Northern GA Coast

Hello! I work at a marine science center on the coast of GA and had a guest bring in a photo of something they saw on their beach walk this morning. I asked all of my colleagues what they thought it might be, but we couldn’t come to any solid conclusions. It looks like flesh of an animal that might’ve gotten caught up in a propellor. It doesn’t look like there is any hair present, so we ruled out it being from a whale. You can see fin-like structures and what seems to be fat tissue. Didn’t know if anyone had any idea what this could be!