With water flowing partly over it, you can't see how brilliantly this fellow is colored--wine-red markings on olive green, with bright blue (tropical-fish-blue) tubercles on the big nippers. I've seen this color pattern only once before--again with crayfish right after a flash flood, working their way upstream (that time in the gully system, and I didn't have a very good camera.)
Alas for the fish, Westbrook dried up today--not only no flow, but only a few puddles, getting smaller by the hour. Crayfish can live in holes underground and stay moist; fish aren't so lucky.