How to Identify Breca

To identify Breca (Gymnocharacinus bergii), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Generally translucent to pale yellowish-brown, often with a silvery sheen on the flanks. The internal organs are sometimes visible through the skin due to the lack of scales. Fins are typically hyaline (clear).

Scale type

none

Mouth position

terminal

Distinctive features

Absence of scales on the body, giving it a smooth, 'naked' appearance., Relatively small size, typically reaching up to 8-10 cm (3-4 inches) in standard length., Laterally compressed body., Large eyes relative to head size.

Dorsal fin

Single dorsal fin, relatively short, located mid-body.

Tail fin

Forked caudal fin.

Pectoral fin

Well-developed pectoral fins.

Distinctive fins

Adipose fin is present, a characteristic of many characins. All fins are generally clear or hyaline.

Identification Tips

1. 1

   Scales

   The most definitive feature is the complete absence of scales on its body, making it smooth and somewhat translucent.

2. 2

   Body Shape and Coloration

   Elongated, laterally compressed body, typically pale yellowish-brown to silvery, often with visible internal organs.

3. 3

   Geographic Location

   Its occurrence is strictly limited to the specific thermal springs in Patagonia, Argentina. Any characin-like fish found in this precise habitat lacking scales is almost certainly Gymnocharacinus bergii.

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