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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 triangular or 'hatchet-shaped' black patch on its posterior flank, which differentiates it from other rasbora species. They are active swimmers and prefer to live in well-planted aquariums, mimicking their natural habitat of slow-moving, acidic blackwater streams.
Caratteristiche fisiche
- Forma del corpo
- compressed
- Colorazione
- The body is typically a coppery-orange to reddish-pink, often with iridescent highlights. The most striking feature is a large, triangular or wedge-shaped black patch 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 di squame
- cycloid
- Posizione della bocca
- terminal
- Caratteristiche distintive
- Prominent black triangular/wedge-shaped patch on the flank, Coppery-orange to reddish-pink body coloration, Small, slender body
- Pinna dorsale
- Single, relatively small, located mid-body.
- Pinna caudale
- Forked, with rounded lobes.
- Pinna pettorale
- Small, clear, positioned ventrally.
- Pinne distintive
- All fins are generally translucent, sometimes with a slight reddish hue, lacking prominent markings other than the body patch.
Consigli per l'identificazione
Black Patch Shape
The most definitive feature is the distinct, triangular or wedge-shaped black patch on the posterior flank. This patch is sharply defined and does not extend into the caudal fin.
Body Coloration
Observe the coppery-orange to reddish-pink body color, which can vary in intensity depending on mood, health, and lighting.
Size
Adults typically reach a maximum standard length of 4-5 cm (1.6-2 inches).
Fin Markings
Note the absence of significant markings on the fins themselves, which are generally clear or slightly tinted.
Habitat
- Tipo di acqua
- freshwater
- Profondità
- 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, and leaf litter, which contribute to the acidic and soft water conditions. The water is often stained dark brown by tannins.
- Areale geografico
- Native to Southeast Asia, specifically Peninsular Malaysia, Singapore, and parts of Thailand. Reports from Sumatra and Borneo are likely misidentifications or introduced populations.
Informazioni sull'acquario
- Livello di cura: beginner
- Temperamento: peaceful
- Dieta: omnivore
- Dimensione minima della vasca: 10 gallons (38 liters)
- Temperatura: 22-27°C (72-81°F)
- Livello di pH: 6.0-7.0
- Durezza: 1-10 dGH
- Compatibilità: Excellent for community tanks with other peaceful, similarly sized fish such as other rasboras, tetras, dwarf gouramis, corydoras, and small plecos. Avoid housing with large or aggressive species that may prey on them.
- Requisiti speciali: Requires a well-planted aquarium with plenty of hiding spots and open swimming areas. Prefers subdued lighting and a dark substrate to enhance coloration. They are schooling fish and should be kept in groups of at least 6-8 individuals to reduce stress and encourage natural behavior. Good water quality with regular partial water changes is essential.
Informazioni in natura
- Stato di conservazione: least concern
- Stagionalità: No specific seasonality for availability in the aquarium trade, as they are widely bred. In the wild, breeding may be influenced by rainy seasons.
- Prezzo di mercato: Low to moderate, widely available
- Importanza commerciale: high
- Sapore: Not typically consumed due to small size
- Consistenza: Not typically consumed due to small size
- Valore nutrizionale: Not typically consumed due to small size
Fatti chiave
Taxonomic Revisionevolution
Originally described as Rasbora heteromorpha, it was reclassified into the genus Trigonostigma in 1999 along with other similar species due to distinct morphological differences, particularly in reproductive strategies and fin structure.
Unique Spawning Behaviorbehavior
Unlike many cyprinids that scatter eggs, Harlequin Rasboras exhibit a unique spawning behavior where the female inverts and attaches her eggs to the underside of broad-leaved plants, with the male fertilizing them simultaneously. This behavior is a key characteristic of the Trigonostigma genus.
Blackwater Specialistinteresting
Their natural habitat in blackwater streams, rich in tannins from decaying vegetation, contributes to their preference for soft, acidic water conditions in aquariums. These conditions also enhance their vibrant coloration.
Schooling Fishbehavior
Harlequin Rasboras are obligate schooling fish, meaning they thrive and exhibit natural behaviors only when kept in groups. A school of 6 or more individuals provides security and reduces stress.
Informazioni di sicurezza
Sicuro- Livello di sicurezza: safe
- Velenoso: No
- Commestibilità: not recommended
- Note sul maneggio: Harlequin Rasboras are small, delicate fish. Handle with care using a fine-mesh net to avoid injury to their fins or scales. They are not known to bite or cause any harm to humans.
Specie simili
Lambchop Rasbora
Trigonostigma espei
The black patch on T. espei is more elongated and 'lambchop' shaped, often with a more reddish body color. The patch typically extends further into the caudal peduncle and can be less sharply defined anteriorly.
Glowlight Rasbora
Trigonostigma hengeli
T. hengeli has a much thinner, more linear black stripe that is often iridescent orange or gold along its upper edge. The body coloration is generally more subdued, often a silvery-orange.
Blackline Rasbora
Rasbora borapetensis
While also having a black stripe, R. borapetensis has a distinct black lateral line that runs the entire length of the body, often with a golden stripe above it. The body shape is generally more elongated and torpedo-like, lacking the deep body of Trigonostigma species.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Actinopterygii
- Ordine
- Cypriniformes
- Famiglia
- Cyprinidae
- Genere
- Trigonostigma
- Specie
- heteromorpha
Esplora Harlequin Rasbora
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