Frillfin goby Frillfin goby The frillfin goby ("Bathygobius soporator") is a species of marine fish in the genus "Bathygobius". The frillfin goby is a usually dark colored goby with mottled coloring of black, gray, and tan, but body color is variable between habitats. It has a thin, gray-green first dorsal fin and a trailing second dorsal fin of the same color. Its brown eyes are proportionally large. Its cheeks are large. The caudal, anal, pectoral, and pelvic fins are a transparent yellow. The pelvic fins of the frillfin goby has one spine and five rays that are close together. The frillfin goby
Sand goby rounded. In males, there is a conspicuous dark spot on the anterior dorsal fin and in both sexes there is a black patch on the caudal peduncle. The general colour is sandy brown with indistinct dark blotches and reticulations on the dorsal surface and dark striations on the pale fins. The colour of the male darkens during the breeding season and his fins become more coloured. The average size is about . The sand goby normally lives at greater depths than the common goby. It feeds on small invertebrates living on the seabed especially amphipods. It is well camouflaged and