Attributes / relations provided by
♦ ¹Food of Northwest Atlantic Fishes and Two Common Species of Squid, Ray E. Bowman, Charles E. Stillwell, William L. Michaels, and Marvin D. Grosslein, NOAA Technical Memorandum NMFS-NE-155 (2000)
♦ ²THE DIET OF HARBOUR PORPOISE (PHOCOENA PHOCOENA) IN THE NORTHEAST ATLANTIC, M. B. SANTOS & G. J. PIERCE, Oceanography and Marine Biology: an Annual Review 2003, 41, 355–390