I'm not sure what you mean by an unenforcable rule, other than how hard it would be to catch someone doing the old bucket biology thing. I believe what I have read, and what I have heard at the meetings with the WDFW is that a pike caught in the POR or any other waters can be released back in to that same water. Where breaking the law comes in is when someone takes a pike, transports it to another body of water, and drops it in. The way the sign reads though can be confusing. It simply says "If you see someone transporting or releasing live fish, call the Washington state patrol".
I wonder how many concerned citizens that read this sign will missinterprate it and call the state patrol when they see someone release a pike in the POR, because they didn't understand.
They may have to channel some of that 10 million dollars to the WSP to help handle the extra amount of calls. LOL
If I get pulled over by a WSP officer on the way home for a tail light, I wonder if the officer is going to ask to look in my live well to see if I'm transporting any "LIve fish"? I suppose they could, but I would imagine they have better things to do.
On a related story, I talked a while back with a guy from Arizona. His buddy caught what he thought was a new Arizona state record large mouth bass. He didn't want to kill the fish and remove it from the gene pool, so he put it in his livewell and went looking for a certified scale. He thought he would weigh it, have the new record, then put the fish back in the lake where he caught it. When he got close to the local game office, he wondered if they would have a scale. He stopped and asked the question. The warden asked to see the fish. After he had proudly displayed his catch, the warden told him he didn't have a certified scale, but what he did have for the happy fisherman was a ticket for transporting a live game fish. Needless to say, my friendss friend was less than happy. There's what you get for trying to be a responsible fisherman and also obtain a new state record.