REPORT OF COMMISSIONER OF FISH AND FISHERIES. LV 



LKADVILLE StATIOX, COLOHAIX) (II. 1). DkAN, SUI'KHIXTENOENT). 



The operations of this station were confined to the propagation of 

 the trouts, the varieties handled being tlie black-spotted, yellow-finned, 

 brook, rainbow. Loch Leveu and Von Behr. On July 1, 1891, fish and 

 eggs as follows were on hand : 



Black-spotted trout. — On August 11, 1891, a trap was placed in Lake 

 Creek, about 1 mile from the hatchery, and kept there until the last of 

 September. During this time 543 fish, of an average length of 6 to 8 

 in(;hes, were caught and transferred to the station. The collection of 

 eggs was commenced in May. From May 10 to June 6^120,300 eggs 

 were secured from 218 stock fish, an average of 550 eggs to each fish. 

 The greatest take of eggs on one day was 36,500 on May 24. In May 

 5,100 eggs were secured from Twin Lakes; of these, about 40 per cent 

 hatched. From the same waters, through the courtesy of the Colorado 

 Fish Commission, 96,000 eggs wore taken between June 24 and 29, 

 75 per cent of which were good. Through the kindness of Gen. A. H. 

 Jones, of Denver, 121,000 eggs were obtained at Black Lake in the 

 early part 'of June. Of these about 50 j^er cent were good. The time 

 of incubation of the eggs of this trout is from twenty to thirty days. 



Brook trout. — As in })revious years, an agreement was made with Dr. 

 John Law, by which tlie Commission was to spawn his stock of fish, 

 and after furnishing him with 350,000 eggs, receive the balance secured 

 for the Leadvilje Station. The spawning season of these fish was from 

 IS^ovember 2 to January 29, during which 2,283 fish were stripped, pro- 

 ducing 672,400 eggs, the station's share being 322,400. The largest 

 number of eggs, 2i>,900, was taken November 29. The stock fish of the 

 station spawned from November 9 to December 5, 2J,000 eggs being 

 taken from 25 fish. Hatching commenced in the middle of February, 

 1892. During the last of the egg-taking season difficulty was expe- 

 rienced in finding enongli ripe males. Accordingly 21,500 eggs were 

 fertilized with the milt of the Von Behr trout. Of this lot but 2,000 

 were alive by the end of April. 



During the last week of March, when the sac was about half absorbed, 

 the fiy commenced dying rajndly. Tliey were liberally treated with 

 salt and earth, and for a short time given salt everj'^ day. In three or 

 four driys the disease was checked and the mortality was then not 

 greater than usual. The younger fry were given occasional doses of 



