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Spectracanthicus murinus is a South American armored catfish associated with the clear, oxygen-rich and rocky waters of the Rio Tapajós in Brazil. It remains a relatively uncommon aquarium fish, sought after by aquarists interested in loricariids from specialized natural habitats. Its plated body, sucker mouth and mainly nocturnal activity reflect adaptations typical of current-dwelling suckermouth catfish. Aquarium specimens are collected from the wild, so careful acclimation is especially important, along with excellent water quality, strong oxygenation and suitable shelter. This species is best kept by aquarists able to maintain a stable, mature aquarium rather than by beginners.

General description

Spectracanthicus murinus is an armored catfish in the family Loricariidae, belonging to the group of suckermouth loricariids. It inhabits areas where current keeps the water clear and highly oxygenated. Like several related species, it is most active at dusk and during the night, exploring rocks and submerged surfaces while feeding. Its aquarium availability is moderately uncommon, making it better suited to keepers who can reproduce a stable environment than to beginners. A spacious aquarium, efficient filtration and secure hiding places are important. Wild-collected individuals should be acclimated gradually and watched closely during the first weeks. Good oxygenation and low organic waste are key to long-term condition.

Geographical origin and biotope

The known range of Spectracanthicus murinus is in Brazil, within the Rio Tapajós basin. Its natural habitat includes tropical stretches with rocky outcrops, boulders and crevices that provide resting surfaces and shelter. Local current may be strong, while the water is generally clear and oxygen-rich. Aquatic plants are not necessarily abundant in rocky areas, although riparian vegetation and fallen branches help structure the margins and provide additional cover. In the aquarium, use a stable rocky layout, caves of different sizes and vigorous water movement without creating stagnant areas. Clean, well-oxygenated water is more important than a densely planted display. Smooth surfaces and shaded retreats are particularly useful.

Precise location and local name

Spectracanthicus murinus is associated with the Rio Tapajós in Brazil, in the Amazon region. The most practical trade name is its scientific name, sometimes accompanied by a general label such as murinus pleco. L-number codes may appear in the loricariid trade, but they do not replace scientific identification. For a wild-collected species, keeping the provenance information supplied by the vendor is especially useful, including river system, arrival size and acquisition date. These details help compare specimens and reduce the risk of mixing it with visually similar loricariids from the same region. Accurate records are valuable for responsible aquarium keeping.

Appearance and physical characteristics

The body of Spectracanthicus murinus is protected by bony plates and supported by a ventral sucker mouth adapted for gripping rocks. Its shape is sturdy, with a flattened head, broad pectoral fins and a well-developed dorsal fin. The general coloration is dark and earthy, helping it blend among rocks and shaded areas. The specific name murinus refers to a mouse-grey coloration. Markings may vary with age, stress and lighting. As in many loricariids, the fins and body plates can appear more or less contrasted depending on the fish’s condition. A mature specimen should show a well-filled abdomen rather than a sunken profile.

General diet

Spectracanthicus murinus should receive a varied diet with a strong vegetable component and plenty of fibre. Offer catfish tablets, algae-based wafers, blanched vegetables such as zucchini and cucumber, and suitable wood. Wood does not replace a complete diet, but it provides grazing surfaces and fibre useful to many loricariids. Protein-rich foods may be offered occasionally, particularly to growing fish, but should not form the basis of the diet. Feed after the lights have been dimmed or switched off to match its nocturnal activity. Insufficient food is often indicated by a hollow abdomen and reduced activity. Remove uneaten food promptly, especially in a high-flow aquarium where debris can collect behind rocks.

Essential data

• River of origin: Rio Tapajós
• Local name used: Murinus pleco
• Origin of the scientific name: Spectracanthicus is the genus name; murinus is the specific epithet.
• Full-name etymology: Spectracanthicus combines roots suggesting a remarkable or spectral appearance with a reference to spiny characteristics; murinus means mouse-grey in Latin.
• Common or vernacular names: Murinus pleco
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: spek tra KAN thi kuss - mu RY nus
• Discovery: Albert J. P. Nijssen and Isaäc J. H. Isbrücker, 1987
• Maximum adult size: approximately 20 cm
• Water temperature and pH: approximately 24–29 °C; slightly acidic to neutral pH
• Watercourse appearance and surrounding vegetation: clear, flowing and highly oxygenated water; rocky substrate, riparian vegetation and woody debris
• Typical tankmates: small Amazonian characins, rheophilic cichlids and other peaceful bottom fish suited to current
• Temperament and behaviour: generally peaceful, secretive and mainly nocturnal; some territoriality may occur around shelters
• Water depth: shallow to moderately deep areas near rocks and cover
• Sexual dimorphism: mature males may have broader heads and more pronounced odontodes; sexing can be difficult
• Bottom structure and flow: rocks, boulders, crevices and gravel; moderate to strong current

For greater success

Success with Spectracanthicus murinus depends on stable water, excellent oxygenation and a layout with several shelters. Because this is a wild-collected species, quarantine and slow acclimation are recommended. Use efficient filtration, remove organic waste regularly and provide a fibre-rich diet after dark. Avoid excessive competition for caves and overly aggressive tankmates. Well-distributed current, securely positioned rocks and regular water changes will help this relatively uncommon loricariid remain in good condition. A mature aquarium with dependable maintenance is preferable to a newly established system, especially during the first months after arrival.