Troutbert is right...the Fishing permitted trumps the NO TRESSPASSING sign for fishing only.
Once I took a buddy to a common approved trout water in our watershed. THe fishing permitted signs were missing and he said, we can't fish here it's posted. I said would you feel better if it said fishing permitted? He said yes. So I got a sign out of my car and put it up with a screw gun. When his mouth came up from the ground, we fished. On the way back, the landowner was driving down the field and I stopped him to talk, introduced myself and told him I put up the sign...he said he wondered when they were going to replace them.
Truth is it is largely left up to clubs and civilians to distribute the signage. But we get them from the WCO's and it is left to our discretion on where to put them. But they SHOULD be visible on any approved trout water. Or any water where PF&BC Co-op fish are stocked. But it is NOT a requirement for the clubs. However, Co-ops MUST stock fish where the public is welcome to fish.
Maurice