Mmmmmmm, crabs

My family and I vacation in Hilton Head, South Carolina every couple of years.  It’s your typical family vacation with sun, and sand, and a whole lot of doing nothing.  This year, while visiting the pier at Harbor Town, we saw a couple of guys watching a couple of thin ropes trailing down into the water.  When I asked what they were doing they said they were crabbing, and opened a cooler to show me half a dozen or so large blue crabs.  Mind . . .  blown!  You mean I can go out on a public pier and catch my own seafood dinner??? That night I went back to the house and started Googling everything I could find about