How to Identify Asian Sheepshead Wrasse

To identify Asian Sheepshead Wrasse (Semicossyphus reticulatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Adult males exhibit a striking coloration, typically reddish-brown to greyish-brown on the body, often with lighter ventral regions. The most distinctive feature is the large, bulbous forehead and chin, which can be pale pink to whitish. Females and juveniles are generally reddish-brown to dull orange, lacking the prominent head protuberances. Juveniles may have a more mottled pattern.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Prominent bulbous forehead and chin in mature males (sexual dimorphism), Large, thick lips, Strong, conical teeth adapted for crushing shells, Large scales, Robust body

Dorsal fin

Single, long dorsal fin with 12 spines and 10 soft rays. The spiny portion is longer than the soft-rayed portion.

Tail fin

Truncate to slightly rounded caudal fin.

Pectoral fin

Large, rounded pectoral fins.

Distinctive fins

Anal fin with 3 spines and 12 soft rays. Pelvic fins are relatively small.

Identification Tips

1. 1

   Head Shape (Males)

   Look for the extremely pronounced, bulbous forehead and chin in adult males, which is a key distinguishing feature.

2. 2

   Size

   These are large wrasses, reaching over a meter in length, which helps differentiate them from smaller wrasse species.

3. 3

   Coloration

   Adult males are typically reddish-brown to greyish with a lighter head protuberance, while females are more uniformly reddish-brown.

4. 4

   Habitat

   Found exclusively in rocky reef environments in temperate Western Pacific waters.

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