The spiny dogfish is one of the most abundant demersal shark species in Atlantic Canada and may be the most abundant shark species worldwide. This shark is a major predator on several commercially significant species such as herring, Atlantic mackerel and squid. As such, they have long been considered a nuisance by fishermen because they interfere with fishing operations, as they cause damage to fishing gear and are regularly caught as bycatch in several fisheries.
The spiny dogfish is a small schooling shark that forms groups of hundreds, even thousands, of individuals of the same sex and size. It is grey or brownish on top and pale grey or white on its bottom side with sporadic white spots on the top and sides of its body.