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Trigonostigma heteromorpha, commonly known as the Harlequin Rasbora, is a small, schooling freshwater fish belonging to the family Cyprinidae. It is highly prized in the aquarium trade for its vibrant coloration and peaceful demeanor. The species is characterized by a distinctive black, triangular patch on its posterior flank, which gives it its common name. These fish are active swimmers and thrive in well-planted aquariums, mimicking their natural habitat of slow-moving, acidic blackwater streams.
Características físicas
- Formato do corpo
- compressed
- Coloração
- The body is typically a coppery-orange to reddish-pink, often with iridescent highlights. The most striking feature is a large, wedge-shaped black patch (often described as a 'harlequin' or 'lambchop' mark) on the posterior half of the body, extending from below the dorsal fin to the caudal peduncle. The fins are generally translucent, sometimes with a reddish tint.
- Tipo de escama
- cycloid
- Posição da boca
- terminal
- Características distintivas
- Prominent black, triangular/wedge-shaped patch on the posterior flank., Coppery-orange to reddish-pink body coloration., Relatively deep body for a small cyprinid.
- Nadadeira dorsal
- Single, relatively short-based dorsal fin, positioned mid-body.
- Nadadeira caudal
- Forked caudal fin.
- Nadadeira peitoral
- Paired pectoral fins, typically clear.
- Nadadeiras características
- All fins are generally clear to slightly reddish, lacking prominent markings other than the body patch.
Dicas de identificação
Black Mark
The most definitive feature is the large, black, triangular or wedge-shaped mark on the side of the body. This mark is unique in its shape and position compared to similar species.
Body Coloration
The coppery-orange to reddish-pink body color, often with a metallic sheen, is characteristic. This can vary slightly depending on water parameters, diet, and stress levels.
Body Shape
Its relatively deep and compressed body, compared to the more slender forms of some other rasboras, is a good indicator.
Size
Adults typically reach a maximum standard length of 3.5-4.5 cm (1.4-1.8 inches).
Habitat
- Tipo de água
- freshwater
- Profundidade
- Typically found in shallow waters, often near the surface or mid-water column.
- Ambiente
- Slow-moving blackwater streams, peat swamps, and forest streams. These environments are characterized by dense vegetation, submerged roots, leaf litter, and soft, acidic water with low mineral content. The water is often stained dark brown by tannins from decaying organic matter.
- Distribuição geográfica
- Native to Southeast Asia, specifically Peninsular Malaysia, Singapore, and parts of Sumatra and southern Thailand. Records from Borneo are now generally attributed to other closely related species within the genus Trigonostigma.
Informações sobre aquário
- Nível de cuidado: beginner
- Temperamento: peaceful
- Alimentação: omnivore
- Tamanho mínimo do aquário: 38 liters (10 gallons) for a small school
- Temperatura: 22-27°C (72-81°F)
- Nível de pH: 5.0-7.0
- Dureza da água: 1-10 dGH
- Compatibilidade: Excellent for community tanks with other peaceful, small to medium-sized fish such as other rasboras, tetras, dwarf gouramis, corydoras, and small plecos. Avoid housing with large or aggressive species.
- Requisitos especiais: Requires a well-planted aquarium with subdued lighting and plenty of hiding spots. Prefers soft, acidic water conditions. Best kept in schools of 6 or more individuals to reduce stress and encourage natural schooling behavior. A dark substrate and floating plants can enhance their coloration and provide a sense of security.
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, typically $2-$5 per fish in the aquarium trade.
- 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
Taxonomic Revisionevolution
The genus Trigonostigma was separated from Rasbora in 1999 by Kottelat and Lim, based on morphological differences, particularly the unique reproductive strategy of laying eggs on the underside of plant leaves.
Unique Spawning Behaviorbehavior
Unlike many other cyprinids that scatter eggs, Harlequin Rasboras are 'egg placers.' The female inverts and presses her belly against the underside of a broad-leaved plant, while the male fertilizes the eggs as they are laid and adhere to the leaf.
Blackwater Specialistbehavior
Their natural habitat is characterized by very soft, acidic 'blackwater' conditions, stained by tannins from decaying organic matter. This environment is crucial for their well-being and breeding success.
Schooling Fishbehavior
Harlequin Rasboras are obligate schooling fish, meaning they feel most secure and exhibit natural behaviors when kept in groups of at least 6-10 individuals. This also enhances their visual appeal in an aquarium.
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 small and delicate, so handle gently with a fine-mesh net if necessary. They are not known to bite or cause any harm.
Espécies similares
Lambchop Rasbora
Trigonostigma espei
T. espei has a more elongated body and a black mark that is more 'lambchop' or 'hockey stick' shaped, often with a more defined anterior point, and typically a more intense red-orange body color. The black mark in T. heteromorpha is generally broader and more triangular.
Glowlight Rasbora
Trigonostigma hengeli
T. hengeli is smaller and more slender than T. heteromorpha. Its black mark is much thinner and more linear, often appearing as a black line with an iridescent orange stripe above it, rather than a broad triangle.
Blackline Rasbora
Trigonostigma somphongsi
T. somphongsi is a much smaller and more delicate species. Its black mark is a very thin, almost pencil-like line, and it lacks the robust body and prominent triangular patch of T. heteromorpha.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Cypriniformes
- Família
- Cyprinidae
- Gênero
- Trigonostigma
- Espécie
- heteromorpha
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