Recently I've fished my pond at my house that used to have a lot of bass in it. including some very nice size bass! It's always been a little mossy, but I've noticed a decline of bass population the past few years, now this year I haven't seen any bass or caught any. I'm not sure what the problem is but I'm very frustrated because the pond used to be very good for bass fishing. There used to be big research sunfish in there and big bluegills, now their all small, could somebody tell me the problem?