How to Identify Amur Goby

To identify Amur Goby (Rhinogobius brunneus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Highly variable, typically mottled brown, grey, and olive green, with darker blotches and spots that aid in camouflage. Males often display more intense coloration, especially during breeding, with iridescent blue or red markings on fins and body. Underside is usually lighter.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Fused pelvic fins forming a disc-like suction cup, Two distinct dorsal fins, Large head with prominent eyes, Cryptic coloration for camouflage

Dorsal fin

Two dorsal fins; the first dorsal fin has 6-7 spines, and the second dorsal fin has 1 spine and 8-10 soft rays. The first dorsal fin in males can be elongated.

Tail fin

Rounded to slightly emarginate caudal fin.

Pectoral fin

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

Distinctive fins

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

Identification Tips

1. 1

   Pelvic Fins

   Look for the distinctive fused pelvic fins that form a suction cup on the underside, a key characteristic of gobies.

2. 2

   Dorsal Fins

   Observe the two separate dorsal fins; the first is spiny, and the second is soft-rayed. Males may have an elongated first dorsal fin.

3. 3

   Coloration and Pattern

   Note the mottled brown, grey, and olive coloration with irregular dark blotches, providing excellent camouflage against rocky or gravelly bottoms.

4. 4

   Head Shape

   The head is relatively large and broad compared to the body, with prominent, dorsally-placed eyes.

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