Comparative Survival Study (CSS) of Hatchery PIT-tagged Spring/Summer Chinook; Migration Years 1997-2002 Mark/Recapture Activities and Bootstrap Analysis, 2003-2004 Biennial Report.
The Comparative Survival Study (CSS) was initiated in 1996 as a multi-year program of the fishery agencies and tribes to estimate survival rates over different life stages for spring and summer Chinook (hereafter, Chinook) produced in major hatcheries in the Snake River basin and from selected hatcheries in the lower Columbia River. Much of the information evaluated in the CSS is derived from fish tagged with Passive Integrated Transponder (PIT) tags. A comparison of survival rates of Chinook marked in two different regions (which differ in the number of dams Chinook have to migrate through) provides insight into the effects of the Snake/Columbia hydroelectric system (hydrosystem). The CSS also compares the smolt-to-adult survival rates (SARs) for Snake River Chinook that were transported versus those that migrated in-river to below Bonneville Dam. Additional comparisons can be made within in-river experiences as well as comparison between the different collector projects from which smolts are transported. CSS also compares survival rates for wild Snake River spring and summer Chinook. These comparisons generate information regarding the relative effects of the current management actions used to recover this listed species. Scientists and managers have recently emphasized the importance of delayed hydrosystem mortality to long-term managementmore »
- Publication Date:
- OSTI Identifier:
- Report Number(s):
R&D Project: 199602000; TRN: US200617%%582
- DOE Contract Number:
- Resource Type:
- Technical Report
- Research Org:
- Bonneville Power Administration (BPA), Portland, OR
- Sponsoring Org:
- Country of Publication:
- United States
- 13 HYDRO ENERGY; 24 POWER TRANSMISSION AND DISTRIBUTION; 54 ENVIRONMENTAL SCIENCES; ADULTS; COLUMBIA RIVER; DAMS; EVALUATION; GRANITES; HYPOTHESIS; MANAGEMENT; MONITORING; MORTALITY; POWER SYSTEMS; RIVERS; TESTING; TRANSPORT Chinook salmon - Snake River Watershed (Wyo.-Wash.) - Mortality; Hatchery fishes - Mortality
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