How to Identify Smallmouth Largemouth Yellowfish

To identify Smallmouth Largemouth Yellowfish (Labeobarbus aeneus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Generally silvery-grey to olive-brown on the back, fading to silvery-white on the belly. Fins are often dusky, sometimes with a yellowish or reddish tinge, particularly during breeding season when males can develop a striking golden-yellow hue. Juveniles may have faint dark spots or bars.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Relatively small, subterminal mouth with fleshy lips and two pairs of barbels (anterior and posterior)., Large, cycloid scales., Deeply forked caudal fin., Robust, muscular body., The last unbranched ray of the dorsal fin is strong and serrated.

Dorsal fin

Single, relatively short-based dorsal fin with 3-4 unbranched rays and 8-9 branched rays. The last unbranched ray is strong and serrated.

Tail fin

Deeply forked caudal fin with pointed lobes.

Pectoral fin

Paired pectoral fins, typically clear to dusky.

Distinctive fins

Pelvic fins are abdominal, located beneath the dorsal fin. Anal fin is short-based with 3 unbranched and 5 branched rays.

Identification Tips

1. 1

   Mouth Size

   Despite its common name 'Smallmouth Largemouth Yellowfish', its mouth is relatively small compared to other large Labeobarbus species, and it is subterminal. The 'largemouth' part of the name is often a misnomer or refers to a historical confusion with other species.

2. 2

   Barbels

   Possesses two pairs of prominent barbels around the mouth, which are sensory organs used for foraging.

3. 3

   Dorsal Fin Ray

   The last unbranched ray of the dorsal fin is strong and serrated, a key characteristic of many Labeobarbus species.

4. 4

   Coloration

   While generally silvery, look for golden-yellow hues, especially in males during the breeding season, which can be quite striking.

5. 5

   Body Shape

   Its torpedo-shaped, muscular body is indicative of a fish adapted to strong river currents.

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