is home to the largest population of Lake Sturgeon in the world. The sturgeon which spawn annually in the springtime in the Wolf River and its parent, the Fox River, between approximately April 15 and May 5, as they swim upstream from Lake Winnebago. It is estimated that the extent of the Lake Sturgeon has dropped to about one-tenth of its population in the state since year 1800. This species, which has existed since the time of the dinosaurs (100 million years ago), has a viable naturally reproducing population, which are highly prized for the taste of their flesh, and also for their eggs. Female sturgeon deposit their eggs only about every four to six years, starting at 20 years old, up to their life span of 50 years. At this age, the sturgeon are five feet long. The fish spawn in the shallows of the Wolf river, as they swim upstream. In order to protect the spawning locations of the sturgeon from poaching when the fish are the most vulnerable, the Wisconsin Department of Natural Resources formed a citizen sturgeon guard called Sturgeon For Tomorrow in the early 1990s. They volunteer to watch over the spawning sites during the spawning season. Walleye The walleye is very popular during their spawning period, during the spring. Many fishermen set out to catch their daily limit. The walleye is probably the most prized fish on the river. White bass The white bass or sand bass (Morone chrysops) is a freshwater fish of the temperate bass family Moronidae that also spawns in the Wolf River. While different fishing methods and techniques are used, the most common is the river rig (also known as the Wolf River rig). Points of interest Two towns named for the river are on the river: Wolf River, Winnebago County and Wolf River, Langlade County. See also List of rivers of Wisconsin Shawano Lake Menominee Indian Reservation References Rivers of Wisconsin Wild and Scenic Rivers of the United States Rivers of Winnebago County, Wisconsin Rivers of Forest County, Wisconsin Rivers of Menominee County, Wisconsin Rivers of Shawano County, Wisconsin Rivers of Waupaca County, Wisconsin Rivers of Outagamie County, Wisconsin