This washed up on the beach. It’s very heavy but seems to barely float. It’s about 3-4 feet long and looks like fiberglass on the outside, but not completely sure.
A: It is an outrigger for trolling. You attach a long line to it, carrying it away from the side of the boat so you can put out 2 long lines at once. Used for tuna and swordfish in the gulf stream.