Lake trout, however, are voracious, efficient predators that frequently live 20-25 years and are able to reach large sizes—the Wyoming state record for a lake trout is approximately 23 kg (50 lb. ; Martinez et al. 2009). Their large size enables them to produce thousands of eggs annually, which leads to rapid population growth and an expanding distribution. Lake trout can consume cutthroat trout up to one-third their own size. Although lake trout need energy-rich prey such as cutthroat trout to continue to grow, they can persist for years with minimal food resources due to their cold-blooded nature. For example, in a reservoir in Colorado, tagged lake trout persisted for over 10 years after the loss of kokanee salmon, their preferred prey, though most of these fish had not grown since release (Martinez et al. 2009).