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
aka Cycling Guru and the Ich Slayer
*glares at Terry and QTOFFER*
Card carrying member of FTAS & GCAS.