Personally I always thought crawlers were good for the forest by aerating the topsoil.  I wonder what the negatives are. I guess there's always google...

Did you guys ever read the story of the Lindner boys using live tiger salamanders for walleyes?  This was a hot bait back in the 90's or so.  Let 'em crawl on the bottom and bring 'em up for air every few minutes.  10 pounders love them.