When the temperatures drop don't sit at home but go fishing. With the water temp in the 40's I slow down my approach. The fish tend to get lethargic but they still feed. I have found when the water temps get into the 50's i can speed up my trolling.

Now with that said when you fish in the frigid temps you will encounter icy rod guides. To get rid of the ice i dip my rod in the water and give it a shake. The water temp is usually warmer than the air temp. The ice on the rod guides can cut your line and cause a lost fish.