Mathematical model ofLaminaria production near a British Columbian salmon sea cage farm |
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| Authors: | R J Petrell K Mazhari Tabrizi P J Harrison L D Druehl |
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| Institution: | (1) Department of Bio-Resource Engineering, University of British Columbia, Vancouver, B.C., Canada, V6T 1Z4;(2) Departments of Oceanography and Botany, University of British Columbia, Vancouver, B.C., Canada, V6T 1Z4;(3) Department of Biology, Simon Fraser University, Burnaby, B.C., Canada, V5A 1S6 |
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| Abstract: | The technical and economical feasibility of farmingLaminaria saccharina for a food base product near a salmon sea cage farm was evaluated. Suitability of kelp for nutrient removal was also analyzed. A computer model of a conceptualized system was developed in order to make the assessments. Kelp growth was modelled as a linear function of temperature and background dissolved inorganic nitrogen concentration, and it was partially experimentally validated. Based on model simulations, aLaminaria farm containing 10,60 m ropes on each end of a salmon sea cage farm is fertilized by the salmon farm and yields annually 1600 kg of dried kelp. The payback period for the initial investment of $61 × 103 is 6 years after which an annual net profit of 20 × 103 Canadian dollars ($16.68 × 103 US) can be achieved. The net present worth of the kelp farm was positive for a rate of return up to 25%. Kelp production on multiple salmon farms or at a higher kelp density could increase the overall revenue.The kelp farm does not appreciably affect background nutrient or oxygen levels. With a few modifications in the model,Nereocystis andMacrocystis farming can be substituted and evaluated for feasibility and nutrient removal efficiency. |
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| Keywords: | integrated culture kelp salmon growth economics nutrient uptake |
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