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Do you have permission to "fix" it or just fish it? I'd start filling buckets with the smallest ones and let the 6"+ bluegill and 8"+ crappie go. Dump them in a pile along the shoreline for the coons. Come spring/summer put in some more bass and some catfish.
eat the bass
From a pond management site:A good rule of thumb for maintaining balanced bass/bluegill populations is to remove at least 4 to 5 pounds of bluegill for each pound of bass removed. Keep all bluegill caught. Most over-population problems are caused by small bluegill, and returning them only adds to the problem.