“Many years ago we noticed that an alpine lake with large trout had many crayfish or crawdads in it. So we took a “bunch” of these crawdads over to a nearby lake which was overpopulated with eastern brook trout. In the following years, it seemed that the eastern brook population in the nearby lake decreased and fish were considerably larger. We wondered if the increase in fish size was due to the trout feeding on the crawdads or due to the crawdads eating many of the eastern brook trout spawned eggs.”