With all the bickering here you can pretty much be sure the guy isn’t going to post the picture of the next fish he catch’s!
Catch and release isn’t the law. While most of us migth agree to let these larger fish go, there is nothing wrong with the person keeping the fish, it’s perfectly legal.
Besides, the bioligists have enough water to chime in on here in Minnesota – hopefully they leave Pool 4 alone. It’s survived this long and seems to be doing just fine.