How to Identify Tub Gurnard

To identify Tub Gurnard (Chelidonichthys lucerna), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Highly variable, typically reddish-brown to orange-red on the dorsal side, fading to pinkish or whitish on the belly. The pectoral fins are often brightly colored, ranging from blue to green with iridescent spots and a dark margin, sometimes with a prominent dark spot at the base. Juveniles may have more pronounced banding.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Large, bony, armored head with several spines and ridges., Two separate dorsal fins., Three free, finger-like rays at the bottom of each pectoral fin, used for 'walking' on the seabed and sensing prey., Large, fan-like pectoral fins, often with striking coloration., Relatively large eyes positioned dorsally.

Dorsal fin

Two dorsal fins: the first with 9-11 spines, the second with 16-17 soft rays. The first dorsal fin is typically higher.

Tail fin

Caudal fin is truncate or slightly emarginate.

Pectoral fin

Large, fan-shaped, with 10-11 rays, plus 3 free, detached rays below. These free rays are thick and used for locomotion and chemoreception.

Distinctive fins

Anal fin with 14-16 soft rays. Pelvic fins are thoracic.

Identification Tips

1. 1

   Head Armor

   The head is large, bony, and covered with prominent ridges and spines, particularly noticeable on the operculum and preoperculum.

2. 2

   Pectoral Fins

   The most striking feature is the large, wing-like pectoral fins, often iridescent blue or green with a dark margin and sometimes a large black spot. The three free rays at the bottom of each pectoral fin are unique to gurnards and are used for 'walking' and sensing.

3. 3

   Coloration

   Overall body color is typically reddish-brown to orange-red dorsally, fading to lighter shades ventrally. This can vary depending on habitat and depth.

4. 4

   Sound Production

   When handled or disturbed, Tub Gurnards often emit a distinctive grunting or croaking sound, produced by vibrating their swim bladder.

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