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Kryptopterus vitreolus, commonly known as the Glass Catfish, is a fascinating freshwater fish renowned for its almost completely transparent body, allowing visibility of its internal organs and skeletal structure. This transparency serves as a form of camouflage in its natural habitat. It is a schooling fish, exhibiting social behavior and preferring to live in groups. Historically, it was often misidentified as Kryptopterus bicirrhis, but recent taxonomic revisions have established K. vitreolus as a distinct species, primarily distinguished by morphological differences and geographic distribution.
Caratteristiche fisiche
- Forma del corpo
- elongated
- Colorazione
- Almost entirely transparent, revealing the spine, swim bladder, and other internal organs. A faint iridescent sheen may be visible under certain lighting conditions. The only opaque parts are the head, a small area around the internal organs, and the caudal fin.
- Tipo di squame
- none
- Posizione della bocca
- superior
- Caratteristiche distintive
- Extreme body transparency, Two long barbels extending from the upper jaw, Absence of a dorsal fin, Small, almost invisible anal fin extending along most of the ventral side
- Pinna dorsale
- Absent (or vestigial, represented by a tiny spine in some individuals, but functionally absent).
- Pinna caudale
- Deeply forked, transparent.
- Pinna pettorale
- Small, transparent, located just behind the operculum.
- Pinne distintive
- The anal fin is remarkably long, extending from just behind the pectoral fins to the caudal peduncle, comprising 55-68 rays. Pelvic fins are very small or absent.
Consigli per l'identificazione
Transparency
The most striking feature is its glass-like body, allowing internal organs and skeletal structure to be clearly seen. This distinguishes it from most other freshwater fish.
Dorsal Fin Absence
Unlike many catfish species, Kryptopterus vitreolus lacks a prominent dorsal fin. This is a key diagnostic feature.
Barbels
Possesses two long, delicate barbels extending from the upper jaw, used for sensing food in its environment.
Schooling Behavior
Always found in tight schools, often hovering in the water column. Solitary individuals are stressed and unhealthy.
Habitat
- Tipo di acqua
- freshwater
- Profondità
- Typically found in shallow to moderate depths, often near the surface or mid-water column.
- Ambiente
- Slow-moving to moderately flowing rivers, streams, and flooded forests. Prefers areas with dense vegetation, submerged roots, and leaf litter, providing cover and a source of micro-invertebrates. Often found in clear to slightly turbid waters.
- Areale geografico
- Native to Southeast Asia, specifically the Chao Phraya and Mekong river basins, and potentially other river systems in Thailand, Cambodia, Laos, and Vietnam. Its distribution was previously confused with K. bicirrhis, which is found further west.
Informazioni sull'acquario
- Livello di cura: intermediate
- Temperamento: peaceful
- Dieta: carnivore
- Dimensione minima della vasca: 30 gallons (114 liters)
- Temperatura: 20-26°C (68-79°F)
- Livello di pH: 6.0-7.0
- Durezza: 2-10 dGH
- Compatibilità: Excellent with other peaceful, similarly sized community fish. Avoid aggressive or fin-nipping species. Best kept in schools of 6 or more individuals.
- Requisiti speciali: Requires a well-established aquarium with stable water parameters. Prefers subdued lighting, dense planting, and open swimming areas. Sensitive to sudden changes in water chemistry and requires excellent water quality. Benefits from a gentle current.
Informazioni in natura
- Stato di conservazione: least concern
- Stagionalità: Breeding in the wild is often associated with the rainy season, but specific seasonal behavior patterns are not extensively documented for this species.
- Prezzo di mercato: Moderate
- Importanza commerciale: medium
- Sapore: Not typically consumed due to small size and bony structure.
- Consistenza: Not applicable for culinary purposes.
- Valore nutrizionale: Not applicable for culinary purposes.
Fatti chiave
Natural Camouflagebehavior
Its transparency is a highly effective form of camouflage in its natural habitat, making it difficult for predators to spot.
Social Creaturesbehavior
Glass Catfish are obligate schooling fish; they become stressed, shy, and prone to illness if not kept in groups of at least six individuals.
Taxonomic Revisionevolution
For decades, the aquarium trade species was misidentified as Kryptopterus bicirrhis. A 2013 study by Ng and Kottelat formally described it as a distinct species, Kryptopterus vitreolus.
No Dorsal Fininteresting
One of its most unique morphological features is the complete absence of a visible dorsal fin, which is unusual for a catfish.
Informazioni di sicurezza
Sicuro- Livello di sicurezza: safe
- Velenoso: No
- Commestibilità: not recommended
- Note sul maneggio: No specific handling precautions are required beyond general care for delicate fish. Avoid sudden movements or loud noises as they are easily startled. Do not handle with bare hands if possible, use a soft net.
Specie simili
Iridescent Shark Catfish
Pangasianodon hypophthalmus
While also a catfish, the Iridescent Shark is much larger, opaque, and has a more robust, shark-like body shape. It is not transparent.
Indian Glassy Fish
Parambassis ranga
Also transparent, but belongs to a different family (Ambassidae). It has a distinct dorsal fin and a more compressed, deeper body shape. Often sold dyed in the aquarium trade, which K. vitreolus is not.
Kryptopterus bicirrhis
Kryptopterus bicirrhis
Historically confused. K. bicirrhis is generally larger (up to 15 cm), less transparent, and has a more westerly distribution (Sumatra, Borneo, Malay Peninsula). K. vitreolus is smaller (up to 6.5 cm) and more transparent, found in mainland Southeast Asia. Fin ray counts and vertebral counts also differ.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Actinopterygii
- Ordine
- Siluriformes
- Famiglia
- Siluridae
- Genere
- Kryptopterus
- Specie
- Kryptopterus vitreolus
Esplora Glass Catfish
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