How about cormorants that hit the pond, and were gone before you knew it?
How about if a few catfish(or another stray predator fish) got in there and started wiping out that smaller size BG early on? I think I would fish with a small BG and see what you come up with.
Never seen a cormorant near our area. The shocking didnt show any signs of any unwanted predator fish, nor has my 2 years of fishing.
