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Trigonostigma hengeli, commonly known as the Hengeli Rasbora or Glowlight Rasbora, is a small, schooling cyprinid fish native to Southeast Asia. It is characterized by its slender body, coppery-orange coloration, and a distinctive black, wedge-shaped marking on its flanks, often outlined in iridescent orange or gold. This species is highly valued in the aquarium trade for its peaceful nature, vibrant colors, and active schooling behavior.
Ciri-ciri Fizikal
- Bentuk badan
- elongated
- Warna
- The body is generally translucent, with a coppery-orange to pinkish-orange hue, particularly along the dorsal surface and fins. A prominent black, wedge-shaped marking (often referred to as a 'harlequin patch') is present on the posterior half of the body, extending from just behind the pectoral fin base to the caudal peduncle. This black mark is typically bordered dorsally and ventrally by a bright, iridescent orange or gold stripe, which gives the fish its 'glowlight' appearance. The fins are largely hyaline (clear) with a slight orange tint.
- Jenis sisik
- cycloid
- Kedudukan mulut
- terminal
- Ciri tersendiri
- Small size, typically reaching 2.5-3.0 cm (1.0-1.2 inches) standard length., Slender, somewhat compressed body., Distinctive black wedge-shaped marking on the flank, often outlined in iridescent orange/gold., Coppery-orange body coloration.
- Sirip dorsal
- Single, relatively small dorsal fin, typically with 2 unbranched and 7 branched rays. Originates slightly posterior to the pelvic fin origin.
- Sirip ekor
- Forked caudal fin, with symmetrical lobes.
- Sirip pektoral
- Small, clear pectoral fins, typically with 1 unbranched and 10-11 branched rays.
- Sirip tersendiri
- Pelvic fins are small, located abdominally, with 1 unbranched and 7 branched rays. Anal fin is relatively short, with 2 unbranched and 5 branched rays.
Petua Pengenalan
Size and Body Shape
Look for a small, slender fish, typically not exceeding 3 cm (1.2 inches) in length.
Coloration
Observe the overall coppery-orange body color, especially the iridescent orange/gold stripe bordering the black wedge.
Black Wedge Mark
The most defining feature is the distinct black, wedge-shaped marking on the posterior half of the body. In T. hengeli, this wedge is typically more elongated and less triangular than in T. heteromorpha, and often has a more pronounced iridescent border.
Eye Color
Often, the upper part of the iris has a reddish or orange tint.
Habitat
- Jenis air
- freshwater
- Kedalaman
- Typically found in shallow, slow-moving waters.
- Persekitaran
- Inhabits blackwater streams, peat swamps, and forest streams with dense vegetation, often under a canopy of trees. The water is usually soft, acidic, and stained with tannins from decaying organic matter, giving it a tea-like color. Substrates are typically sand or leaf litter.
- Julat geografi
- Native to Southeast Asia, specifically Sumatra (Indonesia) and parts of the Malay Peninsula (Malaysia and possibly southern Thailand).
Maklumat Akuarium
- Tahap penjagaan: beginner
- Perangai: peaceful
- Diet: omnivore
- Saiz tangki minimum: 10 gallons (38 liters) for a small school
- Suhu: 23-28°C (73-82°F)
- Tahap pH: 5.0-7.0
- Kekerasan air: 1-10 dGH
- Keserasian: Excellent for community tanks with other small, peaceful fish such as other rasboras, tetras, dwarf gouramis, corydoras, and small Loricariids. Avoid housing with large or aggressive species.
- Keperluan khas: Requires a well-planted aquarium with subdued lighting and plenty of open swimming space. Prefers soft, acidic water conditions. Best kept in schools of 8 or more individuals to exhibit natural schooling behavior and reduce stress.
Maklumat Liar
- Status pemuliharaan: least concern
- Musim: No specific seasonal behavior patterns are noted for wild populations that would impact availability, as they are typically found year-round in their natural habitats.
- Harga pasaran: Low to moderate, depending on region and supplier.
- Kepentingan komersial: medium
- Rasa: Not typically consumed due to small size.
- Tekstur: Not typically consumed due to small size.
- Nilai pemakanan: Not typically consumed due to small size.
Fakta utama
Schooling Behaviorbehavior
Hengeli Rasboras are obligate schooling fish, meaning they thrive and exhibit their most natural behaviors when kept in groups of at least 8-10 individuals. This schooling provides security and reduces stress.
Blackwater Specialistinteresting
This species naturally inhabits blackwater environments, characterized by soft, acidic water stained with tannins from decaying organic matter. Replicating these conditions in an aquarium is beneficial for their health and coloration.
Sexual Dimorphismbehavior
While subtle, adult females are typically rounder and fuller-bodied than males, especially when gravid. Males may exhibit slightly more intense coloration during spawning.
Taxonomic Historyevolution
Originally described as Rasbora hengeli, it was later reclassified into the genus Trigonostigma along with other 'harlequin-type' rasboras due to distinct morphological differences, particularly in their reproductive strategies and body shape.
Maklumat keselamatan
Selamat- Tahap keselamatan: safe
- Berbisa: Tidak
- Kebolehmakanan: not recommended
- Nota pengendalian: No specific handling precautions are required beyond general care for small, delicate fish. Avoid sudden movements or loud noises when near the aquarium to prevent startling them. They are not known to bite or possess any harmful spines.
Spesies serupa
Harlequin Rasbora
Trigonostigma heteromorpha
T. heteromorpha is generally larger (up to 4.5 cm) and has a more triangular, less elongated black wedge marking. The iridescent border around the wedge is typically less pronounced or absent compared to T. hengeli. The body coloration of T. heteromorpha is often more reddish-orange.
Lambchop Rasbora
Trigonostigma espei
T. espei is similar in size to T. hengeli but has a more reddish-orange body color and a black wedge marking that is more 'lambchop' or 'axe-head' shaped, often with a more defined, sharper anterior point. The iridescent border is usually less prominent than in T. hengeli.
Blackline Rasbora
Trigonostigma somphongsi
T. somphongsi is a much rarer and smaller species. Its black marking is typically a thin, horizontal line rather than a wedge, and it lacks the prominent iridescent orange border seen in T. hengeli.
Klasifikasi saintifik
- Kerajaan
- Animalia
- Filum
- Chordata
- Kelas
- Actinopterygii
- Ordo
- Cypriniformes
- Keluarga
- Cyprinidae
- Genus
- Trigonostigma
- Spesies
- Trigonostigma hengeli
Terokai Hengeli Rasbora
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