Influence of fish cages on water environment by a numerical approach

摘要

Fish cages arranged at upper layers exert an influence on water flow in the aspects of both velocity and direction, and the attenuation of water current velocity mainly depends on flow direction. Scenario simulations indicate that the increased solidity ratio due to the adhesion of sea creatures will further enlarge the stratifications of water temperature and salinity. This will cause unfavorable conditions for vertical transport of dissolved oxygen. The numerical analysis using the coupled model of an ecosystem submodel and the two submodels in the present study will be required to assess the change in water quality such as the concentrations of chlorophyll-a, nutrients, and dissolved oxygen as future studies.