Numerical Analysis of the Environmental Impact of Silver Salmon Farming in Miho Bay

Abstract

In order to evaluate the environmental capacity quantitatively, we investigated the environmental impacts of silver salmon farming in Miho bay by numerical simulation. Terrestrial load through the rivers, and aquaculture waste load were considered as the external conditions. A nested grid system was introduced in numerical simulations. As a result, seasonal variations of total nitrogen, total phosphorus, chemical oxygen demand, and dissolved oxygen concentration were reproduced. Water quality varied around the farm. However, the change in dissolved oxygen concentration indicated that fish farming had little direct impact on the surrounding environment under this simulation condition. In the future, aquaculture waste load models should be improved, and a benthic model should be introduced.