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Lake Maurepas is a slightly saline body of water located at the upper end of the Lake Pontchartrain estuary. Of 67 fish species collected during 1983-84, 33 species (49%) are primarily freshwater, 6 (9%) are primarily marine, and 28 (42%) are estuarine or diadromous, commonly occurring in both freshwater and marine habitats. Major freshwater species (e.g. lctalurus furcatus, I. punctatus, and Aplodinotus grunniens) were present throughout the year, whereas most marine and estuarine species were seasonally present (e.g. Anchoa mitchilli, Brevoortia patron us, and Micropogonias undulatus), or were present during periods of higher (up to 2.5 o/oo) salinity (e.g. Cynoscion arenarius, Leiostomus xanthurus, and Pogonias cromis). Literature records indicate that larger percentages of marine species are present during years when salinities are higher (up to 8 o/oo). Lake Maurepas is a shallow (<2.1 m), oligohaline body of water encompassing 233 sq. km. draining via Pass Manchac into the west end of Lake Pontchartrain in southeastern Louisiana (Figure 1). As with other oligohaline habitats within estuaries (Hackney and de Ia Cruz, 1981, Rozas and Hackney, 1984), its fauna has not been intensively studied. Only superficial surveys have been completed during several previous projects. Davis eta!. (1970) reported a total of 29 fish species taken from Lake Maurepas, at two otter trawl stations near the mouths of the Amite and Blind Rivers and at three trammel net stations at the mouths of the Amite, Blind, and Tickfaw Rivers. Price and Kuckyr (197 4) recorded 11 species in collections at two trawl stations in Lake Maurepas. Tarver and Savoie (1976) collected 19 species of fish at their single trawl station in Lake Maurepas, but fail· 1Rresent Address: 6518 W. Garwood Circle, Knoxville, TN 37718 •Present Address: Department of Fisheries, Louisiana State University, Baton Rouge, LA 70807 89 ed to list collections by station and generally did not distinguish between Lake Maurepas and Lake Pontchartrain. Several tributaries to Lake Maurepas have been sampled for fishes, including the Amite River (Lantz, 1970; Laiche, 1980), Blind River (Watson eta!., 1981), and Tickfaw River (Saul, 1974). Saul's (1974) collections also included one station in Lake Maurepas (near the mouth of the Tickfaw River), but collections at that station were not distinguished from those within the river. Our report presents the first comprehensive list of the fishes occurring in this major, lowsalinity portion of the estuary, and complements previous reports on fishes of the Lake Pontchartrain system.

The Fish Fauna of Lake Maurepas, an Oligohaline Part of the Lake Pontchartrain Estuary