. Il campo Canadese-naturalista. Il canadese Field-Naturalist Vol. 104. La figura . Bigmouth Buffalo, Ictiobus cyprinellus [Disegno da A. Odum da Scott e Grossman (1973) da il permesso]. Sono tuttavia al di sotto di 4,5 kg (10 lb) e a meno di 410 mm (20 pollici) in lunghezza (Smith 1979). In Canada, essi sono di solito da 254 a 457 mm (da 10 a 18 pollici) in lunghezza (Scott e Grossman 1973). La distribuzione per il Nord America: Il Bigmouth Buffalo è diffusa in tutto il Mississippi River Basin ma il solo sistema di drenaggio del versante atlantico occupato è quella dei Grandi Laghi Sistema. Si è trovato dal Lago Erie
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. The Canadian field-naturalist. The Canadian Field-Naturalist Vol. 104. Figure . Bigmouth Buffalo, Ictiobus cyprinellus [drawing by A. Odum from Scott and Grossman (1973) by permission]. however, are under 4.5 kg (10 lb) and less than 410 mm (20 inches) in length (Smith 1979). In Canada, they are usually 254 to 457 mm (10 to 18 inches) in length (Scott and Grossman 1973). Distribution North America: The Bigmouth Buffalo is widespread throughout the Mississippi River Basin but the only drainage system of the Atlantic slope occupied is that of the Great Lakes system. It is found from Lake Erie south through the Ohio and Mississippi River basins (in Ohio, West Virginia, Kentucky, and Tennessee) to the Tennessee River in northern Alabama, south through Mississippi and near the Gulf of Mexico in Louisiana, northwest through eastern Texas and Oklahoma (rare), north through Kansas, Nebraska, South Dakota and North Dakota and west to the Milk River drainage in central Montana. From Illinois in the Mississippi River drainage, it ranges northwest through western Minnesota and north in the Red River into Manitoba and west into Saskatchewan (Figure 2) (Johnson 1963; Scott and Grossman 1973; Lee et al. 1980). Recent collections place it in the Lake of the Woods, northwestern Ontario (see Canadian Distribution below). It is absent from the Lake Superior drainage (Eddy and Underbill 1974). Introduced into Arizona, it is well established in some impoundments and it also occurs in the Gila River drainage. It has been introduced into California in the Los Angeles aqueduct system as well (Johnson 1963). The Bigmouth Buffalo appears to be native to Lake Eric. A specimen was reported from Rockport, Ohio by Kirkland as early as 1854 (specimen in the Harvard Museum of Comparative Zoology). Hubbs (1930) thought it sporadically present in the Lake Eric watershed prior to 1900. C"urrcnt population levels arc likely a result of the United States (iovernment stocking of Bigmouth Buffalo