[2] This fish prefers to inhabit areas with plenty of weed growth, being found on overgrown structures and in beds of Laminaria or Zostera.

They are found in intertidal pools and shallow water to a depth of 20 m. Pomatoschistus flavescens are small, slender gobies, reaching up to 6 cm in length.

They are reddish to greenish brown in colour, paler on the undersides with dark reticulations dorsally.

The male becomes territorial and defend a nest formed by a natural cavity such as an empty mussel shell or a folded kelp leaf.

After a period of growth in the summer, the juvenile fish move into deeper water to spend the winter.