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2. Borrom FauNA oF THE LAKES, BY CLASSES 
Class I.—Fifty-three collections from open water over 6 feet in 
depth in the. deeper all-bottom-land lakes of Class I in 1914 and 1915 
averaged 222 pounds per acre of bottom animals, after deducting shells 
of Mollusca. An average about twice as great (441 Ibs.) was shown by 
%8 collections from the 1—6-foot zone, 21 of these hauls coming from 
open bottom and having an average of 696 lbs. per acre, and 57 from 
more or less weedy bottom, with an average of 347 lbs. The average 
of the total of 131 collections from the five lakes, all depths, in both 
seasons, was 352 pounds. Forty-two of the total 131 collections were 
taken in 1914 and 89 in 1915. 
Thompson Lake, both in 1914 and 1915, easily outranked the other - 
lakes of its class studied in the richness of its bottom fauna, its average 
of over 540 Ibs. per acre, in either season, being more than double the 
best other lake average in this class, (Dogfish,) and nearly three times 
the lowest (Liverpool). 
Class II—The two sand-beach lakes (Quiver and Matanzas) 
showed a combined average for 1914 and 1915, for open water over 6 
feet, of 1,667 Ibs. per acre, for a total of 27 collections. Of these, 18 
were from Quiver Lake, with an average of 2,471 lbs., and 9 from 
Matanzas Lake, with an average of only 58 lbs. per acre. The combined 
average of 37 collections, from the 1—6-foot vegetation zone, was 251 Ibs., 
the average of Matanzas again being lower than that of Quiver. The 
general average, for the total of 64 collections, both lakes, both years, 
and all depths, was 848 lbs. per acre, or more than twice that of the 
lakes of Class I. It will be noted, however, that the very high average 
for this class and for Quiver alone, was largely due to a few enormous 
hauls of large Viviparidae in the deep “channel” in 1914. These were 
much reduced in numbers and weight per acre in 1915. 
Classes III, IV, V.—The shallow weedy lakes of Class III, Flag, 
Seebs, and Stewart, averaged only 57 lbs. per acre, combined average of 
45 collections, all depths, both seasons ; and the very shallow, very weedy 
lakes (Duck—Dennis, Crane) only 94 lbs. per acre for a total of 10 
collections. As will be shown in the next section, however, it was in 
these shallower, weedier lakes, and in other weedy backwaters, that the 
shore animals in the weeds (above the bottom) reach their highest 
figures. In the dead timber and brush areas the bottom-fauna average 
of 16 collections, 1914—1915 (187 lbs.) was better than in weedy lakes 
of Classes III and IV, approaching, in fact, the average of the open 
water of the deep lakes of the all-bottom-land type (222 Ibs.). 
