Pearls and rock crabs....
 

Don't know if I'm caught in a bug but I am suppose to recover two pearls from rock crabs. However, I've killed about 30 and there was no quest update or even a message that it was being searched for. Also, the quest light from the sky points to tortuga where as far as I can tell (after killing everything on the island.... twice) ther are no rock crabs? Please let me know if anyone knows what step I am missing.

Well little did I know there was one path I missed through the rats nest is another spot with rock crabs and big alligators and mutant venus fly trap plants lol. So if anyone get's stuck on this step there you go... find rats nest through the graveyard then go through there to the misty mire.. :)

I was only able to get the pearls from the rock crabs on tortuga, where the ray of light takes you. For this quest you really need to be right where the ray of light is.