Speaking as a member of the Spey Fishery Board & Chairman of its Research Trust, I can verify what Wilie Gunn says.
There is more than one way of exercising catch restraint & even if the Scottish Executive's & my own favoured method is catch & release, this recommendation re reduced fishing effort is an acknowledgement that some beats choose to exercise restraint in this way. It is not meant to be precise. Some for example do not fish at all until April. Others have reduced the no of rods or the no of hours fished.
We consider catch & release at 70% was a great success last year and as a result are continuing the same policy unchanged for 2004 rather than tinker with it.