How to Identify Tubenose Goby

To identify Tubenose Goby (Proterorhinus semilunaris), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Variable, typically mottled brown, grey, or olive-green with darker blotches and saddles along the back and flanks, providing excellent camouflage. The belly is usually lighter. Fins are often speckled or banded.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Prominent tubular anterior nostrils that extend beyond the upper lip, resembling small tubes., Two dorsal fins, the first with spines and the second with soft rays., Pelvic fins fused into a single, suction-cup-like disc., A distinct dark spot or ocellus on the upper posterior corner of the first dorsal fin., Lateral line scales typically number 58-70.

Dorsal fin

Two dorsal fins; D1 VI-VIII (spines), D2 I/15-18 (spine/soft rays). The first dorsal fin is typically lower than the second.

Tail fin

Rounded to slightly emarginate caudal fin.

Pectoral fin

Large, fan-like pectoral fins with 16-19 rays.

Distinctive fins

Pelvic fins are fused into a single, adhesive disc, characteristic of gobies, used for clinging to substrates.

Identification Tips

1. 1

   Nostrils

   Look for the most distinguishing feature: the tubular anterior nostrils that protrude noticeably beyond the upper lip. This is unique among gobies in its introduced range.

2. 2

   Dorsal Fin Spot

   Observe the first dorsal fin for a prominent dark spot (ocellus) on its posterior upper corner. This spot is often ringed with a lighter color.

3. 3

   Body Pattern

   Note the mottled brown/grey/olive coloration with irregular dark blotches and saddles, which helps it blend into its environment.

4. 4

   Pelvic Fin

   Confirm the presence of a fused, suction-cup-like pelvic fin, characteristic of all gobies.

5. 5

   Size

   Adults typically range from 6-11 cm (2.4-4.3 inches) in total length, with a maximum recorded size of about 15 cm (5.9 inches).

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