Providing healthy and clean rotifers as food to the fish being of vital importance, every reduction of counter-natural actions impeding physical activity or general quality
on the rotifers needs to be avoided. If, moreover a second handling becomes redundant because of the non-compulsory enrichment step it contributes to simplification of operational tasks. In a following stepit even opens the door for standardization and/or automation of the
production bringing relief in daily operations.