Right: Photograph of a dogfish Scyliorhinus
canicula (L.) by Christine Ryan.
There are two related species - this, the smaller variety, is also known
as a rough hound or rock salmon. Commonly found lying still along the bottom,
close to the edge of the kelp line, it will often remain motionless allowing
divers to get quite a good look. This species is characterised by the fact that the
nostrils are connected to the mouth by a clear groove.