ADDENDA. 



JANUARY 1, 1900. 



GROWTH OF TROUT. 



We are always learning, and in 1899, after what I 

 have written, I went to the northwestern corner of Wis- 

 consin, up the Brule River, to take charge for a short 

 time of a large trout preserve belonging to a gentle- 

 man living in St. Louis. Fishcultural operations had 

 been going on for several years previous, and the year- 

 ling trout were only 2^ to 4 inches long; while the 

 two-year-olds would not average over 6 inches. 

 They had been well fed, but the water was cold and 

 they had not the appetites of the trout of the warmer 

 waters of Long Island. 



The springs were 43° Fahr., and the pools in sum- 

 mer never rose above 50°. These pools were made at 

 the outlet of a small pond of some 4 acres and in swift 

 water. If I should remain here, as I shall not, I 

 would make the rearing pools where there are no 

 springs, and where the ice makes thickest in winter. 

 This would give warmer water in summer and a great- 

 er consumption of food ; consequently a greater growth. 



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