Not shure what fruit flies look for in a wine. Just that they have good taste in it:-) I just found it interesting that they did not like the store bought stuff, while swarming my home made stuff. I had to agree with their assesment!
We "lost" a bowl of fruit in the kitchen, the fruit flies found it, so needless to say we have plenty of fruit flies to experament with!
If you have a glass full of wine then the flies are easy to fish out. But after they die and sink or you drink it down to the lower quarter they are hard to get! How much protein per fly is it? My freezer is getting down on meat, maybe I will start trapping fruit flies!!