How to Identify Stout Longjaw

To identify Stout Longjaw (Belonidae Strongylura strongylura), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface is typically greenish-blue to dark green, fading to silvery-white on the flanks and belly. A prominent dark lateral stripe may be present. The caudal fin often has a distinct dark spot at its base, which can be a key identification feature.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Extremely elongated, slender body, Long, pointed jaws (beak-like) with numerous sharp teeth, Dorsal and anal fins set far back on the body, nearly opposite each other, Often a dark spot at the base of the caudal fin

Dorsal fin

Single dorsal fin, typically with 13-16 soft rays, positioned far back on the body, opposite the anal fin.

Tail fin

Caudal fin is truncate to slightly emarginate, often with a distinct dark spot at its base.

Pectoral fin

Small, located low on the body.

Distinctive fins

Pelvic fins are small and abdominal in position. All fins are generally translucent or slightly dusky.

Identification Tips

1. 1

   Body Shape

   Look for the extremely elongated, cylindrical body, characteristic of needlefish.

2. 2

   Jaws

   Observe the long, slender, beak-like jaws, which are of roughly equal length and filled with numerous sharp teeth.

3. 3

   Caudal Fin Spot

   A key distinguishing feature is the prominent dark spot, often round or oval, at the base of the caudal fin. This spot can vary in intensity but is usually present.

4. 4

   Fin Placement

   Note the dorsal and anal fins are positioned far back on the body, almost directly opposite each other.

5. 5

   Coloration

   The greenish-blue to dark green dorsal coloration contrasting with silvery sides is typical.

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