Hoppy is right about the position up till June, and as of after that date it will be strongly recommended. If after that period there is little compliance, I think one of the favoured options is legally enforceable C&R.
The Nith has experienced a similar decline to the Annan, although the Border Esk's decline seems the most catastrophic, down to just two hundred odd fish last year (salmon were ok). It seems to be a Solway-wide problem, with echoes of it elsewhere in Scotland. A lot is being done to investigate the causes and consider solutions, as ever with these things there is usually not one single cause.
At the risk of sounding complacent (i'm not) The one glimmer of hope is that sea trout seem to be much more mercurial than salmon, and populations seem to be able to recover as quickly as they deteriorated. I would not like to put money on it though. This particular episode on the Solway (and more specifically the Esk) has been tracked since 2001.
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