How to Identify Red-eye Tetra

To identify Red-eye Tetra (Moenkhausia sanctaefilomenae), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Silvery body with iridescent scales. The most striking feature is the bright red iris of the eye. A prominent black spot is present on the caudal peduncle, extending onto the base of the caudal fin, often with a lighter, sometimes yellowish, area anterior to it. Fins are generally hyaline (clear) to slightly yellowish.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Bright red iris, Black spot on caudal peduncle/caudal fin base, Silvery body with iridescent sheen

Dorsal fin

Single dorsal fin, typically with 10-11 rays. Originates slightly posterior to the pelvic fin origin.

Tail fin

Forked caudal fin, with the black spot extending onto its base.

Pectoral fin

Paired pectoral fins, relatively small.

Distinctive fins

Adipose fin present, typical of characins.

Identification Tips

1. 1

   Eye Coloration

   The most reliable identifier is the bright red iris, which gives the fish its common name.

2. 2

   Caudal Spot

   A distinct black spot at the base of the caudal fin, often with a lighter anterior border, is a key characteristic.

3. 3

   Body Shape and Color

   A relatively deep, compressed, silvery body with an iridescent sheen.

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