Crayfish anyone?(gwynns falls)

Well we decided to go fishing at our other spot downstream.
We get there, and can't take one step without having 5+ crayfish dart out of your foot path.
If I were to take a census of their population in the water at the moment, (assuming I knew how) I'd estimate it in the 1 mile stretch I know, at about 50,000 ish.(adults 1+ inches in length.)
http://i242.photobucket.com/albums/f...a/P7180449.jpg
http://i242.photobucket.com/albums/f...a/P7180457.jpg
Did manage to get another one of those "god awful" creek chubs.:rolleyes:
http://i242.photobucket.com/albums/f...a/P7180450.jpg