How to Identify Mountain-stream Catfish

To identify Mountain-stream Catfish (Amphilius uranoscopus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Variable, typically mottled brown, grey, or olive with darker blotches and irregular bands, providing excellent camouflage against rocky substrates. The ventral surface is usually paler, often whitish or yellowish. Fins may have faint banding.

Scale type

none

Mouth position

inferior

Distinctive features

Large, dorsally positioned eyes (uranoscopus means 'sky-gazer'), Four pairs of barbels: one nasal, one maxillary, and two mandibular pairs. Maxillary barbels are typically long, reaching beyond the pectoral fin base., Depressed head and body, particularly anteriorly, adapted for benthic life in fast currents., Strongly developed pectoral and pelvic fins, often broad and flattened, used for gripping substrates.

Dorsal fin

Short, with a strong, serrated spine and 6-7 soft rays. Positioned anteriorly.

Tail fin

Slightly emarginate to forked, with rounded lobes. Caudal peduncle is relatively slender.

Pectoral fin

Broad and horizontally oriented, with a strong, serrated spine and 7-9 soft rays. Used as hydrofoils and for gripping.

Distinctive fins

Pelvic fins are also broad and horizontally oriented, often with a fleshy base, positioned abdominally. Adipose fin is present, relatively small and distinct.

Identification Tips

1. 1

   Eye Position

   The most striking feature is the large, upward-pointing eyes, giving it a 'stargazer' appearance, which is unique among many African catfishes.

2. 2

   Body Shape and Fins

   Its flattened ventral surface, depressed head, and broad, horizontally oriented pectoral and pelvic fins are adaptations for clinging to rocks in strong currents.

3. 3

   Barbels

   Presence of four pairs of barbels, with the maxillary barbels being notably long, extending past the pectoral fin base.

4. 4

   Coloration

   Mottled brown/grey/olive camouflage pattern helps it blend seamlessly with rocky stream beds.

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