Fishery bulletin of the Fish and Wildlife Service - NOAA

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342 FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE the four consecutive years, 1929-1932 (table 15), may well have contributed to the sharp decline in abundance in 1933 (table 21). Similarly, in other districts the declines in abundance that followed years of increased fishing intensity and high yields might have been less severe had the fishery of the preceding years been less intensive. The actual detection of the possible effects of high production on the abundance of whitefish in later years is difficult, since in Lake Michigan as in Lake Huron a decline from the peak of abnormal abundance was to be anticipated whether or not extensive overfishing occurred. Furthermore^ the data for Lake Michigan do not provide the sharp contrasts that made the presence and effects of overfishing in Lake Huron so easy to detect. (Compare especially the annual fluctuations in the production and fishing intensity in the various districts of the two lakes—figs. 5-10 for Lake Huron and 13-20 for Lake Michigan.) 5 Ui ISO Q % í О Ъ l S 3 J t í J S CALENDAR УЕЛИ FIGURE 14,—Second district, M-2. 1933 1935 C A L C H O A O tf E A R FIOVKI 15.—Third district, M-3. I I I I 1933 I 9 J S C A L E N D A R У E A R FIQUEI 16.—Fourth district, M-4. I О О О Q о ï * а
. * - гоо WHITEFISH FISHERY OF LAKES HURON AND MICHIGAN 343 I 9 J 3 l в 1 S CALE HD AR YEAR Flamm 1?.—Fifth district, M-5. I I ï e ï j i я i s CALENDAR V f Л Я Риивя 18.—Sixth district, М-в. |_ I I I t s í j t я 3 s \ C A L £ ND л R Y f Л R FIOURI 19.—Seventh district, M-7, \ O k ,~ ° f V V ÇJ ^ ;a ICO *• % o k
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UNITED STATES DEPARTMENT OF THE INT
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UNITED STATES DEPARTMENT OP THE INT
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ABSTRACT The results of an investig
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2 FISHERY BULLETIN OF THE FISH AND
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14 FISHEBY BULLETIN OF THE FISH AND
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20 FISHERY BULLETIN OF THE FISH AKD
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Fish and Wildlife Service, Fishery
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32 FISHEKY BULLETIN OF THE FISH AND
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68 Centime tf гз 28 3l ,.-.-- 32
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72 TABLE 18.- FISHERY BULLETIN OF T
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ABSTRACT Plankton collections made
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ABSTRACT T7XCEPTIONAL DATA are avai
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ABSTRACT This portion of a comprehe
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UNITED STATES DEPARTMENT OF THE INT
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FLUCTUATIONS IN ABUNDANCE OF RED SA
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Cold Creek« Spring Creek Moraine C
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1 2 3 4 . 1 2 3 4 Age of seaward mi
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