The red swamp crayfish Procambarus clarkii is native to northeastern Mexico and the south-central USA, and it has expanded its distribution worldwide and negatively impacted the ecosystems in the invaded regions. The dynamics of the P. clarkii populations ...
I didn't know cyclic dimorphism of crayfish but this paper explained it very well.
In short reproductive male and female has larger chelae and non-reproductive smaller.
Also reproductive male has hooks on pereiopods.
And based on this paper it seemed that my P.clarkii pair was in form 1(reproductive form), so I put them together and it succeeded!
They are mating peacefully with no injuries!