NOAA-NMFS-NWFSC TM-9: Table 5

U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications

NOAA-NMFS-NWFSC TM-9: Effectiveness of Predator Removal for Protecting Juvenile Fall Chinook Salmon Released from Bonneville Hatchery, 1991

Table 5. Recovery percentages of tagged subyearling chinook salmon at Jones Beach, Tanner Creek release vs. midstream Columbia River release, 1989, 1990, and 1991.


Release date	Midstream Columbia River^a	Tanner Creek^b	Benefit for midstream release (%)^c

29 June 1989	0.43	0.26	65.4^*d
1 July 1990	0.42	0.30	40.0^*
24 June 1991	0.37	0.30	23.3^*
28 June 1991	0.39	0.33	18.2^*

^{a Fish transported by truck and barged to the middle of the Columbia River adjacent to the confluence with Tanner Creek.

^b Normal hatchery release site.

^c The percent benefit for midstream Columbia River release (MC) over Tanner Creek release (TC) is calculated as [(MC% recovery - TC% recovery) ¸ TC% recovery] x 100.

^d * = significant difference in recovery percentages for fish released in midstream Columbia River compared to fish released in Tanner Creek (P £ 0.05).

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