here are my favorite y-linked topsword guys:
one of them zoomed:
The strain was created by one single topsword male and one japan blue wild female.
The topsword-Genes are certainly y-linked, the greenish snake skin pattern on the peduncle is x-linked. Here you can look closer:
In the last litter I found that female:
I was very amazed. Perhaps this little spot in her caudal notices crossed topsword genes(from Y to X). On the other hand it could be possible that this female is homozygote for the snake skin pattern. Both would be great!
Last week she dropped out enough fry for raising up.