American Fisheries Society 197 



fish {Coregomis cliipeaformis), white sucker {Catostomns- 

 commersonii), wall-eyed pike {Stisostedion vitreum), 

 perch {Perca flavesccns), and straw-colored minnow 

 {Notropis blcnnius). This list certainly does not include 

 all species present on account of the difficulty of making 

 collections from such deep water. Lake trout have been 

 planted in Walnut Lake by the Bureau of Fisheries and by 

 the Michigan Fish Commission. Some have been captured 

 since these plantings, but we were unsuccessful in getting 

 them with our gill nets and fyke nets. Whitefish appear 

 to be common here at all depths. Some forty specimens of 

 them weighing from L5 to 2.5 pounds were caught by us. 

 White suckers were found with whitefish in water as deep 

 as 80 feet but appeared most numerous in less than 40 feet. 

 Only one wall-eyed pike was taken in this abyssal region. 

 This was caught in late summer from 45 feet and was of 

 good size, measuring 2 feet long. Perch appeared to be 

 sporadic in their distribution here, for only once were they 

 taken in many settings of the fyke net, and then about a 

 hundred were caught from 45 feet of water. Schools of 

 their young had a pelagic habit, and were sometimes seen 

 near the surface of the deep water. Young minnows were 

 also noticed in such situations in August forming immense 

 schools. Some of these collected were straw-colored 

 minnows. 



The whitefish and suckers were competing for the red 

 midge larvae which constituted the main food of both these 

 fishes in deep water in April and May, during which time 

 we made our collections of fishes in the region and examined 

 the stomach-contents of those caught. The only other time 

 that collecting was done here was between August 6th and 

 18th, and we were surprised to find the 9 whitefish then 

 taken to have eaten only entomostracans. chiefl)^ Daphnia. 

 The suckers were still eating midge larvae but also consider- 

 able numbers of entomostracans similar to those found in 

 the whitefish at the time. This change of food on the 

 part of the whitefish could not be correlated with any 



