza da água: 5-19 dGH
- Compatibilidade: Excellent for community tanks with other peaceful, similarly sized fish. Avoid keeping with fin-nipping species or very small, slow-moving fish.
- Requisitos especiais: Requires a well-planted aquarium with open swimming spaces. Best kept in schools of 6 or more individuals to reduce stress and encourage natural behavior. Dim lighting can enhance their coloration.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: Breeds year-round in suitable conditions, with peak activity often coinciding with rainy seasons in their natural habitat.
- Preço de mercado: Low to moderate for common varieties; higher for long-finned or color morphs.
- Importância comercial: high
- Sabor: Not typically consumed due to small size.
- Textura: Not typically consumed due to small size.
- Valor nutricional: Not typically consumed due to small size.
Fatos principais
Color Fadingbehavior
The intense black coloration of juvenile Black Skirt Tetras often fades significantly as they mature, becoming more grayish. This is a natural process and not indicative of poor health.
Long-Finned Varietiesinteresting
Selective breeding has produced popular long-finned varieties, which are often more delicate and prone to fin-nipping by other fish.
Schooling Behaviorbehavior
Black Skirt Tetras are obligate schooling fish. Keeping them in groups of six or more is crucial for their well-being, reducing stress and preventing nipping behavior towards other tank mates.
Albino and Gold Morphsinteresting
In addition to the standard and long-finned varieties, albino and gold color morphs have also been developed through selective breeding for the aquarium trade.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: not recommended
- Observações de manuseio: No specific handling precautions are required beyond standard fish care. They are not venomous and do not possess sharp spines that pose a significant threat. Handle gently to avoid stress or injury to the fish.
Espécies similares
Buenos Aires Tetra
Hyphessobrycon anisitsi
Lacks the distinct vertical black bars and has a more reddish caudal fin base. Generally more active and can be fin-nippers.
Serpae Tetra
Hyphessobrycon eques
Possesses a single, comma-shaped black spot behind the gill plate and typically has red coloration, especially in the fins. Body shape is generally more slender.
Phantom Tetra (Black)
Megalamphodus megalopterus
Has a distinct black humeral spot and a more rounded, less elongated anal fin. Males have a more pronounced dorsal fin.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Characiformes
- Família
- Characidae
- Gênero
- Gymnocorymbus
- Espécie
- ternetzi
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