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Modelling environmental impact of cages (Tropomod). The TROPOMOD model is a particle tracking model which simulates the dispersion of waste feed and waste faecal particles from fish cages. Using depth and current velocity data from environmental surveys and husbandry data such as cage layouts and feed ration from production surveys, TROPOMOD was used to predict flux of waste solids to the sea bed (grams waste feed and faeces m-2 sea bed day-1). This was then related to a level of impact on the sediment benthos. The model was used to examine the existing situation at the Sual and Panabo AquaParks and then test various scenarios for site optimisation and future production of the AquaParks.