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Hajra, in the first pic I even can't see what TYPE of animal it is (yes, MAYBE a worm-type animal).
In the second pic it COULD be the fin of a fish.
Sorry .....this is more a mystery puzzle.
Better buy a better camera or ask someone else to make the pic (sorry, only joking, na lang !)

 

This is for sure a triggerfish.
At first glance I thought it is a Ocean Triggerfish, looking to its shape, which fish can become as big as 65 cm. It's territory is a.o. Florida and Bermuda, so that could fit with your location where you made the pic.
But after a closer look I more believe it is a BlueTriggerfish (55 cm long if fully grown) but not known to be around the Bahamas.

Official name for Ocean Triggerfish: Canthidermis sufflamen
Official name for Blue Triggerfish: Pseudobalistes fuscus.