Thats a good question that I'd like to know a bit more about too. It reminds me of other fishing related behavior that I have a question on, let me explain.
We've seen posts here and heard how fish may remember not to bite a bait/food that they have been caught on before. An incident this week had me thinking on that a good bit. In my pond the bass are now a little over 1 year old. I began fishing for the bream this past week, it was finally time (woot). I hooked a little 5-6" coppernose bream, which was immediately hit by a bass, it was out a little ways and it put up a good fight, the bass that is. So I get it to shore and the only thing that has the bass hooked is of course the fins of the bream. I removed the bream from the bass, checked them both out. (Now normally I through out every bream I catch, but I felt this one deserved a second chance after such an ordeal

)
Anyways I got to thinking after releasing this bass, will it ever eat another bream, or see one and have a flashback of this experience? It was a funny thought on one hand and then not so funny on the other.