How to Identify Ribbonfish

To identify Ribbonfish (Trachipterus trachypterus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

The body is predominantly silvery, often with iridescent reflections. The dorsal fin, caudal fin, and pelvic fins are typically bright red or reddish-orange. Juveniles may have dark spots or bars on their flanks.

Scale type

none

Mouth position

superior

Distinctive features

Extremely elongated, ribbon-like and laterally compressed body., Large, prominent eyes., Small, upward-pointing mouth., Absence of an anal fin., Pelvic fins are often long and filamentous in juveniles, becoming shorter in adults., A series of bony tubercles or scutes along the lateral line.

Dorsal fin

A single, very long dorsal fin extending almost the entire length of the body, originating just behind the head. It consists of numerous soft rays (typically 150-180). The anterior rays are often elongated and form a crest.

Tail fin

The caudal fin is unique, typically consisting of two distinct lobes. The upper lobe is often directed upwards and is much longer than the lower lobe, which is small or absent. The rays are often red.

Pectoral fin

Small and positioned low on the body.

Distinctive fins

Pelvic fins are thoracic, often long and filamentous in juveniles, reducing in size with age. They are typically reddish. The anal fin is completely absent.

Identification Tips

1. 1

   Body Shape

   Look for the extremely elongated, ribbon-like, and highly compressed body. This is the most defining characteristic.

2. 2

   Fin Coloration

   The bright red or reddish-orange dorsal, caudal, and often pelvic fins are a key identifier against the silvery body.

3. 3

   Dorsal Fin

   Note the single, very long dorsal fin running almost the entire length of the back, often with elongated anterior rays forming a crest.

4. 4

   Caudal Fin

   Observe the distinctive caudal fin, typically with a much longer, upward-pointing upper lobe and a reduced or absent lower lobe.

5. 5

   Absence of Anal Fin

   The complete lack of an anal fin is a crucial diagnostic feature for the family Trachipteridae.

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