Amazon river creature "torments" kayaker

[pianopraze]

I think it’s several things going on at once.

probababy a big run of fish. There are several animals species going after them at once.

In this example: seals, larger fish, sharks, whales, birds, etc… all going after a run of smaller fish.  I think we are seeing Amazon equivalent and kayaker was in the middle of it:

[Video: https://www.youtube.com/watch?v=6zOarcL1BSc]