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Lepidarchus adonis, commonly known as the Piauçu or Adonis Tetra, is a minute characin belonging to the family Characidae. It is notable for its exceptionally small size, making it one of the smallest fish species in the world. This species exhibits a delicate and translucent appearance, often with subtle iridescence. Its morphology is adapted for life in slow-moving, densely vegetated aquatic environments.
Características físicas
- Formato do corpo
- elongated
- Coloração
- Generally translucent to pale yellowish-brown, often with a faint, iridescent lateral stripe. Fins are typically hyaline (clear). Some individuals may exhibit a reddish or orange tint, particularly males during breeding.
- Tipo de escama
- cycloid
- Posição da boca
- terminal
- Características distintivas
- Extremely small adult size (typically less than 2 cm TL), Absence of an adipose fin (a key distinguishing feature among characins), Delicate, almost ghost-like appearance, Sexual dimorphism: males are often more slender and may display more intense coloration during courtship.
- Nadadeira dorsal
- Small, typically with 2 unbranched and 7-8 branched rays, positioned relatively far back on the body.
- Nadadeira caudal
- Forked, with symmetrical lobes.
- Nadadeira peitoral
- Small and transparent.
- Nadadeiras características
- Pelvic fins are very small or absent in some individuals, and the adipose fin is entirely absent, which is unusual for characins.
Dicas de identificação
Size
Its exceptionally small adult size (rarely exceeding 2 cm total length) is the primary identifier. If it's larger than 2.5 cm, it's likely not Lepidarchus adonis.
Adipose Fin
The complete absence of an adipose fin is a crucial diagnostic character that differentiates it from most other characins.
Body Coloration and Transparency
Its translucent body and subtle coloration, often with a faint lateral line, are characteristic. It lacks prominent patterns or bold colors seen in many other small tetras.
Fin Structure
The small, hyaline fins and the relatively posterior placement of the dorsal fin are also helpful identification points.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Shallow, typically in the upper water column near vegetation.
- Ambiente
- Slow-moving, heavily vegetated blackwater or clearwater streams, swamps, and forest pools. Prefers areas with dense aquatic plants, submerged roots, and leaf litter, providing cover and a rich microfauna food source. Water is often soft and acidic.
- Distribuição geográfica
- West Africa, specifically known from coastal drainages in Ghana (e.g., Ankobra River basin) and possibly other adjacent regions.
Informações sobre aquário
- Nível de cuidado: advanced
- Temperamento: peaceful
- Alimentação: omnivore
- Tamanho mínimo do aquário: 10 gallons (38 liters)
- Temperatura: 22-26 °C (72-79 °F)
- Nível de pH: 5.0-6.5
- Dureza da água: 1-5 dGH
- Compatibilidade: Best kept in species-specific tanks or with other very small, peaceful, and similarly sized characins or micro-rasboras. Avoid larger or boisterous tank mates.
- Requisitos especiais: Requires a heavily planted aquarium with fine-leaved plants, floating vegetation, and subdued lighting to mimic its natural habitat. A dark substrate and leaf litter (e.g., Indian almond leaves) are beneficial for maintaining appropriate water chemistry and providing hiding spots. Excellent water quality with gentle filtration is paramount due to its small size and delicate nature. Live foods (e.g., microworms, infusoria, newly hatched brine shrimp) are essential for conditioning and breeding.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: Reproduction is likely tied to rainy seasons, but specific seasonal behavior patterns are not extensively documented for this species in the wild.
- Preço de mercado: Moderate to high (due to rarity and specialized care)
- Importância comercial: low
- Sabor: Not applicable due to minute size.
- Textura: Not applicable due to minute size.
- Valor nutricional: Not applicable due to minute size.
Fatos principais
Smallest Characinrecord
Lepidarchus adonis is considered one of the smallest, if not the smallest, species within the diverse Characidae family.
Adipose Fin Absenceinteresting
Unlike most characins, L. adonis completely lacks an adipose fin, a small fleshy fin typically found between the dorsal and caudal fins.
Specialized Habitatbehavior
This species thrives in very specific blackwater or clearwater environments with dense vegetation, indicating a high degree of habitat specialization.
Aquarium Challengeinteresting
Due to its minute size and specific environmental requirements, the Piauçu is considered an advanced species for aquarists, requiring meticulous care.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: not recommended
- Observações de manuseio: Due to their extremely small and delicate nature, Piauçu should be handled with extreme care, preferably by experienced aquarists. Minimize direct contact and use a fine-meshed net if transfer is necessary to prevent injury.
Espécies similares
Neon Tetra
Paracheirodon innesi
Significantly larger (up to 4 cm TL), possesses a prominent adipose fin, and has a distinct iridescent blue and red lateral stripe.
Ember Tetra
Hyphessobrycon amandae
Larger (up to 2 cm TL, but more robust), possesses an adipose fin, and exhibits a vibrant orange-red body coloration.
Boraras brigittae
Boraras brigittae
Belongs to the family Cyprinidae (not Characidae), lacks an adipose fin (like L. adonis), but has a distinct dark lateral stripe with an orange blotch, and different fin ray counts.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Characiformes
- Família
- Characidae
- Gênero
- Lepidarchus
- Espécie
- Lepidarchus adonis
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