AN environmental campaigner is claiming the numbers of fish in Scottish salmon farms dying from disease will increase this year.

Don Staniford, a Vancouver-based activist working under the Global Alliance Against Industrial Aquaculture, said figures showed a potential trend that could mean more fish die in farms this year than the seven million recorded for 2011.

He said statistics from the Scottish Environment Protection Agency – which he has released under the title "Fishyleaks" – showed there had been more than two million dead fish recorded in salmon farms around Scotland in the first three months of 2012 alone.

Mr Staniford said there were a variety of diseases affecting the dead fish, known as "morts" .

He said: "In 2011 there were 6.9 million morts – an increase on the 5.3 million reported during 2010.The 'mort mountain' includes nearly 700,000 dead farmed salmon from just 11 sites."

One firm said the figures it provided the campaigner were inaccurate due to a recording error by the company.

The Scottish Government said the most recent figures it had showed no indication of an increase in the numbers of farmed salmon that die during the process.

Scott Landsburgh, chief executive of the Scottish Salmon Producers’ Organisation, said: "There are huge benefits to farming fish in a natural pristine environment.  However, from time to time, fish can be lost to the likes of attacks by aggressive seals, naturally-occurring algal blooms, jellyfish and 100 mph storms. 

"Fish farming is highly professional, but losses can happen, just as in terrestrial farming.  The RSPCA Freedom Food welfare scheme, which is used by the majority of salmon farmers, ensures the highest levels of welfare are adopted.

"Wild salmon are exposed to exactly the same factors as farmed.  The survival of farmed salmon is vastly higher than the survival of wild salmon."