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A minor part of the Swedish aqua culture is farming of pike-perch and perch. Of the shell fish production, blue mussel has the highest tonnage, while oysters and crayfish are more limited. The main tonnage of fish is produced in the continental zone, while the Swedish west coast is the area for production of blue mussels for consumption. Many of the Swedish farms are quite small compared to the ones in other parts of Europe, but there is a trend towards bigger units. A large proportion of Swedish aquaculture is owned by foreign companies, mainly Finnish. The interest in production of blue mussel for consumption has slightly stagnated during 2012, while interest remains high for the cultivation for the purpose improving environmental conditions. Swedish oysters are popular and in demand but it is difficult for the industry to maintain a high production. The health status in Swedish aquaculture is still high, serious diseases and outbreaks are rare.
Trade in live animals
In 2012, 198 pigs were brought into Sweden from Norway, 5,400 pigs from Finland and 6 pigs from Denmark. Thirty-two cattle came from Denmark, 13 cattle (Bubalus bubalus) from Germany, 90 sheep from Finland (of which 82 for slaughter) and 270,400 day-old chicks from Great Britain, Ger-many, the Netherlands, France and Norway.
The number of animals leaving the country during 2012 were 330 cattle, 7,871 pigs of which 7,467 were sent for slaughter to Germany, 9 sheep were sent to Denmark and 4 sheep to Lithuania. Alto-gether 2,515, 500 day-old chicks were sent to Den-mark, Lithuania, Poland, Germany, Latvia and Norway.
Animal databases
The United States Board of Agriculture is responsible for the Central Register of Holdings. Each holding is allocated a unique identification number (holding number). The register contains information concerning the holdings of bovine animals, pigs, sheep, goats, laying hens and poultry with details on hold-ing number, visiting address, type of production, capacity and the geographical coordinates (for pigs, sheep and goats) of the holding as well as the name, address and telephone number of the keeper. All egg producers with a capacity of at least 350 laying hens and all those selling eggs for consumption must be registered. The register contains specific informa- about production method, capacity and the number of houses and sections on the holding.