Tobago has an interesting underwater world. Surprisingly sponges attracted my attention. They have a weird and an ambiguous classification (the one that we were given at the expedition) but they are colourful and more abundant than anything else. Guess mostly because corals are in a terrible condition.
If you are looking for interesting things like invertebrates or even small colourful fish you should definitely look inside barrel sponges. Barrel sponges can be tiny or even the size of a car
Most of them we would classify as encrusting sponges. At least for survey purposes. This is just some representatives of sponges. I believe I didn't take pictures of even a tenth part of species around the island.