I just thaw them out, then let my eel eat maybe 5-10 pieces out of my hand, then drop a small handfull near my Lima cats, and then scatter the rest around the tank for everything else to eat. Imo, there's really no reason to remove the shells or tail, unless you are feeding small/young fish. The only parts I ever remove are the exceptionally sharp parts (and I only find those on freeze-dried shrimp, which I usually don't use anyway).