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Trigonostigma espei, commonly known as the Espei Rasbora or Lambchop Rasbora, is a small, schooling freshwater fish belonging to the family Cyprinidae. It is highly valued in the aquarium trade for its vibrant coloration and peaceful demeanor. This species is characterized by a distinctive, copper-orange body with a prominent, wedge-shaped black marking on its flanks, which gives rise to its 'lambchop' moniker. They are active swimmers and thrive in well-planted aquariums that mimic their natural blackwater habitats.
Ciri-ciri Fizikal
- Bentuk badan
- compressed
- Warna
- The body is predominantly a vibrant copper-orange to reddish-orange, sometimes with a pinkish hue. A distinctive black, wedge-shaped marking (often described as a 'lambchop' or 'hatchet' shape) is present on the posterior half of the body, extending from just behind the dorsal fin base towards the caudal peduncle. The fins are typically hyaline (clear) or faintly tinted with the body color, sometimes with a reddish margin on the caudal fin.
- Jenis sisik
- cycloid
- Kedudukan mulut
- superior
- Ciri tersendiri
- Vibrant copper-orange body coloration, Prominent black, wedge-shaped marking on the flanks, Small adult size, typically 2.5-3.0 cm (1.0-1.2 inches) standard length
- Sirip dorsal
- Single, relatively short-based, located mid-body.
- Sirip ekor
- Forked, with rounded lobes.
- Sirip pektoral
- Small and clear, positioned ventrally.
- Sirip tersendiri
- All fins are generally clear or subtly colored, lacking prominent markings other than the body's main pattern.
Petua Pengenalan
Body Coloration
Look for the distinct copper-orange to reddish-orange body color, which is brighter and more intense than in many other Trigonostigma species.
Black Mark Shape
The black marking is a clear, well-defined wedge or 'lambchop' shape, starting broadly near the dorsal fin and tapering towards the caudal peduncle. It does not extend significantly into the caudal fin base or anteriorly beyond the dorsal fin origin.
Size
Adults are typically smaller than Trigonostigma heteromorpha, reaching a maximum of about 3 cm (1.2 inches).
Habitat Preference (if observed in wild)
Often found in highly acidic, tannin-stained blackwater environments.
Habitat
- Jenis air
- freshwater
- Kedalaman
- Typically found in shallow, slow-moving waters.
- Persekitaran
- Blackwater streams, peat swamps, and forest streams with dense vegetation, leaf litter, and submerged roots. The water is often stained dark with tannins from decaying organic matter, and is typically soft and acidic.
- Julat geografi
- Native to Southeast Asia, specifically found in parts of Thailand (e.g., southeastern Thailand, including the island of Ko Chang) and Cambodia. Reports from other regions like Malaysia and Sumatra are often misidentifications of similar species.
Maklumat Akuarium
- Tahap penjagaan: beginner
- Perangai: peaceful
- Diet: omnivore
- Saiz tangki minimum: 10 gallons (38 liters)
- 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 that may prey on them.
- Keperluan khas: Requires a well-planted aquarium with subdued lighting and dark substrate to bring out their best coloration. They are schooling fish and should be kept in groups of at least 6-10 individuals to reduce stress and encourage natural behavior. A tight-fitting lid is recommended as they can jump.
Maklumat Liar
- Status pemuliharaan: least concern
- Musim: Breeds year-round in suitable conditions, with peak activity often coinciding with rainy seasons in their natural habitat.
- Harga pasaran: Low to moderate for individual fish, higher for larger groups.
- 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
Taxonomic Historyevolution
Originally described as Rasbora espei by Meinken in 1967, it was later reclassified into the genus Trigonostigma due to distinct morphological features, particularly the unique shape of the black body marking and reproductive strategies.
Breeding Behaviorbehavior
Espei Rasboras are egg scatterers that typically lay their eggs on the underside of broad-leaved plants. The male will often 'dance' around the female, guiding her to a suitable spawning site. They do not exhibit parental care.
Blackwater Specialistinteresting
Their natural habitat in blackwater streams, characterized by low pH and high tannin content, is crucial for their well-being. Replicating these conditions in an aquarium helps to reduce stress and enhance their vibrant coloration.
Schooling Dynamicsbehavior
When kept in a sufficiently large group (10+ individuals), Espei Rasboras display fascinating schooling behaviors, moving in synchronized patterns, which is both a defense mechanism and a social interaction.
Maklumat keselamatan
Selamat- Tahap keselamatan: safe
- Berbisa: Tidak
- Kebolehmakanan: not recommended
- Nota pengendalian: No specific handling precautions are required beyond standard fish care. They are small and delicate, so handle gently with a fine-mesh net if transfer is necessary.
Spesies serupa
Harlequin Rasbora
Trigonostigma heteromorpha
T. heteromorpha is generally larger (up to 4.5 cm) and has a more triangular black marking that extends further anteriorly, often reaching the mid-body and sometimes having a bluish sheen. Its body coloration is typically less intensely copper-orange and more pinkish-silver.
Glowlight Rasbora
Trigonostigma hengeli
T. hengeli is similar in size to T. espei but has a less defined, often iridescent orange or gold stripe above the black wedge. The black wedge itself is usually thinner and less intensely black, sometimes appearing more like a dark line or streak, and the body color is generally paler.
Blackline Rasbora
Trigonostigma somphongsi
T. somphongsi is much smaller (up to 2 cm) and has a very thin, straight black line running along its flank, rather than a wedge-shaped marking. Its body coloration is also typically paler.
Klasifikasi saintifik
- Kerajaan
- Animalia
- Filum
- Chordata
- Kelas
- Actinopterygii
- Ordo
- Cypriniformes
- Keluarga
- Cyprinidae
- Genus
- Trigonostigma
- Spesies
- espei
Terokai Espei Rasbora
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