The white shark dwells in cold water and, for that reason must maintain a warm body to stay active. Individuals of this species may spit humans out because they are low in nutritional value in comparison to seals and seal lions. The fat making up the insulating coat of seals has twice the energy content of human muscle. The tiger and bull sharks are inhabitants of warm water and on occasion eat humans. It is best to avoid swimming and diving near concentrations of prey of these species.
White sharks are most abundant near colonies of seals and sea lions.
Tiger sharks are abundant near islands with large populations of sea birds. Comments on means for avoidance or deterrence of white shark attacks on humans. Klimley, A.P. 1974. An inquiry into the causes of shark attacks. You can contact Dr. George Burgess of the Florida Museum of Natural History, who keeps statistics on the number and locations of shark attacks in the International Shark Attack File.