Lake Tahoe, second deepest lake in the US, is said to have been mysteriously invaded by giant goldfish.

This information came into lime light when a group of researchers from Davis in the beginning of annual survey in 2006, studied the presence of goldfish in Lake Tahoe. This invasion has been taken as an alarming issue among the researchers that the arrival of goldfish may threaten the native species and will also increase the pollution problem.

Christine Ngai from the University of Nevada was quoted as saying, "Goldfish are very good at getting what they need. They can potentially compete with native fish for food, vegetation and bugs". She also adds that goldfishes eat a lot and resultantly excretes a lot, which will ultimately get transferred to the water body and encourages the growth of algae thus polluting the water.

The group of researchers, who sought out the survey in 2006, began a project in Lake Tahoe to reduce the number of invasive goldfish and all the other non-native fish through the process of `electrofishing'. In this process, the dangling metal wires with electrical current are dropped in water from the bottom of the boat to stun the fish and then capturing the same when they run towards the surface. But the effort proved not enough due to their foraging abilities.