How to Identify Shortfin flyingfish

To identify Shortfin flyingfish (Exocoetus brachypterus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Dorsal surface is iridescent blue to dark blue, fading to silvery white on the ventral side. Fins are generally dusky or translucent.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Relatively short pectoral fins that do not reach the dorsal fin origin when folded back., Pelvic fins are short and located abdominally, not reaching the anal fin origin., Absence of barbels or prominent spines., Lower lobe of caudal fin is longer than the upper lobe.

Dorsal fin

Single, relatively small dorsal fin located posteriorly, opposite the anal fin.

Tail fin

Deeply forked, with the lower lobe significantly longer than the upper lobe, aiding in propulsion during aerial glides.

Pectoral fin

Paired, relatively short, and broad pectoral fins, not extending beyond the dorsal fin origin. Used for initial lift during leaps.

Distinctive fins

Pelvic fins are small and located far forward on the abdomen.

Identification Tips

1. 1

   Pectoral Fin Length

   The most distinguishing feature is its relatively short pectoral fins. When folded back, they do not extend to the origin of the dorsal fin. This contrasts with 'four-winged' flyingfish species where pectoral fins are much longer.

2. 2

   Pelvic Fin Length and Position

   Pelvic fins are short and located abdominally, not reaching the anal fin origin. This differentiates it from other flyingfish that may have longer pelvic fins.

3. 3

   Body Shape and Coloration

   Streamlined, torpedo-shaped body with a dark blue dorsal surface and silvery-white belly, typical of pelagic fish for camouflage in open water.

4. 4

   Absence of Barbles

   Lacks any barbels or prominent fleshy appendages on the chin, which can be present in some other fish families.

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