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Mussel production decreased by 3% from the 2010 total and survey responses attribute the cause of the decrease to include: envi- ronmental effects such as variation of spat settlement in time and place in recent years; the detection of toxins which ham- pered sales, and several businesses which ceased trading. The greatest contribution in regional mussel production was from Shetland, accounting for 4,567 tonnes or 65% of Scot- land’s total. Pacific oyster production increased by 4% from 2010.
The Strathclyde region produced about 84% of Scotland’s farmed Pacific oysters. Queen production fell by 85% since 2010, a contribut- ing factor was reported as poor spat settlement, while production of farmed scallops increased by 22%, continuing to target niche markets. Native oyster production remained the same accounting for a small percentage of total oyster production, however, demand for this species continues to be high.