How to Identify Redfin Emperor

To identify Redfin Emperor (Lethrinus erythracanthus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Body color is typically greyish-brown to olive-green dorsally, fading to lighter shades ventrally. Distinctive features include scattered orange or yellow spots on the head and body, particularly prominent on the operculum and cheeks. The most striking feature is the bright red or orange coloration of the pectoral, pelvic, and anal fins, and often the caudal fin margins. The dorsal fin may also have reddish hues. Some individuals may display irregular dark blotches or bars, especially when stressed or at night.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Bright red or orange pectoral, pelvic, and anal fins., Scattered orange or yellow spots on head and body., Relatively deep body with a steep dorsal profile., Large, prominent eyes., Terminal mouth with strong canine-like teeth at the front and molariform teeth on the sides.

Dorsal fin

Single dorsal fin with 10 spines and 9-10 soft rays. The spinous portion is relatively low, and the soft-rayed portion is slightly higher.

Tail fin

Moderately forked caudal fin, often with reddish margins.

Pectoral fin

Long and pointed pectoral fins, typically bright red or orange.

Distinctive fins

Pelvic fins are also bright red or orange, located thoracically. Anal fin has 3 spines and 8 soft rays, also often reddish.

Identification Tips

1. 1

   Fin Coloration

   The most reliable identifier is the vivid red or orange color of the pectoral, pelvic, and anal fins. This is a consistent feature across its range.

2. 2

   Body Spots

   Look for scattered orange or yellow spots on the head and body, particularly on the operculum and cheeks. These spots can vary in intensity but are usually present.

3. 3

   Body Shape

   Note the relatively deep body and steep dorsal profile, characteristic of many Lethrinus species, but combined with the fin coloration, it aids identification.

4. 4

   Mouth and Teeth

   Observe the terminal mouth with strong canine-like teeth at the front and molariform teeth on the sides, adapted for crushing shells of prey.

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