. The Canadian field-naturalist. 1990 GOODCHILD: STATUS OF THE BROOK SiLVERSIDE 37 g7'^?^^.^'-v "â ";--â -'"-.â '"'â -â â .^^w-ny.' â 'â ^fe^^iiffiPjij^;^,^. Figure 1. Drawing of the Brook Silverside, Labidesthes sicculus (drawing by A. Odum; from Scott and Grossman (1973) by permission). In the United States, the Brook Silverside is found in the Allegheny River system of New York state, west to the lower peninsula of Michigan through Wisconsin and Minnesota, south to the Gulf states of Texas and Oklahoma, along the Gulf coast to peninsular Florida, and north on the Atla
. The Canadian field-naturalist. 1990 GOODCHILD: STATUS OF THE BROOK SiLVERSIDE 37 g7'^?^^.^'-v "â ";--â -'"-.â '"'â -â â .^^w-ny.' â 'â ^fe^^iiffiPjij^;^,^. Figure 1. Drawing of the Brook Silverside, Labidesthes sicculus (drawing by A. Odum; from Scott and Grossman (1973) by permission). In the United States, the Brook Silverside is found in the Allegheny River system of New York state, west to the lower peninsula of Michigan through Wisconsin and Minnesota, south to the Gulf states of Texas and Oklahoma, along the Gulf coast to peninsular Florida, and north on the Atlantic coast as far as South Carolina (Figure 2) [Scott and Grossman 1973; Lee 1980; Smith 1985]. It was first reported from the Lake Superior drainage in 1975 when it was collected in the Dead River near Marquette, Michigan, both at the mouth and 100 m upstream (Berg et al. 1975). However, Cahn (1927) had placed it in the headwaters of the Upper Fox River and Shawano Lake, Lake Michigan watershed and also in Chain- 0-Lakes, northwestern Washburn County, Mississippi River watershed, all in Wisconsin. Lack of prior records in the Lake Superior drainage suggest that it is indigenous, but very rare, or that it has recently appeared, perhaps by introduction or by migration through the locks at Sault Ste. Marie (Berg et al. 1975). Several new species have appeared in the Lake Superior drainage in the last 10 years due to ballast water introductions (G. A. Goodchild, Fisheries Branch, Ontario Ministry of Natural Resources, Toronto, Ontario; personal communication). There are few reported range extensions for this species and generally it seems to be declining in the United States. Before 1900, in Ohio, Brook Silverside were common in large streams such as the Maumee, Scioto, and possibly the Ohio River, but today are almost absent in these now turbid waters (Trautman 1981). They were formerly present in the Youghiogheny River, in southwest- ern Pennsylvania, but are now limited
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