Pond Boss Forums GENERAL QUESTIONS Wildlife Management Is he good or bad?

First look what species are listed for Ohio and narrow it down to a few likely genera and species.
http://iz.carnegiemnh.org/crayfish/country_pages/state_pages/ohio.htm
As you will see identifying crayfish can get a little complicated if you need a species name. I think you will need to pull off the 1st pleopods between the last pair of legs and get a close look at the shape of the pleopods
Focus on figuring which genus you have; most likely Cambarus or Orconectes maybe Procambarus. I'm guessing you MAYBE have a Cambarus robustus or Cambarus diogenes??
Then see info in these links which may help you figure out what you have.
http://iz.carnegiemnh.org/crayfish/Keys/SectionII.htm
Cambarus section: http://iz.carnegiemnh.org/crayfish/Keys/cambarus.htm
http://www.ontarionature.org/discover/resources/PDFs/id_guides/crayfish_apr08.pdf