How to Identify Yellowfin Leatherjacket

To identify Yellowfin Leatherjacket (Meuschenia flavolineata), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Highly variable, typically mottled brown, green, or grey with irregular darker blotches and spots, allowing for excellent camouflage. The most distinctive feature is the bright yellow to orange stripe or series of spots along the base of the dorsal fin and often extending onto the caudal peduncle. Fins are often yellowish, especially the caudal fin.

Scale type

none

Mouth position

terminal

Distinctive features

Prominent, erectile dorsal spine with a smaller second spine behind it, forming a locking mechanism., Rough, leathery skin with small, bristly scales (setae)., Small, protrusible mouth with strong, incisor-like teeth., Bright yellow to orange stripe or spots along the dorsal fin base and caudal peduncle., Often has a dark spot or blotch on the caudal fin base.

Dorsal fin

Two dorsal fins; the first consists of a strong, erectile spine followed by a much smaller, locking spine. The second dorsal fin is soft-rayed, typically with 30-34 rays.

Tail fin

Rounded to slightly truncate caudal fin, often yellowish.

Pectoral fin

Small, rounded pectoral fins, typically with 12-14 rays.

Distinctive fins

Anal fin similar in shape and size to the soft dorsal fin, with 28-32 rays. Pelvic fin reduced to a spine-like structure or absent, often with a dewlap of skin.

Identification Tips

1. 1

   Coloration and Pattern

   Look for the mottled body coloration (browns, greens, greys) and the characteristic bright yellow to orange stripe or spots along the base of the soft dorsal fin and caudal peduncle. The caudal fin is often yellowish.

2. 2

   Dorsal Spine

   Observe the prominent, erectile first dorsal spine, which can be locked upright. This is a key feature of all leatherjackets.

3. 3

   Skin Texture

   Note the rough, leathery texture of the skin, which lacks typical scales.

4. 4

   Mouth

   Examine the small, terminal mouth with strong, incisor-like teeth.

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