Scottish salmon farmers have launched a sustainability audit to reinforce their green credentials. The first-ever industry-wide survey is intended to identify problems and highlight cases of best practice as well as give a more accurate idea of the industry's carbon footprint. "The salmon industry has always been aware of its environmental responsibility and been extremely well regulated," said Sid Patten, chief executive of the Scottish Salmon Producers' Organisation. "But a survey such as this may help to inform consumers about the sustainability of salmon and developments in the industry." Positive results from the survey, which is now under way, could help to appease the industry's long-term critics, who claim salmon pens pollute the sea and spread disease among wild salmon. The exercise also aims to benchmark salmon farming against sustainability in other sectors of the food industry.