Title: Ecology of Yearling and Subyearling Salmonids in Shallow Tidal Freshwater Habitats in the Vicinity of the Sandy River Delta in the Lower Columbia River

Abstract:  This study will 1) provide basic data on the migration characteristics and ecology of yearling and subyearling salmonids in tidal freshwater habitats in the vicinity of the Sandy River delta in the lower Columbia River ; and 2) assess feasibility to apply acoustic telemetry technology for action effectiveness research  and quantify residence times and migration pathways in shallow, tidal freshwater habitats.  The Sandy River delta and vicinity was chosen as the study area because it is in the tidal freshwater area of interest (RM 110-146), there is a major habitat restoration project ongoing there with potential for significant restoration of shallow water habitat for juvenile salmonids, the area was mandated in the Action Agencies’ Implementation Plan for the Updated Proposed Action, and it is likely to be included in the forthcoming 2007 Biological Opinion because of relatively high mortality rates below Bonneville Dam.  Research on juvenile salmonid ecology in tidal freshwater is also called for in the Northwest Power and Conservation Council’s Lower Columbia Subbasin Plan and draft Research Plan.  We propose to use a shallow (0-2 m) beach seine to sample fish within three of the most common shallow tidal freshwater habitats: river confluence floodplain, shallows, and mainstem island.  This is not a pilot study for an estuary-wide research, monitoring, and evaluation program.  The study will perform status and trends monitoring and uncertainties research on yearling and subyearling salmonids in tidal freshwater and develop protocols for action effectiveness research.  We will substantively coordinate and integrate our results with other relevant studies in the lower Columbia River and estuary (LCREP).