Does anyone here know how to tell the difference between a male and a female giant danio? My dad currently owns 10 and was told that you can identify male from female by coloured lines that run the length of their bodies and into their tails. We've had a close look, but all 10 of ours seem to have lines running the length of their bodies and into their tails. Is it likely we have all one gender, or is there another way to tell the difference?