Usually not always a new pond with clay bottom has to form a biofilm "skin" layer on the bottom to help seal the loose sedimented colloidal clay on the bottom. First thing to check is do the jar sedimentation test to see if the clay particles will settle if left undisturbed. If the exposed clay dirt shoreline has wave action as noted by Snrub this keeps the colloidal clay in suspension. Snrub provides excellent advice of "Probably what helped more was adding some 2-4" rock lining the north and south shores keeping the wave action at bay. If you are in a windy location (these ponds are) wave action along a bank will definitely stir up clay turbidity." Notice one form of bio-growth in the link below that occurs among the rocks applied by Snrub. This eventually helps "seal" the clay from the overlying water and helps reduce currents from resuspending the surface layer of sedimented colloidal clay.
Bank erosion and rock lining Application of rock or broken concrete to the down wind shoreline should to a lot to reduce constant clay turbidity. However remember, wind always comes from all directions during a period of every 3-4 weeks.
