We also used to see vast schools of spiny dogfish sharks in the San Juan Islands. (sea-quest-kayak.com)
In addition to encountering over 50 percent of all the other tagged sand tiger sharks on the East Coast, the sand tigers came in contact with Atlantic sturgeons, white sharks, sand bar and spiny dogfish sharks, and even southern species like the lemon shark and bull shark. (sciencedaily.com)
He discovered it in dogfish sharks in 1993 and synthesized it in 1995 in a process that does not involve use of any natural shark tissue. (gumc.georgetown.edu)