How to Identify Common Dragonet

To identify Common Dragonet (Callionymus lyra), look at these key features.

Physical Characteristics

Body shape

flat

Coloration

Highly variable and sexually dimorphic. Males are typically more brightly colored with intricate patterns of orange, blue, yellow, and brown spots and lines on a pale background. Females are generally duller, often mottled brown and grey, providing camouflage. Both sexes have iridescent blue spots on the head and body.

Scale type

none

Mouth position

superior

Distinctive features

Large, upward-pointing eyes, Small, protractile mouth, Two distinct dorsal fins, Elongated first dorsal fin spine in males, Long, tapering caudal fin

Dorsal fin

Two dorsal fins. The first dorsal fin has 4 spines, with the first spine being greatly elongated in mature males, often reaching beyond the caudal fin. The second dorsal fin has 9-10 soft rays. In males, the first dorsal fin is often adorned with vibrant colors and patterns used in courtship.

Tail fin

Long, tapering, and pointed caudal fin, often with filamentous extensions in males.

Pectoral fin

Large, fan-like pectoral fins with 18-20 rays, used for scuttling along the substrate.

Distinctive fins

Pelvic fins are jugular (located anterior to the pectoral fins) and well-developed, used for support and maneuvering on the seabed. Anal fin has 9 soft rays.

Identification Tips

1. 1

   Sexual Dimorphism

   Males are significantly more colorful and possess a much longer first dorsal fin spine and often longer caudal fin filaments than females. This is the most reliable distinguishing feature.

2. 2

   Coloration and Pattern

   Look for the intricate patterns of spots and lines, especially the iridescent blue spots on the head and body. Males exhibit more vibrant orange, blue, and yellow hues.

3. 3

   Fin Structure

   The two distinct dorsal fins, with the first being spiny and the second soft-rayed, are characteristic. The elongated first dorsal spine in males is unmistakable.

4. 4

   Body Shape

   Their flattened ventral surface and slightly depressed head allow them to lie low on the seabed.

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