Problems related to availability and price of suitable raw materials (invertebrates) and the low tolerance to crowding have hampered the development of intensive sole culture. Pond culture systems in which sole can graze on natural foods in ponds could be an alternative. However, hardly any information exists on factors that determine productivity parameters of such a system. This study presents insides into which factors limit growth of common sole foraging on ragworms in ponds. Results from this PhD study suggest that the growth of common sole in ponds is not limited by nutritional but by their foraging abilities.