FISHERY BULLETIN: VOL. 79, NO. 3 



Adult Trapping and Hauling 



At the time the Wind River spring chinook 

 salmon introduction was initiated, artificial prop- 

 agation of all salmon within the Columbia Basin 

 was generally ineffective and virtually nonexis- 

 tent for spring chinook salmon. Lacking a conve- 

 nient source of nonindigenous juvenile or adult 

 spring chinook salmon for transplantation to the 

 Wind River, researchers decided to trap adults for 

 brood stock from the heterogenous population 

 passing Bonneville Dam enroute to various up- 

 river tributary spawning areas. 



A specially designed trap similar to that de- 

 scribed by Gunsolus and Eicher^ was installed at 



'Gunsolus, R. T.,andG. J. Eicher. 1962. Evaluation of fish 

 passage facilities at the Pelton Project on the Deschutes River in 

 Oregon. Oregon Department of Fish and Wildlife Research and 

 Management Laboratory, 17330 SE Evelyn St., Clackamas, OR 

 97015, 133 p. 



the fishway on the north side of Bonneville Dam. 

 The trap basically consisted of a hopper which was 

 lowered into the fishway to intercept and collect 

 upstream migrants. Once several adult spring 

 chinook salmon had entered the hopper, it was 

 raised from the fishway, positioned over and 

 emptied into a 1,000-gal capacity tank truck 

 previously filled with water from the fishway 

 (Figure 4). This process was repeated until each 

 truck held approximately 20 adult fish. During 

 the loading operation, water in the truck tank 

 was continually being drawn from the fishway, 

 circulated through the tanks, and released to 

 the forebay of the dam. Water in the tank was 

 mechanically aerated during the approximately 1 

 h transportation time to Carson Hatchery. At the 

 hatchery, the tank trucks were emptied into adult 

 holding ponds. The fish were retained in water 

 throughout the trapping and hauling operation. 





Figure 4. — Transfer of adult spring 

 chinook from hopper of fishway to tank 

 truck for transport to Carson Hatchery. 



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