22 REPORT OF STATE BOARD OP FISH COMMISSIONERS. 



The output of fish from Sisson Hatchery for the last two years, from October 1, 1904, 

 to October 1, 1906, is as follow- : 



1905. 



Salmon fry.... 87.000,000 



Cut-throat trout fry 250,000 



steelheadfry 108,000 



Sunfish 1,040 



Shiners 200 



Eastern Brook trout fry, 1', to 3 inches in length ... 460,000 



Eastern Brook trout fry, Two years old 5.200 



Eastern Brook trout fry, one year old 9.200 



Rainbow trout fry, 1% to 2% inches in length 596,000 



Loch Leven trout fry. - 168,000 



Total 88,597,640 



1906. 



Salmon fry 96,550,000 



Grayling fry 150,000 



Rainbow trout, two years old. _. 1,600 



Rainbow trout, one year old 8,000 



Rainbow trout fry, \)4 to 2% inches in length 937,000 



Eastern Brook trout, one year old 9,000 



Eastern Brook trout fry, \yi to 3 inches in length 600,000 



Loch Leven trout fry, 1}^ to 2 inches in length 219.000 



Loch Leven trout, one year old 2,000 



Loch Leven trout, two years old 1,600 



Land-locked salmon fry 6,000 



Sunfish 1,000 



Total 98,485,200 



Making a grand total of 187,082,840. 



In June, 1904, we received a shipment of 100,000 Grayling eggs from Bozeman, Mon- 

 tana. They arrived in good order, and in due time hatched out. They were the first 

 Grayling eggs ever brought to California, and we were not prepared to handle them 

 properly. Dr. Henshal. Superintendent of the Bozeman Station, kindly sent me instruc- 

 tions in regard to the best method of hatching and rearing them. They are naturally 

 a very delicate egg and produce a great many weak embryos that are very hard to raise 

 and if placed in the ponds with the others soon fall a prey to the predatory habits of 

 the more precocious ones. This habit seems to change to a great extent as they get 

 older. After they are a few months old they do not appear to be any more predatory 

 than the trout. We placed the young Graylings in a pond where there was a good sup- 

 ply of fresh water, and we succeeded in raising about 7,000 of them until they were 

 about a \ T ear and a half old, w 7 hen they became restless and uneasy and made frantic 

 efforts to escape from the pond. I examined them closely, but could not find anything 

 wrong with them. There were no signs of any sporadic disease. The pond was clean 

 and the water pure. They would work night and day at the screens in their mad efforts 

 to escape. The current of w.'.ter at the inlet was changed so that they could not get 

 near the screens, and the number of shades or floats increased so that they could keep 

 entirely hidden if they wanted to, but to no avail. Shortly afterwards they quit feeding 

 and in a few weeks began to get diseased and die. We gave them what appeared to be the 

 proper treatment, and did all in our power to arrest the disease, but within two months 

 they all died except 600. Knowing of the failures of others who had tried to raise them 

 in artificial ponds, particularly in some of the Northwestern States, where nearly all 

 attempts to raise them on artificial food had failed, I concluded that they, like the trout, 

 must return to nature until we can get them domesticated. I accordingly built a pond 

 on a piece of swamp land on the lower end of the hatchery grounds, and turned a 

 stream of water into it from the creek. All the grass, rushes, and brush were left in 

 the pond, which covers a half acre of ground. The Graylings were then placed in 

 the pond, shortly after they began to improve from the epidemic, where they became 

 contented, and have been in perfect condition ever since. At this date, October 1st, ten 



