We troll all winter. Sometimes you find them in deeper water and have to slow down or use heavier jugs. At other times you will find them in shallow water, lets say 8-10 ft. A few warm (this is all relative) days in a row is good. You may troll one day and catch 10-15 and other days 50-60 using the same technique. Changing colors helps at times but sometimes they just will not bite anything.