How to Identify Congo Tetra

To identify Congo Tetra (Phenacogrammus interruptus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Males display a vibrant iridescent coloration, ranging from blue and green to gold and violet, particularly along the flanks. The dorsal fin often has a white edge, and the caudal fin can have orange or reddish hues. Females are generally less colorful, with a more subdued silvery-gold sheen. Both sexes have a dark lateral line running from the operculum to the caudal peduncle.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Iridescent scales, particularly prominent in males., Elongated, flowing dorsal, anal, and caudal fins in mature males., Adipose fin present, characteristic of characiforms.

Dorsal fin

Single, relatively tall, and often elongated in males, with a white leading edge.

Tail fin

Forked, with the central rays often extended in mature males, giving a 'lyre-tail' appearance.

Pectoral fin

Transparent, typically small and rounded.

Distinctive fins

Anal fin is long and flowing in males, extending almost to the caudal fin. Pelvic fins are small.

Identification Tips

1. 1

   Size and Shape

   Adult males can reach up to 8.5 cm (3.3 inches) in standard length, while females are slightly smaller, typically around 6 cm (2.4 inches). The body is laterally compressed and elongated, with a distinct torpedo-like profile.

2. 2

   Coloration

   Look for the striking iridescent blues, greens, and golds on the flanks, especially in males. The white-edged dorsal fin and the extended central rays of the caudal fin in males are key identifiers.

3. 3

   Fin Morphology (Males)

   The most distinguishing feature of mature males is their elaborate, flowing fins – particularly the dorsal, anal, and caudal fins, which are significantly longer and more ornate than those of females or other similar species.

4. 4

   Schooling Behavior

   They are almost always found in schools, a characteristic behavior that helps differentiate them from solitary species.

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