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I think it depends which color fish you are talking about - I don't think they use the same gene to get the different colors. Not sure, but I thought I read that somewhere.
Hi all, as someone who works in the Danio research field, I can testify that these guys will breed. It is an gene insertion event, these guys express YFP, GFP or RFP which are fluorescent proteins originally found in a species of jellyfish. Danios are notorious egg eaters so you need to have a mesh for the eggs to fall through and collect them fast. zfin.org can supply some of the techniques for breeding. I must admit that these guys have a bit more embryonic death than my normal strains. You will also notice that the offspring will not all look exactly as bright as the adults. Sometimes the gene will get transferred completely, sometimes not... Hope this helps and good luck breeding.
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