Nationwide assessment of the suitability of the Norwegian coastal zone and rivers for aquaculture (LENKA)

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Abstract
A coastal zone management program called LENKA—Nationwide Assessment of the Suitability of the Norwegian Coastal Zone and Rivers for Aquaculture— was started in 1987 and ended in the summer of 1990. The program aims to develop an efficient and standardized tool for coastal zone planning. In the program consideration is taken of all important existing utilization and judicial aspects connected to the Norwegian coastal waters. As part of the program a methodology for assessing the suitability of marine areas for aquaculture has been developed. The marine areas ‘ holding capacity is determined by a developed model. The main steps in the development of the capacity assessment are as follows: (1) An assessment of the maximum acceptable organic loading of the water body of the marine areas, which is arrived at by subtracting the existing inputs of organic loading and nutrients from the natural capacity of the area to tolerate organic loading and nutrients. (2) An assessment of the area available for aquaculture development, which is arrived at by subtracting all unsuitable areas and all areas already occupied from the total area. The LENKA program shows that 9 percent of the Norwegian coastal areas are suitable and available for aquaculture purposes using current techniques. The annual production of salmon and trout, which in 1990 was 161,000 tonnes, can be increased by approximately 600,000 tonnes without causing detrimental effects on the environment.

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