As a sibling comment notes most sharks cannot live long in freshwater, and moreover this is soecifically true of Greenland sharks, though they do sometimes spend time in brackish river mouth environments, so, unless it developed the weird behavior of migrating quickly up the relevant underground river to make a quick appearance and then inmediately rushing back down the river to the ocean, that’s one answer we can be fairly certain is wrong.
replyThere are a few sharks that can live in freshwater, but they tend to inhabit warmer oceans.f_
Totally wild factoid: Bull sharks have been caught in tributaries of the Mississippi River in Illinois. (Back before they built all the dams)
replyYeah, bull sharks are the most common and wide-ranging of the sharks that are adapted to survive in a wide range of salinity levels.
replyBull sharks are often found in rivers tens of kilometres from the ocean in Queensland.
replyThat's the kind of rare and highly luck based curiosity they ought to give you a plaque for. "From this shore in 1973 local angler..." Slap it on the same sign post as the flood high water markers they put up.
replyThat's too bad. I thought he was on to something.
replyHe is likely wrong (most sharks cannot live long in fresh water). But given the show, he has to conclude it is a fish of some sort, and it is not going to be 10k arctic char in a dinosaur suit.
replydeleted
replyDoubt a shark could survive in freshwater. They’re very tuned to salinity
replyBull sharks can, but they're the famous exception to this. Sometimes they swim up a river and nip somebody.
replyThe most likely explanation for the Loch Ness Monster, of course, is that it's entirely made up and didn't require an actual sighting or a real physical phenomenon, ever, to trigger people's imaginations.
reply