This study describes one possible application
of this concept: planted trickling filters adapted
to provide nitrification in recirculating systems
for fish production. This combination of fish
and plant production in an integrated recirculating system is called aquaponics [7]. Many different system concepts are feasible, depending on
the target crops or resources available [8]. Our
research focused on the selection of crop plants
characterized by high productivity and thus
nutrient recycling capacity. To test the suitability of the new combined production system for
vegetable producers, we compared plant productivity in aquaponic and in conventional hydroponic systems.