How to Identify Spiny Eel

To identify Spiny Eel (Macrognathus pancalus), look at these key features.

Physical Characteristics

Body shape

eel-like

Coloration

The body is typically light brown to olive-green, often adorned with irregular dark brown to black blotches or bars along the flanks. A series of ocelli (eye-spots) or dark spots may be present along the dorsal fin base. The ventral side is usually lighter.

Scale type

cycloid

Mouth position

inferior

Distinctive features

Elongated, snake-like body, Pointed, proboscis-like snout with a small mouth, Separate dorsal fin spines preceding the soft-rayed dorsal fin, Small, embedded scales

Dorsal fin

Consists of 20-26 isolated, sharp spines followed by a soft-rayed portion with 44-54 rays. The spiny and soft-rayed portions are continuous or nearly so.

Tail fin

Rounded to slightly emarginate, confluent with the dorsal and anal fins in some individuals, but typically distinct.

Pectoral fin

Small and rounded, typically with 20-25 rays.

Distinctive fins

The anal fin is long, with 3 spines and 44-54 soft rays, similar in length and structure to the soft-rayed dorsal fin. Pelvic fins are absent.

Identification Tips

1. 1

   Body Shape

   Look for the distinctly elongated, eel-like body, which is laterally compressed.

2. 2

   Snout

   Observe the pointed, fleshy, proboscis-like snout, which is characteristic of the genus Macrognathus.

3. 3

   Dorsal Fin Spines

   Count the series of isolated, sharp spines along the anterior part of the dorsal fin, a key feature distinguishing spiny eels from true eels.

4. 4

   Coloration and Pattern

   Note the irregular dark blotches or bars on a lighter background, and the presence of ocelli along the dorsal fin base, which can vary among individuals.

Explore Spiny Eel