The problem with tilapia is the are mouth breeders i.e. they holdvery small fry (tiny baby fish) in thier mouths to protect them. If you release a tilapia you are also releasing the possible thousands of tiny fry in its mouth and gills even after you have taken the hook out.
As for eating the bass they are excellent. I fillet and skin my bass and cut into chunks about 30-40mm square and egg and cornflake crumb and deepfry.......geez my mouth is awash just thinking of it. add some salt to the corn flake crumbs and you wont be able to telkl the difference between salt and freshwater fish.
Large bass aparently are not good in stocked impoundments as they eat fingerlings by the dozen. I generally take one large bass each time i fish the dam.
Jack.