This might not mean much, as I had a sample size of 2, but I will say it anyways bacause I thought it was interesting...When I lived in South Dakota I had a couple 4-5 inch "wild" yellow perch in my 40 gallon fish tank along with some bluegill. The only thing i would put in the tank was fish food pellets I had bought at Wal-Mart. The BLG took too the food...probably within a day, and had been in the tank for a good 6 months before the perch were introduced. It took the perch a couple weeks to get hungry enough, but they started to activily feed at the top of the tank just like the BLG, however, they were never really all that aggressive when feeding, nor did they eat much...but they still did it...
