How to Identify Black Goby

To identify Black Goby (Gobius niger), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Generally dark brown to black, often mottled with darker spots or bands. Males become intensely black with iridescent blue or green spots on the fins during breeding season. Females are typically lighter brown. The first dorsal fin often has a distinct black spot on its anterior margin.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Two dorsal fins, the first with 6-7 spines and the second with 1 spine and 12-15 soft rays., Anal fin with 1 spine and 10-13 soft rays., Pelvic fins fused into a suction cup-like disc., Large head with a relatively large mouth., Scales present on the head, extending forward to the eyes., A prominent black spot on the anterior part of the first dorsal fin.

Dorsal fin

Two dorsal fins; the first is spiny (D1 VI-VII), the second is soft-rayed (D2 I/12-15). The first dorsal fin is higher than the second.

Tail fin

Rounded caudal fin.

Pectoral fin

Large and rounded, typically with 17-20 rays.

Distinctive fins

Pelvic fins are fused into a single, anteriorly concave, adhesive disc, characteristic of gobies.

Identification Tips

1. 1

   Coloration

   Look for the generally dark brown to black body, often mottled. Breeding males are intensely black.

2. 2

   Dorsal Fin Spot

   A key identifier is the prominent black spot on the anterior part of the first dorsal fin.

3. 3

   Head Scales

   Scales extend forward on the head to the level of the eyes, which helps distinguish it from some other goby species.

4. 4

   Pelvic Fin

   The fused, suction-cup like pelvic fin is characteristic of gobies.

5. 5

   Size

   Can reach up to 18 cm (7 inches) in length, making it one of the larger goby species in its range.

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