Correct, that's the fishery owners job, and one you should never mess with on a wild fishery.
The magazines write any old shoyt to sell units. Some of the new ideas they come up with, just to print something different, is just unreal.
I'm waiting to read about fishing flooded fields with woolly bugrs for the two or three (guaranteed.. they're experts so you have to believe it) huge trout which always come out of the main river to cruise the shallow mucky field waters to gobble up drowning field mice.



Sure as hell there will be a pic of a flooded field next to the river with a man dressed in immaculate attire with forty seven adverts hanging from his waistcoat as he proudly holds aloft a 4 punner with a large, furry lure hanging out its mouth, coupled with a small (inset) pic of a wet dead mouse for comparison.
There was a photo from a magazine published here a few nights ago and I commented that the guy was a complete muppet for holding the fish aloft (on the fly) with almost it's whole body dangling (from the fly) out of the water, just for a pic.
That's shameful sales tactics.