How to Identify Largemouth Yellowfish

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

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface is typically olive-green to brownish, fading to silvery-white on the flanks and belly. Fins are often yellowish to golden, especially the caudal, anal, and pelvic fins. Some individuals may exhibit a more pronounced golden sheen over their entire body, particularly in clear water environments.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Large, subterminal mouth extending to below the anterior margin of the eye., Two pairs of barbels: a shorter anterior (rostral) pair and a longer posterior (maxillary) pair., Relatively large, cycloid scales., A prominent, often slightly humped, dorsal profile in larger individuals., A strong, unserrated dorsal fin spine.

Dorsal fin

Single dorsal fin with 3-4 unbranched rays and 8-9 branched rays. The last unbranched ray is strong and bony, but not serrated.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Paired pectoral fins, typically clear to yellowish.

Distinctive fins

Pelvic fins are abdominal, located behind the pectoral fins. All fins, especially the caudal and anal, often display a distinct yellow or golden hue.

Identification Tips

1. 1

   Mouth Size and Position

   The most distinguishing feature is its large, subterminal mouth that extends to below the eye. This is a key differentiator from other yellowfish species.

2. 2

   Barbels

   Possesses two pairs of barbels; the posterior (maxillary) pair is noticeably longer than the anterior (rostral) pair.

3. 3

   Dorsal Fin Spine

   The last unbranched ray of the dorsal fin is strong and bony but lacks serrations, unlike some other Labeobarbus species.

4. 4

   Scale Size

   Has relatively large scales compared to other yellowfish species in its range.

5. 5

   Coloration

   While variable, the golden-yellow coloration of the fins, especially the caudal and anal fins, is often a good indicator.

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