I have a male and a female crayfish in a tank together. They were in a 5 gallon, and the male ripped off one of the female's claws off. Does that always mean that they mated if the male takes off the female's claw?
No, crays even a male and a female will get into some fights. They are territoral even being opposite genders. I wouldnt have a male and a female together in the same tank at all. Really I wouldnt have two crays of any kind in a tank together.
I don't have experience with breeding them yet...I've only been keeping them for over a month. I cant say a lot other then what I have learned. http://www.aquaticcommunity.com/inv/breedingcrayfish.php
I have used that site in the past to research things before. I find their info pretty good and trusting. But thats just IMO. Best of Luck with breeding them. If you get a success post some pictures lol.
The male will flip the female over on her back and climb on top. the chances that your crayfish mated in a 5 gallon are slim to none. and generally, they will not loose limbs while mating....they were fighting.