The earth is a water planet, and lakes, saltwater and freshwater, natural and man-made, can be found all over its surface. Almost two-thirds of the world is covered in water, and while most of this is ocean, the number of lakes is considerable. Washington State alone has more than 7,800 of them; Minnesota, more than 12,000. Many varieties of plants and animals live in lakes. Some of these are simply aquatic plants and animals that could live in almost any water and some are specific to an area or a special habitat.
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Too many fish varieties live in lakes to be listed here. Lake fish include trout, salmon, bass, catfish and perch. The northern pike is a common freshwater fish found in lakes all over the world. In the United States, major northern pike populations live in the Great Lakes Basin, New England, Alaska, Arizona and even northern New Mexico. According to Minnesota Department of Natural Resources, pikes live in almost all of the state's streams and lakes. Pikes are meat-eaters and are a favourite of fishermen because they are so voracious that they will easily take the bait of a lure. Most pikes weight around two or three pounds, but trophy pikes have been caught weighing more than 9.07 Kilogram.
Aquatic plants like cattails and pickerelweed often live in or around lakes. There are several species of cattails, also known as bulrushes, famous for their fuzzy, elongated exteriors. Pickerelweed is less well-known. It is an aquatic plant which lives in or around streams, ponds and lakes. Pickerelweed grows to 3 or 4 feet tall, but 1 or 2 feet of the plant's length will remain underwater while the rest grows into the sun. Pickerelweed is distinctive for its bright purple flowers, which grow on large protruding spikes. The flowers are quite small and grow in clusters. Pickerelweed flowers begin to bloom in July and keep going until November. Various wild animals can eat pickerelweed leaves, including deer, geese, ducks and muskrats. The plants can also provide a protective cover for fish, reptiles, birds and amphibians.
Several kinds of snakes live near lakes. The most feared is the poisonous water moccasin, also known as a cottonmouth. Water moccasins are the only poisonous water snake in North America, and are essentially pit vipers. The Lake Erie water snake should not be confused with the highly deadly water moccasin. Though the Lake Erie water snake will defend itself by biting if threatened, it is nowhere near as dangerous. Adults can grow to be between 18 and 42 inches long. It typically has a grey colouring with a white underside, although it can also be green or brown. The Lake Erie water snake does not actually live in the lake but rather near the edges of the water. Its favourite sunning spots are rocks and other handy surfaces on the shore. Lake Erie water snakes can and will swim, however. These snakes can swim both across the surface of the water as well as dive to the bottom of the lake. Lake Erie water snakes usually eat fish and may interbreed with the Northern water snake.
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