MODELING WASTE OUTPUT FROM TROUT FARMS

The aim of waste modelling in aquaculture is to provide tools for simu lating input, transformation, output and subsidiary degradation in rec ipients of organic compounds, nitrogen, and phosphorus. The direct pur pose of this modelling is to make it possible for caretakers and water authorities to calculate waste discharge from existing and planned aq uaculture activities, A special purpose is simulating outcome of waste water treatment and altered feeding programmes. Different submodels m ust be applied for P, N, and organics, as well as for the different ph ases of food and waste treatment. Altogether this calls for an array o f co-operating submodels for a sufficient coverage of the options. In all the required fields there is some scientific background for numeri cal model approaches, and some submodels have been proposed. Because o f its multidisciplinary character a synthesized approach is still lack ing. Within trout farming this work attempts to establish the differen t submodels and outlines future possibilities for synthesizing the kno wledge to a numerical model.