Sigh...
At first I thought, the blue (let's cal it blue now hehe) was selected from different batches of young crays and bred together to produce more, but now I know why...
dom, I guess they must be
cherax quadrinatus injected with the die so they turn blue right? Coz like crazymouse said, the cray does not seem to fit in anywhere, bocs there is no blue quad even in US market...just the alleni and destructor as well as the other types like marron have blue strains...quad is originally brown with the males having red tips on their claws...
........