Szlauer B., 1976. Possibilities of using zooplankton removed by the river Płonia from lakes to feed young fish. Acta Ichthyol. Piscat. 6 (2): 39-53.
The biomass of zooplankton removed by the river Płonia from the lake Płoń, amounting to ca 135 000 kg a year, can serve as food for about 5 million young fishes. There is a possibility of utilising this biomass to feed young fish cultured in ponds or cages.