Gunnel

Gunnel (Centronotus), a genus of coast fishes in the Blenny family, but with more elongate eel-like form than the true blennies. The British species (C. gunnellus), the spotted gunnel or butterfish, is common on British coasts, lurking under stones in tidal pools. The colour is deep olive, with a dorsal row of black spots surrounded by white rings; the usual length is about 6 inches; the skin is thickly coated with a mucous secretion. It is seldom used except for bait.