Thanks hge54. During this boat trip someone lost his (expensive) sunglasses and he was seriously considering to go into the water to look for his sunglasses... The muddy river was full of crocodiles and some of these bulls!
I have seen a lot of sharks underwater, including Tigers and Great Whites, and never felt endangered, but sharks on the surface are much more dangerous. This would scare the hell out of me, especially in that murky water. I trust you were in a boat. V