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Upstream Migration Timing

To determine stock-specific timing, age composition, length-at-age composition, and survival of sockeye, chinook, and steelhead passing Bonneville Dam.

Bonneville Dam

Bonneville Dam, where adult fish are sampled to obtain scale and genetic samples, lengths, and other biological information.

Project Goal

To determine stock-specific timing, age composition, length-at-age composition, and survival of sockeye, chinook, and steelhead passing Bonneville Dam.

Impacts

This project will lead to more accurate escapement estimates, run forecasting, and improved harvest and hydro management.

Background

In 1985, the US-Canada Pacific Salmon Treaty was signed to manage research and enhance Pacific salmon. The treaty established the Spawning Escapement-Monitoring program to assess indicator stocks within the Columbia River Basin and improve methods for providing population estimates, escapement monitoring, establishing spawner-recruit relationships and developing harvest management approaches. The Bonneville sampling program was initiated to satisfy this research need by providing length, age and stock composition information for sockeye salmon since 1985, spring chinook salmon since 1987, summer Chinook salmon since 1990, and up-river bright fall chinook salmon since 1998. Similar escapement information is also required for U.S. v. Oregon’s Technical Advisory Committee for all salmon species and in 2004 steelhead were added to our sampling regime. PIT tagging of sockeye salmon was added in 2006, chinook salmon in 2007, and steelhead in 2009. PIT tagging was funded by PSC prior to 2009 before becoming an MOA project.

Project Tasks

  1. Sample adult chinook, sockeye, and steelhead at the Bonneville Dam adult fish facility to obtain scale and genetics samples, lengths, and other biological information.
  2. Implant PIT tags in chinook, sockeye, and steelhead sampled.
  3. Track PIT tagged fish through the system of PIT tag receivers throughout the Columbia Basin.

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