Used whole or in pieces, shedder crabs make killer bait for drum, flounder, trout and stripers. Shedders are blue crabs about to shed their shells. In this pre-molt period, the old shell peels off, revealing the juice-laden “new” crab within. Hence their other moniker: “peelers.” You can buy them, but savvy anglers catch their own. Look for these key signs to determine if a crab is ready to shed and suitable for bait.