Right away you should realize this took ridiculous timing and effort to get.
Every now and then along the rivers, I noticed a fish doing this. After a LOT of trying, I got one in focus.
Once I saw it frozen still like this, I realized they were eating the leaves. You can see the ones half-eaten already.
I don't know how to spell it, but I've been told this is something like a "Pira putanga".
Refugio Da Ilha Region of Southern Pantanal, Brasil
Sept 2009