. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 674 BULLETIN OF THE BUREAU OF FISHERIES. The second group of areas as arranged in table 17 includes the north shore of Lake Michigan, the west shore of Lake Huron from Mackinaw City to Port Htu-on, and the south shore (Michigan waters) of Lake Superior. In this group the intensity of the plant of whitefish fry per square mile varies from about 5,000 to about 10,000. But two negative percentages appear in the table opposite these areas; these are both in passing from the first to the second period, and both are reversed in passing
. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 674 BULLETIN OF THE BUREAU OF FISHERIES. The second group of areas as arranged in table 17 includes the north shore of Lake Michigan, the west shore of Lake Huron from Mackinaw City to Port Htu-on, and the south shore (Michigan waters) of Lake Superior. In this group the intensity of the plant of whitefish fry per square mile varies from about 5,000 to about 10,000. But two negative percentages appear in the table opposite these areas; these are both in passing from the first to the second period, and both are reversed in passing from the second to the third period, where they become positive. The third group of areas includes the north shore of Lake Ontario, the east or Canadian shore of Lake Huron, the north shore of Lake Superior, and Georgian Bay. The plant per unit area has been largest in Lake Ontario, but has not there exceeded 3,600 per square mile. It diminishes progressively in the order in which the areas are named above, and becomes practically nothing in Lake Superior and Georgian Bay. The percentage column shows no positive value, while the sum of the negative values is very large. Table 17.—Showing the Relationship of the Average Plant of Whitefish Fry per Unit Area IN Certain Waters of the Great Lakes, to the Average Catch in the same Unit Area for Three Five-vear Periods. 1892-1896. Wliitefisli areas. (Manistee and Frankfort Lake Erie (Canadian) Lake Michigan (southeast shore) . Lake Michigan (north shore) Lake Huron (west shore) Lake Superior (south shore) {Lake Ontario (north shore) Lake Huron (east shore) Lake Superior (north shore) Georgian Bay Plant per ^^i^'^^^'- square mile (to :„-l^,^^"l^f^„,. nearest 100). ; ^'le (to^nearest 21,900 22,000 9. 000 5. 600 4. 600 3,000 J, 000 .420 94 170 990 160 880 210 5SO 310 570 Per cent of in- crease (plus values) or de- crease (minus values) of each period over the preceding period. 1897-1901. {Manistee and Frankfort Lake Eri
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