330 SEVEXTH REPORT OF THE FOREST, FISH AND GAME COMMISSION. 



also in the head waters of Feather River, west of the Sierra Nevada, probably by- 

 introduction from Nevada. 



The usual weight is 5 or 6 pounds, but individuals weighing 20 to 29 pounds are 

 recorded. 



Eggs of the Lake Tahoe, Cal., Trout were obtained by James Annin, Jr., at 

 Caledonia, N. Y., and young fish reared at his establishment were sent to the aqua- 

 rium in November, 1896. They throve till the latter part of June, 1897, when they 

 were overcome by the warm water. They could not endure a transfer to the cooler 

 salt water, like most of the other fish of the Salmon family. 



At Caledonia Station, according to Mr. Cheney, this fish begins to spawn before 

 the middle of March, and continues for two months. The impregnation of eggs is 

 from 90^p to g^%, but just before the hatching period a large number of the eggs 

 burst and the embryos are lost. There is loss too between the hatching and feeding 

 times, and the fry do not feed as readily as the Brook Trout. Altogether, Mr. 

 Annin, the superintendent of hatcheries, estimates the total loss between impregna- 

 tion of the eggs and feeding of the fry as about 40^. After the fry begin to feed 

 they are not more difficult to rear than Brook Trout. 



61. Steelhead ; Gairdner's Trout ; Salmon Trout {Salmo gairducri Richardson). 



(Introduced.) 



Salmo i^airdiicri Jordan & Gilbert, Bull. 16, U. S. Nat. Mus., 313, 1883 ; Be.\n, 

 Bull. U. S. F. C, IX, 198, pi. XLIX, fig. 9, 1891, not fig. 10, which is young mykiss; 

 Jordan & Everiiann,- Bull. 47, U. S. Nat. Mus., 498, 1896, pi. LXXXI, fig. 215, 

 igoo; Cheney, Third Ann. Rept. N. Y. Comm. Fish, 241, color pi., 189S. 



Form of 5'. salar. Body elongate, little compressed, its greatest depth two- 

 ninths of the total length without caudal ; caudal peduncle short, its least depth 

 three-sevenths of length of head ; head rather short, one-fifth of total length without 

 caudal, ma.xilla reaching far behind the eye, its length one-half the length of head ; 

 eye "small, two-thirds of length of snout, two-elevenths as long as the head ; teeth 

 rather small, vomerines in two long, alternating series about as long as the palatine 

 series; gill rakers short and stout, about 20 on the first arch, of which 12 are below 

 the angle; dorsal origin much nearer to tip of snout than to base of caudal, base of 

 dorsal two-thirds of length of head, longest dorsal ray one-half the length of head 

 and twice as long as last ray; adipose fin very small and narrow, over the beginning 

 of the anal; caudal fin moderately forked in the young; ventral origin midway 

 between tip of snout and base of caudal, ventral fin one-half the depth of body; 

 anal base one-half as long as the head, longest anal ray equal to postorbital part of 



