Water temp is not a factor for white sharks. They have a very wide range from the 40s up to 80 deg, which is more of a range than most shark species.
The Feds protecting both the whites and their preferred meal the seals has caused this problem.
Remember- "Today's solution, is tomorrow's problem." -Tom
Yep, one up in northern Bay of Fundy right now over 15 feet/2000+ lbs ...several around Nova Scotia and one as far North as Havre-aux-Maisons ...and those are just the ones w/”sat” tags!
https://www.ocearch.org/tracker/?list
That's because great white sharks have a special circulatory system common to several types of large fish. It's a countercurrent system which brings cold seawater chilled by the gills backwards in blood vessels, toward the tail. The muscular thrashing movements of the tail has warmed the blood in vessels back there, which travels forward toward the head in blood vessels which run parallel and close to those bringing the cold water toward the tail. There is a heat exchange, so that the blood is pre-warmed before it hits the tail and thus does not chill the tail muscles before their thrashing motion warms it up. This results in far greater efficiency of the tail muscles, so these large fish can propel themselves swiftly through even cold water, with full muscle efficiency.
