How to Identify Round Goby

To identify Round Goby (Neogobius melanostomus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Mottled brown, gray, and black patterns on the dorsal side, fading to a lighter, often yellowish-white belly. Distinctive black spot on the anterior dorsal fin.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Large head and prominent eyes set high on the head., Fused pelvic fins forming a single, suction cup-like disc., A single, prominent black spot on the anterior dorsal fin., Thick, fleshy lips., Two dorsal fins, the first spiny and the second soft-rayed.

Dorsal fin

Two dorsal fins; the first is spiny (6-7 spines), and the second is soft-rayed (13-18 rays). The first dorsal fin typically has a prominent black spot at its posterior end.

Tail fin

Rounded caudal fin.

Pectoral fin

Large, fan-like pectoral fins.

Distinctive fins

Pelvic fins are fused into a single, suction cup-like disc, characteristic of gobies.

Identification Tips

1. 1

   Pelvic Fin

   Look for the single, fused pelvic fin that forms a suction cup. This is a key characteristic of gobies and distinguishes them from many other bottom-dwelling fish.

2. 2

   Dorsal Fin Spot

   Identify the prominent black spot on the posterior end of the first dorsal fin. This is a reliable distinguishing feature for the Round Goby.

3. 3

   Head and Eyes

   Note the large head and eyes that are set high on the head, giving it a somewhat 'frog-like' appearance.

4. 4

   Body Coloration

   Observe the mottled brown, gray, and black patterns on the body, which provide camouflage against rocky or sandy bottoms.

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