We are in Northumberland again

Each year I bike down to the Tweed to watch the Salmon Fishermen
At low tide they row out to a little islet that appears in the  middle of the river and set up a winder to bring in the net that one man rows out with in a great curve out to the shore.
In the five years i have watched them, they have never caught a single Salmon.
It makes me wonder if they do it to get away from the wife and go for a crafty pint afterwards?