When I was a kid there was an old guy in town that something happened to his mother and he ended up going to sea with his dad when he was nine years old. There was no Panama canal then. He said the sailing ships could take on fresh water 200 miles out off of the Amazon river. That is some current. He was a pretty neat old guy. Had some great stories.
I like stories like this too. 200 hundred miles out, amazing. That has to have some effect on fishing?