Quote Originally Posted by badflash
ID of crays are a tricky business and best left to experts. To properly ID good close up pics are needed of the back, claws and male reproductive organs. This gets a little tricky and usually takes two people. One to hold the cray and expose the male parts with a tooth pic, and one to take the picture.

I belong to a crayfish forum called bluecrayfish.com. One of the members is a true crayfish expert and armed with such pictures, can ID just about anything.
These are going to just be to learn a little bit bout crays with until I can get a Marmorkreb. I figured if they were cheap, it wouldn't hurt to give them a try ..... I'll probably grind them up for fish food when I get a Marmorkreb and it has babies

I wouldn't know how to expose the male organ of a crayfish, so I guess I'll pass on that