Crayfish when abundant in a pond as you describe will create murky, turbid water. There is likely no weeds nor filamentous algae in the pond since crayfish do eat plant materials. If you trap and thin out the crayfish they will make good forage for the pond with bass. Thinning out the crayfish will reduce the turbidity so RES will 'do' a little better in the small 'crayfish' pond. RES will probably eat YOY crayfish when crays are less than 1" long. If you can reduce numbers of crayfish so water is a little clearer, I would try stocking the RES. If they don't grow well then try another fish species.


aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management