As a relative neighbor, I live about 100 miles from you, I would say that you don't have to worry about the mosquito fish. While they are quite prolific in our area, they are also prime prey for the other fish in your pond. You already have the nibblers in place - the Bluegills and the "perch" are the critters that will sample appendages when available. They CANNOT harm you in any way, so just relax about them. It would appear that the pond was not established with fishing in mind, otherwise there would be concern about the Crappies eventually taking over the pond. The catfish will continue to grow and will probably get to about 10 lbs at least. They are the ultimate predator at this point but will probably not reproduce. The large numbers of mosquito fish are doing their job and I don't think you should give them another thought.
Jim