How to Identify Brown Wrasse

To identify Brown Wrasse (Labrus merula), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Highly variable. Males are typically dark blue to greenish-blue, often with a distinct black spot at the base of the caudal fin and sometimes a white or yellowish stripe along the lateral line. Females and juveniles are generally brown to reddish-brown, mottled with lighter patches, and may also have the caudal spot. The belly is usually lighter. Coloration can change rapidly depending on mood, activity, and reproductive state.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Robust body with a relatively deep profile., Thick, fleshy lips., Large, prominent scales., A single, long dorsal fin., Often a dark spot at the base of the caudal fin, especially in males.

Dorsal fin

Single, long dorsal fin with 18-21 spines and 9-13 soft rays. The spiny portion is longer than the soft-rayed portion.

Tail fin

Rounded to slightly truncate caudal fin.

Pectoral fin

Large and rounded pectoral fins.

Distinctive fins

Pelvic fins are thoracic, located beneath the pectoral fins.

Identification Tips

1. 1

   Coloration

   Observe the overall body color. Males are typically blue-green, while females and juveniles are brown. Look for the characteristic dark spot at the caudal fin base, which is often more pronounced in males.

2. 2

   Body Shape and Size

   Note the robust, compressed body and thick lips. Adults can reach up to 40-45 cm (16-18 inches) in length, making them one of the larger wrasse species in their range.

3. 3

   Fin Structure

   Examine the single, long dorsal fin with its distinct spiny and soft-rayed portions. The caudal fin is rounded.

4. 4

   Habitat Preference

   Look for them in rocky reef environments, especially among seagrass beds, which are their preferred foraging grounds.

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