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Major Lakes in the Wisconsin River Basin <br /> Fish Lake* <br /> Fish Lake is a 102 hectare seepage lake occupying a valley of glacial <br /> outwash and alluvium in northwestern Dane County. The drainage basin <br /> is small with no distinct inlet or outlets; groundwater is the major <br /> source of water to Fish Lake. Basic hydrographic and morphometric data <br /> are as follows: <br /> Surface Area 102 ha <br /> Volume 5. 16 x 106 m3 <br /> % of Lake < 3 ft. 10 <br /> % of Lake > 20 ft. 60 <br /> Maximum Depth 19 m <br /> Mean Depth 6 m <br /> The aquatic macrophyte community is quite extensive in Fish Lake and <br /> is dominated by dense stands of Myriophyllum and Ceratophyllum. A <br /> species list of known aquatic macrophytes is presented in Table <br /> TABLE : MACROPHYTES REPORTED PRESENT IN FISH LAKE <br /> Myriophyllum Milfoi1 <br /> Ceratophyllum demersum Coontail <br /> Najas flexilis Bushy Pondweed <br /> Potamogeton zosteriformis Flatstem Pondweed <br /> Scirpus sp. Bulrush <br /> Typha sp. Cattail <br /> Nuphar variagatum Yellow water lily <br /> Nymphae tuberoso White water lily <br /> Eleocharis sp. Rush <br /> Polygonum sp. Smartweed <br /> The littoral sediments are comprised principally of silt and muck. While <br /> the extent of the macrophyte growth is probably the most serious problem <br /> restricting the recreational potential of Fish Lake (no motor boats are <br /> allowed) , property owners have resorted to sand blankets in localized <br /> areas to control macrophytes. However, extensive growths of aquatic <br /> macrophytes remain and often compete with phytoplankton for available <br /> nutrients, thereby reducing the occurrence of excessive algae blooms <br /> (Hasler & Jones, 1949) . <br /> * Background material provided by Steven Mace, Wisconsin DNR. <br /> ** From Wisconsin Department of Natural Resources surveys, not necessarily complete. <br /> B-100 <br /> r <br />