Environmental effects of marine Norwegian fish farms
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Sedimentation rates under fish farms may be very high, and high levels of fish stock may lead to harmful accumulation rates of the nutrient salt ammonia. The environmental effects of the organic load range from minor changes to heavy pollution, depending mostly on the hydrography and topography. Fish farms seem to have a different environmental impact than that of sewage, and it may be inappropriate to measure their outputs in terms of Biological Oxygen Demand.