Couple of comments as this type of post has been going around the forums for a while now.
They do NOT glow in the dark. The flouresce in blacklite. If you don't have a blacklite, you won't see them in the dark.
They are not completely sterile. Best they can do is 90% sterility which is not enough
IMHO.
They were originally modified for biological study. Then someone got the bright (heh) idea to market them to layfolk. Personally I don't have a prob with using them for study; I do think they will wind up in our waterways if they are sold in fish stores tho, and that makes me uncomfortable.
More info on the scientific aspect here:
http://www.zygogen.com/zebrafish.asp
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