@croydon - There has been a lot of legal fuss over those fish. They are only sold in the United States and even some states there won't sell them, because of the genetically modified aspect.
And if you look at what happened when they showed that someone had created that fluorescent rabbit, there was a huge outcry about it.
One day people might start taking it for granted, but at the moment, there are (I think legitimate) fears that if people relax about one bit of genetic engineering, they will try to push through riskier and riskier changes.
It can be a slippery slope.