How to Identify Lumpfish

To identify Lumpfish (Cyclopterus lumpus), look at these key features.

Physical Characteristics

Body shape

rounded

Coloration

Adults typically range from grey-blue, olive-green, or brownish on the dorsal side, fading to lighter shades ventrally. During the breeding season, males develop striking red-orange to reddish-brown coloration, particularly on the belly and fins, while females remain more subdued. Juveniles are often mottled brown or green for camouflage.

Scale type

none

Mouth position

superior

Distinctive features

Globular, 'lumpy' body shape, Rows of bony tubercles (ossicles) covering the skin, replacing scales, Modified pelvic fins forming a powerful ventral adhesive disc (sucker), Two dorsal fins, the first often embedded in a fleshy crest in adults, Small, upturned mouth

Dorsal fin

Two dorsal fins. The first dorsal fin is typically low and fleshy, often embedded in a crest of skin in adults, making it appear absent. The second dorsal fin is soft-rayed and distinct.

Tail fin

Caudal fin is rounded or slightly truncate.

Pectoral fin

Large, fan-like pectoral fins.

Distinctive fins

Pelvic fins are modified into a large, circular, ventral adhesive disc, located anterior to the pectoral fins.

Identification Tips

1. 1

   Body Shape and Skin

   Look for the characteristic globular, 'lumpy' body covered in rows of bony tubercles, not scales. This is the most immediate identifier.

2. 2

   Adhesive Disc

   Observe the prominent, circular suction cup on the underside of the fish, formed by modified pelvic fins. This allows them to cling to surfaces.

3. 3

   Coloration (Sexual Dimorphism)

   Note the color. Breeding males are typically bright red-orange, while females are more grey-blue or olive. Non-breeding individuals are generally duller.

4. 4

   Dorsal Fins

   The first dorsal fin is often reduced and embedded in a fleshy crest, which can make it appear absent or as a series of bumps.

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