A strategy to optimize the arrangement of multiple floating net cage farms to efficiently accommodate dissolved nitrogenous wastes
Marine aquaculture generates considerable amounts of effluent in the form of solid (waste feed, faeces) and dissolved substances such as nutrients, pesticides and pharmaceuticals which are released directly into the water column. With the rapid development of floating net cage culture in the mid 1970’s, concerns grew with respect to its environmental impacts.Ongoing improvement of feed technology and higher ingestion rates leads to a reduced wastage in the form of particulate organic matter, making dissolved substances a more important factor.So far, no clear link was laid between the placement of multiple floating net cage fish farms and mitigation of dissolved floating net cage farm wastes. Since the degree of nutrient enhancement is related to the nutrient discharge of a given standing stock and the physical characteristics of a water body at both farm level and at greater distances away from the farm. Therefore, adequate farm placement and methods to optimize the distribution of cultured fish over multiple floating net cage farms provides leverage to reduce potential impacts of the dissolved wastes which are directly released into the environment. This study targets to develop strategic measures to optimize the arrangement of multiple floating net cage farms and the distribution of the standing stock to efficiently accommodate dissolved nitrogenous wastes into the direct environment and to minimize nutrient concentration enhancement and potential triggers of eutrophication effects.
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