For years, legendary tales from Scotland and Western Alaska described large animals or monsters thought to live in Loch Ness and Lake Iliamna.
Two exceptionally large Arctic sharks ply northern waters: the Greenland shark and Pacific sleeper shark. During the last few years, scientists have documented Greenland sharks using the St. Lawrence Seaway, lending further credence to the hypothesis that some sharks can survive in freshwater. Bull sharks are also known to swim in freshwater, but that species needs warmer waters.
The idea of sharks possibly using Loch Ness is not new; that’s long been one of the hypotheses explaining the Loch Ness Monster. But until now, nobody had suggested sleeper sharks perhaps because they’re secretive and so rarely seen.