If it is wind/wave action, there will also be considerable erosion where the waves break... My first guess is the aeration diffuser...a second guess is that the 100 "Catfish" that were stocked where not Channel Catfish, but Bullhead Catfish instead.
100 catfish in 3.5 acres is not nearly enough to cause a turbidity issue...1000 might have a strong possibility of causing turbid water. Bullheads on the other hand root around and are always muddying the water.
Cattle will muddy the pond badly also.
