California Officials Tackle a Toothy Lake Predator

http://www.nytimes.com/2007/09/12/us/12pike.html?ref=invasive_species

In the early 1990s, the northern pike fish was somehow introduced to Lake Davis, a Sierra Nevada reservoir in California. These fish became extremely overpopulated and cause much damage to the natural ecosystem of this lake. They are known to eat anything that comes in their path, including small dogs. Since they are so disruptive, people have been using methods such as poison, electro-fishing, explosives and decidedly low-tech nets to try and eliminate the prominence of these fish. This has only created a tiny dent in their population, and people are constantly working to eliminate these fish. This is an example of the dangers of introducing a species to an environment where it has no natural predators to keep its population in check.