What are the dangers associated with farming of transgenics?
QUESTION FIVE What steps should be taken to reduce the risk of aquaculture to wild salmon? Alternative approaches and technology Dr. Helgi Thorarensen, Professor and Head of Aquaculture, Holar Agricultural College, Holar, Iceland Fish farms in Iceland use predominantly large, land-based rearing tanks. This is necessary to utilise geothermal water for aquaculture and to adapt to harsh natural conditions. The environmental impact of these land-based units is much less than from sea cages, since organic material can be removed from the discharge water and there are few possibilities of fish escaping. Also water requirements are kept at minimum with oxygen injection and re-use of water. The danger of disease spreading from land based units is much less than from cages since the rearing water can be disinfected. Moreover, drug treatment of the fish can be contained in the tanks and lower doses are required than in cages. Although the initial cost of constructing land-based units is high com
