How to Identify Eared Blackfish

To identify Eared Blackfish (Melanonus zugmayeri), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Uniformly dark brown to black, often with a slightly paler ventral surface. Fins are typically dark.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Elongated, slender body, tapering towards the tail., Large eyes, adapted for low light conditions., Prominent otoliths (ear stones) that are often used for species identification and age determination., Absence of a chin barbel.

Dorsal fin

Two dorsal fins; the first is short-based with 3-5 rays, and the second is long-based, extending almost to the caudal fin, with 70-80 rays.

Tail fin

Small, forked caudal fin.

Pectoral fin

Small, positioned low on the body, with 12-15 rays.

Distinctive fins

Pelvic fins are small, jugular (positioned anterior to the pectoral fins), with 7-8 rays.

Identification Tips

1. 1

   Body Shape and Coloration

   Look for a uniformly dark, elongated, and slender body. The overall dark pigmentation is a key adaptation to its deep-sea habitat.

2. 2

   Fin Structure

   Note the two dorsal fins, with the second being significantly longer than the first. The small, jugular pelvic fins are also characteristic.

3. 3

   Otoliths

   While not visible externally, the morphology of the otoliths (sagittae) is a crucial diagnostic feature for ichthyologists, often used to distinguish it from other deep-sea gadiforms.

4. 4

   Absence of Chin Barbel

   Unlike many other deep-sea gadiforms, Melanonus zugmayeri lacks a chin barbel, which can help differentiate it.

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