Invasive species not only affect other species in their ecosystem, but cost the United States more than one hundred and twenty million dollars in damages each year (“Cost” par. 2) . Invasive species come in different forms and all have a negative impact on the environment. These species can enter a new area undetected initially, but as time passes their effects will soon be visible. Efforts are being made to prevent these invasive species from destroying fish populations and habitat, but to be successful they need to be done on a much larger scale. To protect Wisconsin's waters, which are already infected with many invasive species causing severe damage to our water bodies, additional action must be taken. It is critical that we remove all invasive species from Wisconsin waters because it will improve fish habitat, native fish populations, and water quality. The habitat of fish is the underwater world that many people do not see. It's just like the world people live in. Fish and plants breed, eat and live in this environment and also face challenges such as invasive species. It is said that “invasive species are non-native species that threaten the diversity or abundance of native species due to their uncontrollable population growth, causing ecological or economic impacts” (“Invasive” par. 1). Vegetation plays an important role for fish habitat and for the lake itself. The aquatic habitat provides living space not only for fish but also for many aquatic insects. These insects then in turn provide food for fish and other species of animals (“Natives” par. 4). This vegetation also provides plenty of cover for fish. Aquatic plants provide a great source of food supply and act as a nursery for young fish (“Native” par. 5). Vegetation serves many purposes in fish habitat; as well as keeping fish safe. It also helps keep lakes clean. Aquatic plants circulate water and help absorb pollutants. Another great benefit of these aquatic plants is that they help retain sediment and lake shores while providing oxygen to the water (“Invasive” par. 7-8). Unfortunately, invasive species are destroying this vegetation. The common carp or “Cyprinus carpio” is one such fish that is causing serious damage to lakes around the world.