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Hemigrammus rodwayi, commonly known as the Goldtetra or Golden Tetra, is a small, schooling freshwater fish belonging to the family Characidae. It is characterized by its iridescent golden sheen, which can vary in intensity depending on lighting, diet, and mood. This species is a popular aquarium fish due to its peaceful nature and attractive appearance. In its natural habitat, it plays a role in the food web as both a consumer of small invertebrates and plant matter, and as prey for larger fish.
Körperliche Merkmale
- Körperform
- compressed
- Färbung
- The body is generally silvery-gold to a distinct golden-yellow, often with an iridescent sheen that reflects light. A faint, sometimes indistinct, dark lateral line may be present, extending from behind the operculum to the caudal peduncle. The fins are typically hyaline (clear) to slightly yellowish, with no prominent markings. The intensity of the golden coloration can vary significantly based on environmental conditions, diet, and the fish's health and mood.
- Schuppentyp
- cycloid
- Maulstellung
- terminal
- Besondere Merkmale
- Iridescent golden body coloration, Small adipose fin, Absence of a distinct humeral spot or caudal spot, which differentiates it from many other Hemigrammus species.
- Rückenflosse
- Single, relatively small, located mid-body.
- Schwanzflosse
- Forked, symmetrical.
- Brustflosse
- Paired, small, located just behind the operculum.
- Auffällige Flossen
- Presence of a small, fleshy adipose fin between the dorsal and caudal fins, characteristic of characins.
Bestimmungstipps
Body Coloration
Look for the characteristic iridescent golden sheen over a silvery-yellow body. This is the most defining feature.
Absence of Spots
Unlike many other tetras, the Goldtetra typically lacks a prominent dark humeral spot (behind the gill cover) or a distinct black spot on the caudal peduncle.
Fin Coloration
Fins are generally clear or slightly yellowish, without strong pigmentation or patterns.
Size
Adults typically reach a maximum standard length of 4-5 cm (1.6-2.0 inches).
Lebensraum
- Wassertyp
- freshwater
- Tiefe
- Typically found in shallow to moderately deep waters, often near the surface or mid-water column.
- Umgebung
- Inhabits slow-moving rivers, streams, tributaries, and flooded forest areas. Prefers areas with dense aquatic vegetation, submerged roots, and leaf litter, which provide cover and foraging opportunities. Water is often clear to blackwater, with soft, acidic conditions.
- Geografische Verbreitung
- Native to South America, specifically the Amazon River basin. Its distribution includes Guyana, Suriname, French Guiana, and parts of Brazil (e.g., the Rio Negro basin).
Aquarieninformationen
- Pflegeaufwand: beginner
- Temperament: peaceful
- Ernährung: omnivore
- Mindestbeckengröße: 20 gallons (75 liters)
- Temperatur: 22-28°C (72-82°F)
- pH-Wert: 5.5-7.5
- Härte: 2-15 dGH
- Verträglichkeit: Excellent with other peaceful community fish of similar size, such as other tetras, rasboras, corydoras, and small peaceful cichlids. Best kept in schools of 6 or more individuals to reduce stress and encourage natural schooling behavior.
- Besondere Anforderungen: Requires a well-planted aquarium with open swimming spaces. Subdued lighting and a dark substrate can enhance their coloration. Good water quality with regular partial water changes is essential. Provide hiding spots among plants or driftwood.
Informationen zum Wildbestand
- Erhaltungszustand: least concern
- Saisonalität: No specific seasonal behavior patterns are noted for this species in terms of availability or breeding in the wild, as they are continuously present in their habitats.
- Marktpreis: Low to moderate (typically $2-$5 per fish in the aquarium trade)
- Kommerzielle Bedeutung: medium
- Geschmack: Not typically consumed due to small size.
- Textur: Not typically consumed due to small size.
- Nährwert: Not typically consumed due to small size.
Wichtige Fakten
Golden Glowamazing
The Goldtetra's iridescent golden sheen is not due to pigments but rather to guanine crystals in specialized cells (iridophores) that reflect light, creating its characteristic metallic luster.
Schooling Behaviorbehavior
Hemigrammus rodwayi is a highly social species that thrives in large schools. Keeping them in groups of six or more not only reduces stress but also enhances their natural behaviors and displays of coloration.
Habitat Mimicryinteresting
In aquariums, providing a dark substrate and dense planting can help mimic their natural blackwater or tannin-stained habitats, which often intensifies their golden coloration.
Dietary Flexibilitybehavior
While primarily omnivorous, Goldtetras show a preference for small invertebrates in the wild, supplementing their diet with plant matter and detritus. This adaptability makes them easy to feed in captivity.
Sicherheitsinformationen
Sicher- Sicherheitsstufe: safe
- Giftig: Nein
- Essbarkeit: not recommended
- Hinweise zum Umgang: No specific handling precautions are required beyond standard fish handling practices to minimize stress and injury to the fish. They are not venomous and do not possess sharp spines that pose a significant threat.
Ähnliche Arten
Neon Tetra
Paracheirodon innesi
Neon Tetras have a prominent iridescent blue-green stripe and a red stripe along the lower half of the body, which are absent in Goldtetras. Neon Tetras also tend to be slightly smaller.
Cardinal Tetra
Paracheirodon axelrodi
Cardinal Tetras have a full red stripe extending from the snout to the caudal fin, and a more intense iridescent blue stripe, both of which are absent in Goldtetras.
Glowlight Tetra
Hemigrammus erythrozonus
Glowlight Tetras possess a distinct, bright orange-red stripe running horizontally along the body, which is not present in Goldtetras. Their body coloration is also more silvery than golden.
Black Neon Tetra
Hyphessobrycon herbertaxelrodi
Black Neon Tetras have two distinct horizontal stripes: a bright iridescent white/gold stripe above a solid black stripe. Goldtetras lack these prominent stripes.
Wissenschaftliche Klassifikation
- Reich
- Animalia
- Stamm
- Chordata
- Klasse
- Actinopterygii
- Ordnung
- Characiformes
- Familie
- Characidae
- Gattung
- Hemigrammus
- Art
- rodwayi
Goldtetra entdecken
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