Table 1. — Adult spring Chinook salmon trapped at Bonneville Dam and transferred to Carson National Fish 



Hatchery, 1955-61.^ 



Data on numbers of fish handled taken from hatchery records. 



Data from annual reports, U.S. Army Corps of Engineers. 



Included are small chinook salmon, 16-18 inches in length, usually identified as jack salmon or grilse. 



Includes 62 fish held in concrete pond. 



Does not include 3 fish which died in truck. 



Unpublished data. 



Does not include 4 fish which died in truck. 



Table 2. --Hauling mortalities, adult 

 spring Chinook saLmon, Bonneville 

 Dam to Carson National Fish Hatch- 

 ery, 1955-61.^ 



Year 



Mortalities 



1955 

 1956 

 1957 

 1958 

 1959 

 1960 

 1961 



Number 

 of fish 





 

 

 3 

 

 

 4 



Fish considered as mortalities in 

 hauling were those dead on arrival at 

 Carson National Fish Hatchery holding 

 pond. 



Artificial Propagation 



Adult holding and spawning. -- Availability of 

 two adult holding ponds at Carson hatchery, 

 one of concrete and the other of dirt, has 



permitted a comparison of the two different 

 facilities for retaining fish until they reach 

 sexual maturity. Data pertaining to operation 

 of each pond are presented. 



Dirt pond . — Prior to initiating the present 

 spring Chinook salmon transplantation study, 

 all available adult salmon holding pond designs 

 were reviewed. In general, the constructed 

 dirt pond contains many features incorporated 

 in the holding facilities at Entiat National Fish 

 Hatchery, located on the Entiat River, tributary 

 to the Columbia River, upstream from Rock 

 Island Dam. At this hatchery chinook salmon 

 are currently held for artificial propagation 

 purposes. Surface area of the dirt pond is 

 approximately 7,500 square feet. Water depth 

 is maintained at approximately 5 feet. Origi- 

 nally, the pond varied in depth from 5 feet to 

 2 feet, the sides were sloped 2-on-l, from 2 

 feet to the surface the slope was 3-on-l, and 

 above the water surface the slope was 1-on-l. 

 Due to bank slippage and erosion the pond 

 sides have stabilized at a slope of approxi- 

 mately 3-on-l. 



Water for the dirt holding pond is provided 

 from two sources: Tyee Springs and Wind River. 

 Daily maximum and minimum temperatures of 



