Hello, I took this pics in a small mangrove swamp on Ilha Grande, about 200 km South of Rio de Janeiro. There I spotted a couple of Tetraodon, not able to specify the species, though... I have more pics, if you want.
Cheers
Maurizio
One more thing: I'm not at all sure this is indeed the F8P environment, and even less about BBG, but anyhow, I though it was worth sharing one of the pics, showing a mangrove swamp.