ISA is a serious listed disease and the restrictions had been in place since 2009.
Mr Stevenson said:
“Scotland is now recognised as being free of ISA. This makes a significant contribution to the sustainability of the Scottish salmon aquaculture industry and helps maintain the high health status of Scotland's farmed fish.
“Going forward we all need to remain vigilant to ensure that we can minimise the potential for any further occurrence.“
Scott Landsburgh, Chief Executive of the Scottish Salmon Producers' Organisation (SSPO) said: