. Bulletin. Natural history; Natural history. 514 Illinois Natural History Survey Bulletin Vol. 22, Art. 7 monthly reports for the muskrat catch per effective fur-taker varv from 22 to 11^ table 2. For the 1^38-39 and 1939- 40 seasons, they are respectively 7 and 10 points lower than the figures for catch per effective fur-taker as derived from data collected by Brown; the average dif- ference is about 9 points. If similar correlations, or differences, between figures derived from the oral sur- vey and the written monthly reports pre- vailed before the 1938-39 season, we may assume that in the
. Bulletin. Natural history; Natural history. 514 Illinois Natural History Survey Bulletin Vol. 22, Art. 7 monthly reports for the muskrat catch per effective fur-taker varv from 22 to 11^ table 2. For the 1^38-39 and 1939- 40 seasons, they are respectively 7 and 10 points lower than the figures for catch per effective fur-taker as derived from data collected by Brown; the average dif- ference is about 9 points. If similar correlations, or differences, between figures derived from the oral sur- vey and the written monthly reports pre- vailed before the 1938-39 season, we may assume that in the seasons covered by this report, ending with 1939-40, approxi- mile for the 1938-39 and 1939-40 seasons is recorded in table 6 of the Brown & Yeager report. MINK Distribution.—The distribution of the mink catch, fig. 6, shows considerable ir- regularity. Several centers of abundance are apparent, one being in Lake County and another in Schuyler County. Gen- erally, however, minks are moderately abundant in the northeastern quarter and the western half of Illinois. The largest. Fig. 5.—Muiskrat caught in Champaign County. No furbearer occurs in greater numbers in Illinois than the muskrat. Nor do all of the state's other furbearers combined yield as great an annual cash return. mately 18,375 fur-takers caught muskrats annually in the state. The annual catch of muskrats is calculated to have been 745,000 during the 1929-30 season and and 664,831 during the 1938-39 and 1939-40 seasons, respectively; figures for the last two seasons are from table 6 of the Brown & Yeager report. The average annual catch is estimated at about 653,000 muskrats. Income is estimated to have averaged around $500,000 annually. Averages are for the seasons of this study ending with 1939-40. These averages indicate about 1 musk- rat trapper to 3 square miles, or roughly 180 trappers per county; about 12 musk- rats caught per square mile, or approxi- mately 6,400 per county; and $9 worth
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