. El campo canadiense-naturalista. Figura 1. Cadena, Pickerel Esox Níger, hembra de 409 mm (dibujo por A. Odum, de Scott y Grossman 1973 con permiso de los autores). Crossman (1973) señalan que la especie existe solamente en el condado de Digby, pero Boates (J. S. Boates, Recursos de Vida Silvestre, Nova Scotia, Departamento de Recursos Naturales, Kemptville, Nova Scotia; comunicación personal) indica que la especie es ahora más generalizada, aunque la amplitud de la distribución no es conocido. Se ha convertido en el río Tusket, del condado de Yarmouth, y en esas localidades ampliamente sepa- clasificado como Lily L

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. The Canadian field-naturalist. Figure 1. Chain Pickerel, Esox niger, female 409 mm (drawing by A. Odum, from Scott and Grossman 1973 by permission of the authors). Crossman (1973) state that the species exists only in Digby County, but Boates (J. S. Boates, Wildlife Resources, Nova Scotia Department of Natural Resources, Kemptville, Nova Scotia; personal com- munication) indicates that the species is now more widespread there, although the full extent of the dis- tribution is not known. It has turned up in the Tusket River, Yarmouth County, and in such widely sepa- rated localities as Lily Lake, Hants County, Black River, Kings County, and Shorts Lake Colchester County (John Gilhen, Nova Scotia Museum, Halifax, personal communication; Gilhen 1974), and also. Figure 2. North American distribution of the Chain Pickerel, Esox niger. reported in Queens and Halifax counties (Bob Bancroft, Wildlife Resources, Nova Scotia Department of Natural Resources). The species was introduced into New Brunswick (Cox 1896a, b) sometime in the 1800s. Cox (1896a) states that it was introduced into the St. John and St. Croix rivers, sometime after 1852 since the species had not been listed by Perly (1852). Scott and Crossman (1959) suggested that the first occurrence may have followed introductions into the St. Croix River in Maine about 1863. By 1970, Chain Pickerel were widely distributed in southern New Brunswick (Scott and Crossman 1959; Gorham 1970) being found in the lower St. John and St. Croix Rivers, and in the waters of Charlotte, Queens, Kings, Sunbury, and York counties, particularly in the St. John and Oromocto Rivers (New Brunswick Museum fish col- lection records, St. John, New Brunswick). Today it is more widespread and may be found almost any- where suitable habitat exists (M. Sullivan, Fish and Wildlife Branch, New Brunswick Department of Natural Resources, Fredericton, New Brunswick; personal communication). In Quebec, Chain Pickerel are found in the water- ways of th