 Production of bivalve molluscs by mariculture in 2010 was 12 @,@ 913 @,@ 199 tons , up from 8 @,@ 320 @,@ 724 tons in 2000 . Culture of clams , cockles and ark shells more than doubled over this time period from 2 @,@ 354 @,@ 730 to 4 @,@ 885 @,@ 179 tons . Culture of mussels over the same period grew from 1 @,@ 307 @,@ 243 to 1 @,@ 812 @,@ 371 tons , of oysters from 3 @,@ 610 @,@ 867 to 4 @,@ 488 @,@ 544 tons and of scallops from 1 @,@ 047 @,@ 884 to 1 @,@ 727 @,@ 105 tons . 
