I I have just discovered that I have GSF in my pond. They are 2-4" now. About a month ago I noticed I had some very aggressive fish feeding right next to my feeder and they have doubled in size since then. I caught 2 and took to my fish guy Friday and confirmed they were a bred down hybrid BG. Don't have a clue on how they got in my pond but so far only notice a few of them. He gave me a minnow trap so hopefully I can catch them. I have lots of big BG (8+") and LMB so hopefully they can keep them in check. Any other ideas on getting rid of them?