A crackdown on fish poaching opposite Wales has seen 139 people prosecuted in a initial 4 months of a year, says Natural Resources Wales (NRW).
The authorised movement has seen those concerned fined £18,000 in total.
On Tuesday dual group were a latest arrests for bootleg fishing, after being found on a boat with a net on a River Usk in Monmouthshire.
But officials contend a emanate is a problem opposite Wales, and threatens an angling attention value £150m a year.
Since a start of a year, people have been held fishing illegally or poaching from a Loughor bay in west Wales to a Menai Strait in Gwynedd and a River Dee in Flintshire.
NRW pronounced a biggest regard was “foul hooking”, that involves boring hooks by a H2O during high speed in an try to slash fish.
This mostly leaves some-more fish shop-worn and failing in a stream than are brought to shore, a orator said.
The fish many threatened are furious salmon and sea trout.
The orator said: “Illegal fishing has inclusive consequences as angling is value some-more than £150m to a Welsh economy.
“Illegal anglers can repairs a whole ecology of a stream as good as impacting on angling as a sport.
“Angling helps strengthen a sourroundings and is a large pull for tourism.
“It’s critical that we continue to moment down on bootleg fishing activity so that it stays tolerable for protected fisherman.”