I have a buddy that dives on the local lakes, he says you can sit on the bottom and click a couple of rocks together and smallmouth will show up to check it out.Thanks a lot Johnnybass . A couple of more things about my experiences with crayfish . I had a job that took me along the banks of the California Delta many moons ago and one day at lunch I looking in the shallows and saw a small 1 1/2" crayfish on the water's edge . I managed to scoop it up and take it home for observation . After about a weeks time living a small goldfish bowl I looked in the bowl and saw no crayfish just the empty shell . I thought it had died at first but when I looked more closely I saw a completely transparent little softshell crayfish that was now the same color as a clear "Smoke " soft plastic bait . The next day when I looked it was now a clear olive color and got darker day by day as the new shell hardened until it was a green pumpkin color . This crayfish was a "Louisianna Swamp craw that turn red as adults but I am sure the other crayfish species go thru a similar color process when molting.
Another thing I witnessed was when I brought a couple of crayfish home and put them in a plastic tub in my garage . At the time beads and rattles were a new big thing (and I was night fishing a lot) that were supposed to mimic clicking sounds crayfish used to communicate with one another . I turned the lights out in the garage at night and sat in a chair while I listened for what these clicking noises actually sounded like . Sure enough I started hearing clicking noises coming from the tub . With the lights on sitting there were no clicking noises and I am sure it was no coincidence that with the lights on the crayfish would sit tight and not move at all ? I put a piece of red plastic over a shop light and suspended it over the tub hoping to see my guests talking when I turned the big light off . After a short time the clicking resumed under the dim red light . It turns out the clicking was coming from the crayfishes claws as they crawled across the bottom contacting rocks feeling their way with their claws while searching for food . I was thinking leading with their claws was probably for defensive purposes in case they encounter another crayfish unhappy with the encroachment . As a test I removed the rocks and with lights out never heard another clicking sound coming from the tub . I guess my thinking is when a bass hears clicking his first thought is a crayfish is out of cover crawling around or could be a molting on the bottom and could make a potential meal . It's kind of funny we hear things about bass fishing we take as being gospel but with a little investigation it is easy to suspect what we have heard it not correct .