How to Identify Red-tailed Hemiodus

To identify Red-tailed Hemiodus (Hemiodus gracilis), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Silvery body with a prominent, often intense, red caudal fin. A distinct black spot or blotch is typically present at the base of the caudal fin, extending onto the lower lobe. Some individuals may exhibit a faint lateral line.

Scale type

cycloid

Mouth position

superior

Distinctive features

Elongated, torpedo-shaped body, Bright red caudal fin, Black spot at the caudal fin base, Small, upturned mouth

Dorsal fin

Single, relatively small dorsal fin located mid-body.

Tail fin

Deeply forked caudal fin, with the lower lobe often more elongated and intensely red than the upper lobe. The black spot is a key feature here.

Pectoral fin

Small and transparent, positioned low on the body.

Distinctive fins

Adipose fin present, typical of characins.

Identification Tips

1. 1

   Caudal Fin Coloration

   The most striking and reliable identification feature is the bright red caudal fin, often with a black spot at its base.

2. 2

   Body Shape

   Its slender, elongated, and somewhat compressed body distinguishes it from more robust characins.

3. 3

   Mouth Position

   The small, upturned mouth is indicative of its surface-feeding habits.

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