I've seen pictures of people wreck fishing for Jewfish in florida, huge groupers with 2,3 even 5 hooks in their mouths, they rush back into the ship wreck and the line is cut.
It actually will rust a little, but it will come lose and fall out through its normal swimming / eating habit.
ALSO... Flatten the barb. Its what I do, makes it a little harder to land fish, you lose some now and then, but when you get used to how you have to handle the fish you won't have any problems