Thanks everyone,your right big Dave,100 per cent Hystrix,ive had the parents longer than the Marbles,they live alone so theres no question,both the male and female have very bold markings but this pup is something else,she was the only pup the first time albeit a big one,12cm disc,the second time she had two slightly smaller ones,one of each sex,unfortunately they were slightly premature with large yolk sacs attached,these both burst and sadly i lost them,i was devastated,Hystrix rays for me are the nicest pups,very cute.The male copulated with the female just before they were ready,i feel that that was the cause.I have pictures somewhere of the dead fish,again the markings were so strong,it hurts to look at them,however if i can hunt them out some time i will show them to you,perhaps when she produces again and it doesnt feel as painful.