How to Identify Longhorn Sculpin

To identify Longhorn Sculpin (Myoxocephalus octodecemspinosus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Highly variable, typically mottled brown, olive, or gray on the dorsal side, fading to lighter shades on the ventral side. Irregular dark bands or blotches often present on the body and fins, providing excellent camouflage against rocky or sandy substrates. Some individuals may exhibit reddish or yellowish tints.

Scale type

none

Mouth position

terminal

Distinctive features

Very large head, comprising about one-third of the total body length., Prominent, elongated preopercular spines (often 2-4, with the uppermost being the longest, extending beyond the operculum)., Two dorsal fins, the first spiny and the second soft-rayed., Pectoral fins are large and fan-like., Body covered in small, rough prickles (tubercles) rather than true scales., Large, upward-pointing eyes.

Dorsal fin

Two dorsal fins: first with 8-11 strong spines; second with 13-16 soft rays. The first dorsal fin is typically lower than the second.

Tail fin

Caudal fin is rounded or slightly truncate, often with dark bands.

Pectoral fin

Large, fan-shaped pectoral fins with 16-19 rays, often banded.

Distinctive fins

Pelvic fins are small, jugular (located anterior to the pectoral fins), with one spine and 3 soft rays. Anal fin has 11-14 soft rays.

Identification Tips

1. 1

   Preopercular Spines

   Look for the exceptionally long, sharp spine on the upper part of the preoperculum (cheek bone), which extends well past the operculum. This is the most definitive feature.

2. 2

   Body Texture

   Feel for the rough, prickly skin, which lacks true scales. This distinguishes it from many other fish species.

3. 3

   Head Size

   Note the disproportionately large head compared to the rest of the body.

4. 4

   Coloration and Pattern

   Observe the mottled brown/olive/gray coloration with irregular dark bands, which provides excellent camouflage.

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