I think it could be a net or something similar indeed. What I find suspicious about this video is that, whether deliberately or not, but the camera avoids to show us the 'head' of the supposed 'creature' or it's alleged 'movement' against the water flow - to make such conclusion we need to watch the shore simultaneously which we can't in this case. Otherwise this 'thing' could be simply attached to something else (a boat?) with a rope and just be floating in the water without actually moving forward.
Just some thoughts, it could be a creature too, who knows. FWIW
That is something that i find weird, just like the mirage over China and that is, in this day and age, with cameras and phones everywhere these clips are always less that 10 seconds short...
I think i would want to capture as much of it as i can minutes of it, specially if i find it Weird, no?
Personally i think it looks like an animal because it is moving on a wave pattern and the bote is moving straight. But I've never lived around water, so i wouldn't know..