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u <br />NORTHERN PIKE (Esox Lucius-Linnaeus) <br />HABITAT USE INFORMATION <br />General <br />Northern pike (Esox Lucius) occur worldwide in fresh waters north of <br />40° N (Toner and Lawler 1969). It is the only species in the esocid family <br />.native to both North America and Eurasia (Scott and Grossman 1973). The <br />native North American range included Alaska, most of Canada south of the <br />Arctic Circle (excepting most of British Columbia), the Missouri River <br />drainage, the Mississippi River drainage upstream of the confluence with the <br />Missouri, the Ohio River drainage in Pennsylvania and New York, and the Great <br />Lakes drainage basin; the southern limit was probably in central Missouri <br />(Grossman 1978). Northern pike distribution has expanded with their introduc- <br />tion into impoundments outside of their native range, most commonly in Great <br />Plains and Rocky Mountain States (McCarraher 1961; Carlander et al. 1978). <br />Lakes account for most of the North American habitat of northern pike <br />(Carlander et al. 1978; Grossman 1978). <br />Age, Growth, and Food <br />Growth rate of northern pike is highly variable, both among and within <br />populations. There is a general inverse relationship between growth rate and <br />north latitude over a latitudinal gradient spanning the United States and <br />Canada (Miller and Kennedy 1948; Crabtree 1969; Vasey 1974), but the trend is <br />not always 'strongly defined over limited geographic areas (Diana, pers. comm.). <br />Temporal variability in growth rate, associated with changes in density of <br />northern pike and likely prey species, has also been noted (Kempinger and <br />Carline 1978). Individual growth rates can vary considerably within a single <br />cohort. Young of the year northern pike, stocked as fry in a Michigan rearing <br />pond in early May and recovered the following October, ranged in length from <br />8.3 to 44..6 cm (Carbine 1945). <br />The age at which northern pike become sexually mature depends on their <br />growth rate. Male northern pike are typically 34 to 42 cm (total length) and <br />females 40 to 48 cm when they spawn for the first time (Frost and Kipling <br />1967; Priegel and Krohn 1975). Ih Great Bear Lake (Northwest Territories), <br />this translates to age 5 or 6 for males and age 6 or 7 for females (Miller and <br />Kennedy 1948). In Wisconsin, age 2 (males and females) is more typical <br />(Priegel and Krohn 1975). One-year old spawners are not unusual in Kansas <br />(Schryer et al. 1971), Missouri (Uasey 1974), and Texas (Crabtree 1969) <br />reservoirs, where growth is rapid. <br />L` <br />