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Title: Evaluation of Fall Chinook and Chum Salmon Spawning below Bonneville Dam; 2002-2003 Annual Report.

In 2002 a total of 364 adult fall chinook and 472 chum were sampled for biological data in the Ives and Pierce islands area below Bonneville Dam. Vital statistics were developed from 290 fall chinook and 403 chum samples. The peak redd count for fall chinook was 214. The peak redd count for chum was 776. Peak spawning time for fall chinook was set at approximately 15 November. Peak spawning time for chum occurred approximately 6 December. There were estimated to be a total of 1,881 fall chinook spawning below Bonneville Dam in 2002. The study area's 2002 chum population was estimated to be 4,232 spawning fish. Temperature unit data suggests that below Bonneville Dam 2002 brood bright stock, fall chinook emergence began on February 3 2003 and ended 7 May 2003, with peak emergence occurring 20 April. 2002 brood juvenile chum emergence below Bonneville Dam began 27 January and continued through 6 April 2003. Peak chum emergence took place 1 March. A total of 10,925 juvenile chinook and 1,577 juvenile chum were sampled between the dates of 24 January and 21 July 2003 below Bonneville Dam. Juvenile chum migrated from the study area in the 40-55 mm fork lengthmore » range. Migration of chum occurred during the months of March, April and May. Sampling results suggest fall chinook migration from rearing areas took place during the month of June 2003 when juvenile fall chinook were in the 65 to 80 mm fork length size range. Adult and juvenile sampling below Bonneville Dam provided information to assist in determining the stock of fall chinook and chum spawning and rearing below Bonneville Dam. Based on observed spawning times, adult age and sex composition, juvenile emergence timing, juvenile migration timing and juvenile size at the time of migration, it appears that in 2002 and 2003 the majority of fall chinook using the area below Bonneville Dam were of a late-spawning, bright stock of fall chinook. Observed spawning times, adult age and sex composition, GSI and DNA analysis, juvenile emergence timing, juvenile migration timing and juvenile size at the time of migration suggests chum spawning and rearing below Bonneville dam are similar to stocks of chum found in Hamilton and Hardy creek and are part of the Lower Columbia River Chum ESU.« less
Authors:
; ;  [1]
  1. (Oregon Department of Fish and Wildlife, Columbia River Section, John Day, OR)
Publication Date:
OSTI Identifier:
891287
Report Number(s):
DOE/BP-00004028-3
R&D Project: 199900301; TRN: US200621%%726
DOE Contract Number:
00004028
Resource Type:
Technical Report
Research Org:
Bonneville Power Administration (BPA), Portland, OR
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
13 HYDRO ENERGY; 54 ENVIRONMENTAL SCIENCES; ADULTS; COLUMBIA RIVER; DNA; EVALUATION; JUVENILES; REARING; SALMON; SAMPLING; STATISTICS; STREAMS Chum salmon - Spawning - Columbia River; Chinook salmon - Spawning - Columbia River