Who would win in a fight? Shark or Giant Octopus?

The spiny dogfish, spurdog, mud shark, or piked dogfish, Squalus acanthias, is one of the best known of the dogfish, members of the family Squalidae in the order Squaliformes. While these common names may apply to several species, Squalus acanthias is readily distinguished by having two spines (one Category: wikt - :anterior|anterior to each dorsal fin) and its lack of an anal fin. It is found in shallow waters and offshore in most parts of the world, especially in temperate waters.

The North Pacific Giant Octopus (Enteroctopus dofleini) is a large cephalopod belonging to the genus Enteroctopus. It can be found in the coastal North Pacific, usually at a depth of around 65 meters (215 ft). It can, however, live in much shallower or much deeper waters. It is arguably the largest octopus species, based on a scientific record of a 71 kg (156.5 lb) individual weighed live.Cosgrove, J.A. 1987. Aspects of the Natural History of Octopus dofleini, the Giant Pacific Octopus. M.Sc. Thesis. Department of Biology, University of Victoria (Canada), 101 pp. The alternative contender is the Seven-arm Octopus based on a 61 kg (134 lb) carcass estimated to have a live mass of 75 kg (165 lb).O'Shea, S. 2004. The giant octopus Haliphron atlanticus (Mollusca : Octopoda) in New Zealand waters. New Zealand Journal of Zoology 31(1): 7-13.O'Shea, S. 2002. Haliphron atlanticus ? a giant gelatinous octopus. Biodiversity Update 5: 1. However, there are a number of questionable size records that would suggest E. dofleini is the largest of all octopus species by a considerable margin.Norman, M. 2000. Cephalopods: A World Guide. Hackenheim, ConchBooks, p. 214.