Aquaculture In 20Th Century

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141 Reviews in Fisheries Science, 8(2): 141-150 (2000) Sustainable Aquaculture in the Twenty-First Century William A. Wurts Kentucky State University, Cooperative Extension Program, Research and Education Center, P.O. Box 469, Princeton, KY 42445-0469 USA ABSTRACT: There have been many efforts to create a conceptual framework for understanding and defining sustainable aquaculture. A recent consensus or stakeholder view (Caffey et al., 1998) approached sustainability from three perspectives: environmental, economic and sociological. Often, stakeholder views are snapshot or present oriented. The multiple variables affecting sustainability and viability are considered from a here-and-now perspective rather than considering the effects that significant change in one or several variables might cause. Aquatic nitrogen loads generated from the sewage effluent of a growing, global human population (15 billion vs. 6 billion people) may prevent the legal discharge of any aquacultural effluents. Much of the intensive aquaculture industry has a highly centralized structure with respect to production and distribution. This centralized development has flourished around energy rich -- at times extravagant -- cultures and economies. How will increased costs or shortages of electricity, gasoline, and diesel fuel affect the sustainability or survival of the current production system? Does a large, centralized industry provide more jobs and profit or a better quality of life (per capita) than widely dispersed, small scale operations producing at local or county levels? Nutrient recycling (converting nitrogen back to protein) through different polyculture systems could be more practical and efficient than controlling or treating the effluents associated with traditional, intensive monoculture practices. Phytoplankton and zooplankton occupy sizable respiratory
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