What is the point to using Lava traps? Is there a rare lobster or crab that can only be caught with them? If there is a use for these traps, then are they coded properly? Nowhere else do crab traps give the message that there are no fish here. This is a fishing message. Once the lava traps are in place, are they still working despite the no fish message? I know if I leave them in place, eventually they will be pulled under the waves, however I never get a "bob" and a crab.