Derived data for more effective modeling of solid wastes dispersion from sea cage farms
2000
Chen, Y.S. | Beveridge, M.C.M. | Telfer, T.C. (University of Stirling, FK9 4LA, Scotland (UK) Inst. of Aquaculture)
A focus of research is modeling the nutrient loading from cage aquaculture in order to predict impacts to allow more effective environmental management. At present, waste dispersion models for marine cage sites rely on scant data on settling velocities of food and fish feces that do not take into account pellet sizes, environmental conditions (temperature, salinity), feed formulation and re-suspension and degradation of settled food and fecal pellets. The present work presents empirical data that allows more effective modeling of solid waste dispersion. The data has been used to refine existing models predicting the fate of nutrients from marine cage farms using mass balance and spatial vector techniques. In this study, the environmental impacts of cage aquaculture and waste dispersion modeling was first briefly reviewed. The methods of determining settling velocities of commercial feeds for sea bass and sea bream, nutrient leaching rate for salmon feeds under defined laboratory conditions and general sedimentation rate of the solid waste from in situ cage farm were then outlined. Data for incorporation into solid wastes dispersion models are summarized
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