MARINE AQUACULTURE IN DENMARK

During the last five years marine aquaculture has developed rapidly in Denmark. Today the following species are used in mariculture either in laboratory scale or in commercial farms (underlined): Rainbow trout ( Salmo gairdneri ), turbot ( Scophthalmus maximus ), eel ( Anguilla anguilla ), lobster ( Homarus vulgaris ), the European flat oyster ( Ostrea edulis ), Pacific oyster ( Crassostrea gigas ) and blue mussel ( Mytilus edulis ). The marine production of rainbow trout in 1981 was approximately 405 tonnes with an expected rise to about 500 tonnes in 1982. Problems with Vibriosis and Furunculosis have occurred. A method of vaccination against Vibriosis by spray‐pistol has given promising results. Several new types of net cages have been constructed using a combination of traditional floating net‐cages and pound net poles placed in the sea bottom. Hatching and rearing of turbot and lobster have been successfully accomplished on a laboratory scale. Today turbot are found in two experimental fish farms which utilize heated effluent from power plants. The oyster Ostrea edulis has been extensively cultivated in the Limfjord area for about 100 years. The yearly production has varied between 100,000 and 4 million individuals with the lowest values in recent years. In 1978 Crassostrea gigas was introduced in Denmark. Culture beds for blue mussel have been established but at present the production cannot be estimated.