How to Identify Firefish Goby

To identify Firefish Goby (Nemateleotris magnifica), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

The anterior half of the body is typically white to yellowish-white, transitioning to a vibrant red or orange towards the posterior half, including the caudal fin. The dorsal fin is often elongated and can be tipped with black or purple. The pelvic and anal fins are usually red or orange.

Scale type

cycloid

Mouth position

superior

Distinctive features

Elongated first dorsal fin ray, often extending significantly beyond the rest of the fin., Bicolor body coloration (white/yellow anterior, red/orange posterior)., Small, upturned mouth.

Dorsal fin

Two dorsal fins; the first dorsal fin has 6 spines, with the first spine being greatly elongated. The second dorsal fin has 1 spine and 26-32 soft rays.

Tail fin

Forked caudal fin, typically red or orange.

Pectoral fin

Pectoral fins are clear to slightly yellowish, with 19-21 rays.

Distinctive fins

The greatly elongated first dorsal spine is a key identifying feature, often used for display or as a sensory organ.

Identification Tips

1. 1

   Coloration

   Look for the distinct white/yellow front half and bright red/orange rear half of the body. This bicolor pattern is very characteristic.

2. 2

   Dorsal Fin

   Observe the first dorsal fin; the first ray is notably elongated and often stands erect, especially when the fish is alert.

3. 3

   Behavior

   They typically hover in the water column, facing into the current, and will dart head-first into a crevice or hole when threatened.

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