On the subject of transporting trout and other fish in cold water. Back when I was a juvenile delinquent my college roommate and myself had different trout in our fish tank at home, even one that was more of just a joke because it was nearly as long as the tank. We always grabbed a bag of ice and made sure the water was from the lake and made sure to keep ice in it for the drive home. The ice releases oxygen and kept the water cool for the ride home. Just suggesting this if you ever need to transport a trout, have some ice handy.