ADDENDA. 



JANUARY 1, 19OO. 



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. 



