Is it bad to interbreed crayfish? I ask this because I have been breeding blue Alleni crayfish for about a year. How I started of was 1 male cray from a local fish store and 13 baby crays from a different breeder. When those 13 grew up they bread with each other. I have never seen any deformities? I have 3 males and 2 females. I have a batch of females coming in from another breeder to mix the blood line up. Because I don't want to use the female juvis to breed in the same line again. Is there anything else that can happen besides deformities?