TWENTY-EIGHTH BIENNIAL REPORT. 37 



TAHOE HATCHERY. 



The new Tahoe Hatchery buikling was completed during the fall 

 of 1920; but since then we have not been able to construct the fore- 

 man's cottage, food preparation room and other outbuildings, or 

 improve the grounds as they should be to be in keeping with this fine 

 station. This we hope to be able to do within the next year. The 

 water system furnishing the water supply to this hatchery should be 

 remodeled and open flumes constructed from the springs to the settling 

 tanks, as well as ponds for a considerable area around the springs 

 from which this water supply has its source, in order that the water will 

 be more fully aerated and given a chance to reach a higher tempera- 

 ture. The water in these springs is very cold and conducting it through 

 pipes does not give the sun's rays a chance to warm the water to the 

 proper temperature for rapid development of trout fry. The water 

 is very pure and cold and the fry do remarkably well, but their growth 

 is retarded by the low temperature of the water. We deem it advis- 

 able to have open flumes with ripples so arranged that the water will 

 receive a higher degree of aeration than is possible in passing it through 

 the pipes, as well as giving it the benefit of the sun to raise the tempera- 

 ture. 



There were produced from this hatcherv during the last two vears 

 2,935,000 trout fry, as follows : In 1922, 975,000 rainbow trout, 480,000 

 black spotted trout, 100,000 steelhead trout, and 145,000 large lake 

 trout ; and in 1923, 445,000 steelhead trout and 790,000 large lake trout. 



MOUNT TALLAC HATCHERY. 



This station has been operated during the last two seasons under the 

 same conditions that have jirevailed during former years. We are 

 always compelled to plant the fry quite early owing to the rise in 

 temperature of the water in Fallen Leaf Lake, from which this hatchery 

 receives its supply. After the warm weather sets in the temperature 

 rises and the water numlds and algal growths have a deleterious efi'ect 

 on the fish, which necessitates planting earlier than we otherwise would. 

 However, the fish are planted in good condition and, as the water is 

 warmer from the beginning of the season than it is at some of the other 

 stations, the fish attain a good growth by the middle of July, so at that 

 time they can be planted and good results expected. We would recom- 

 mend the installation of a new" floor in this hatchery, as well as an 

 entire new" set of troughs and distributing tanks and other fixtures 

 incident to the hatchery equipment. The old equipment is now so badly 

 decayed that it is not safe for any further use in the rearing of fish. 

 This work should be done during this coming fall as soon as the trout 

 fry are out of the building. 



Traps were operated in Blackwood Creek, Ward Creek and Taylor 

 Creek during the seasons of 1922 and 1923 and eggs collected as follows : 



In 1J)22— Taylor Creek 20.5,(Xf() 



Blackwood Creek 215,01)0 



Ward Creek __— 180,000 



000,000 



In 1923— Taylor Creek — 515,000 



Blackwood Creek .590,000 



Ward Creek 640,0<X) 



1,745,000 



