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Nannostomus marginatus, commonly known as the Dwarf Pencilfish, is a small, slender characin belonging to the family Lebiasinidae. It is highly prized in the aquarium hobby for its vibrant coloration, peaceful demeanor, and schooling behavior. This species exhibits a distinctive horizontal stripe pattern, which is characteristic of the Nannostomus genus, but with unique variations that differentiate it from its congeners. They are micro-predators, feeding primarily on small invertebrates in their natural habitat.
Características físicas
- Formato do corpo
- elongated
- Coloração
- The body is typically a light brown to golden-yellow base color. A prominent, broad, dark brown to black lateral stripe runs from the snout through the eye to the caudal peduncle. Above this, a thinner, often reddish or golden stripe is present. The belly is usually whitish. Fins are generally hyaline (clear) but can show hints of red or orange, especially in males. Males tend to be more intensely colored and slender than females.
- Tipo de escama
- cycloid
- Posição da boca
- superior
- Características distintivas
- Three distinct horizontal stripes: a broad dark lateral stripe, a thinner lighter stripe above it, and a faint stripe along the dorsal midline., Small size, typically reaching only 2.5-3.5 cm (1-1.4 inches) in total length., Pointed snout and small, upturned mouth.
- Nadadeira dorsal
- Small, located mid-body, often with a reddish or orange spot.
- Nadadeira caudal
- Forked, with the upper and lower lobes sometimes showing reddish coloration.
- Nadadeira peitoral
- Small and transparent, positioned low on the body.
- Nadadeiras características
- Adipose fin is absent, a characteristic of the Lebiasinidae family. All fins are relatively small and delicate.
Dicas de identificação
Size and Shape
Look for a very small, slender, torpedo-shaped fish, typically under 3.5 cm (1.4 inches) in length.
Stripe Pattern
Identify the three distinct horizontal stripes: a prominent broad dark stripe along the flank, a thinner lighter stripe above it, and a faint dorsal stripe. This pattern is key to distinguishing it from other Nannostomus species.
Mouth Position
Observe the small, upturned mouth, indicative of its surface-feeding habits.
Fin Coloration
Note any reddish or orange coloration in the fins, particularly the dorsal and caudal fins, which is more pronounced in males.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Typically found in shallow, slow-moving waters near the surface.
- Ambiente
- Inhabits blackwater and clearwater streams, rivers, and flooded forest areas. They prefer areas with dense aquatic vegetation, submerged roots, and leaf litter, which provide cover and foraging grounds. The water is often stained with tannins from decaying organic matter, resulting in soft, acidic conditions.
- Distribuição geográfica
- Native to South America, specifically found in the Amazon River basin, including tributaries in Guyana, Suriname, French Guiana, and parts of Brazil (e.g., Rio Negro basin).
Informações sobre aquário
- Nível de cuidado: intermediate
- Temperamento: peaceful
- Alimentação: omnivore
- Tamanho mínimo do aquário: 38 liters (10 gallons)
- Temperatura: 22-28°C (72-82°F)
- Nível de pH: 5.5-7.5
- Dureza da água: 1-10 dGH
- Compatibilidade: Excellent for community tanks with other small, peaceful fish such as other Nannostomus species, small tetras, rasboras, corydoras, and dwarf cichlids. Avoid housing with large or aggressive fish that may prey on them.
- Requisitos especiais: Requires a well-planted aquarium with plenty of hiding spots and subdued lighting. A dark substrate and floating plants can enhance their coloration and reduce stress. They thrive in soft, acidic water conditions and prefer a gentle current. Keeping them in a school of at least 6-10 individuals is crucial for their well-being and to observe their natural schooling behavior.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: No specific seasonal patterns for availability in the aquarium trade, as they are often captive-bred or collected year-round from their natural habitats.
- Preço de mercado: Low to moderate, depending on region and availability.
- Importância comercial: medium
- Sabor: Not typically consumed due to their small size.
- Textura: Not typically consumed due to their small size.
- Valor nutricional: Not typically consumed due to their small size.
Fatos principais
Tiny Terror of the Surfacebehavior
Despite their peaceful nature, Dwarf Pencilfish are efficient micro-predators, constantly scanning the water surface for tiny insects and larvae.
Sleep Posturebehavior
Like many Nannostomus species, Dwarf Pencilfish often adopt a head-down or head-up oblique posture when resting or sleeping, blending in with aquatic vegetation.
Color Changebehavior
Their coloration can intensify or fade depending on their mood, stress levels, and time of day, often becoming more vibrant during breeding or when feeling secure.
Etymologyinteresting
The genus name 'Nannostomus' comes from the Greek 'nannos' (small) and 'stoma' (mouth), referring to their small mouth. 'Marginatus' is Latin for 'margined' or 'bordered', likely referring to their distinct stripe patterns.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: not recommended
- Observações de manuseio: No specific handling precautions are required beyond general care for small, delicate fish. Avoid sudden movements or loud noises around their aquarium as they can be easily startled. When transferring, use a soft net to prevent injury to their delicate fins and scales.
Espécies similares
Coral Red Pencilfish
Nannostomus mortenthaleri
N. mortenthaleri has a more intense red coloration, especially in males, and typically features two prominent dark lateral stripes with a bright red stripe in between, rather than the three-stripe pattern of N. marginatus.
Three-lined Pencilfish
Nannostomus trifasciatus
N. trifasciatus is generally larger and has three very distinct, equally prominent dark lateral stripes, often with red or orange coloration between them, and a more robust body shape compared to the delicate N. marginatus.
One-lined Pencilfish
Nannostomus unifasciatus
N. unifasciatus has only one prominent dark lateral stripe and a more elongated, almost needle-like body shape, often swimming at a distinct head-up angle, unlike N. marginatus.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Characiformes
- Família
- Lebiasinidae
- Gênero
- Nannostomus
- Espécie
- Nannostomus marginatus
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