Please see this link to a recent article by the Sunday Times exposing what many would see as an insupportable financial benefit to the RSPCA from Scottish salmon farmers. The tweets further down the blog probably reflect the views of many of us.
The same blogger has a pretty comprehensive trail here of reported welfare issues in Scottish salmon farms.
Please make sure that as many people as possible are aware of this by circulating it – not just to fishermen, but to those who buy farmed salmon and the wider public at large.
The more people who are aware of the situation, the greater will be the pressure for corrective action.