Fresh Marshes (salinities less than 2 ppt) are found mostly in northern marshes of Barataria-Terrebonne near Lake Penchant, Lake Theriot, Lac des Allemands, and Lake Salvador, as well as alongside the mouths of the Atchafalaya and Mississippi rivers. Of all Louisiana marshes, fresh marshes have the highest soil organic content and accommodate the most diverse array of plant life, including such species as maidencane, bulltongue, alligatorweed, giant cutgrass, waterlilies, irises, duckweed, pennyworts, pickerelweed, and spikesedge. Fresh marshes are important habitat for overwintering waterfowl. They also serve as important nursery habitat for the young of marine species such as seatrout, croaker, blackdrum, and flounder. Fresh marshes are home to a broad range of animals—such as frogs, turtles, ducks, alligators, muskrats, mink, otters, egrets, herons, and hawks.