Males tend to be more brightly colored than women, although the latter is needed to make sure peace and equilibrium as part of your group of danios. Whilst there are actually now various regulations preserving these rare fish from even more threats, many have not still recovered in the wild. https://www.diigo.com/item/note/9tt3x/b27r?k=2b3f4d10222e0e076abad039c47f0ae0