Gobiusculus flavescens (Fabricius, 1779)

Taxonomic Classification and Size

Gobiusculus flavescens, previously classified as Pomatoschistus flavescens, are small, slender gobies that reach a maximum length of 6 centimeters.

Eye Position

They differ from other gobies because their eyes are positioned laterally, on the sides of the head, rather than dorsally, on top of the head.

Fin Spot Characteristics

The species has a black spot at the base of the tail fin; males of the species have a second, smaller black spot beneath the pectoral fins.

Baseline Body Coloration

Their body color ranges from reddish to greenish brown, with paler coloring on the undersides and dark reticulated patterns on the dorsal side.

Dorsal Markings

Four light saddle-shaped markings run along the dorsal side from the head to the end of the second dorsal fin.

Lateral Markings

A series of bluish markings appear along the midline of the fish's sides.

Breeding Season Coloration

During the breeding season, these bluish markings become extremely bright in males.

Habitat Preferences

This species favors habitats with abundant weed growth. It can be found on overgrown structures, and in beds of Laminaria or Zostera.

Depth Range

It inhabits intertidal pools and shallow water, and occurs down to a depth of 20 meters.