I prepared Bluegill fillets different ways. Simply boiling them is salted water for 1-2 minutes and then draining and chilling the fillets produced a Shrimp like meal great with cocktail sauce.
All of our perch and pan fish like Bluegills, Rock Bass and Crappie were filleted and frozen into 1" cubes. We would take a bag out, toss the block of frozen cubes (out of the bag of course) in the boiling water, and when the water began to boil again, remove them, put on ice and eat like shrimp.
We called it "Poor Man's Shrimp", but we felt very rich while eating them.