Skagit River System Cooperative, 2005. Skagit Chinook Recovery Plan: Appendix B: Linking Egg-to-Fry Survival to Chinook Recovery. Skagit River System Cooperative, La Conner, WA. pp. 29.

Freshwater habitat conditions at the intragravel life stages of salmon (deposited egg to emergedfry) can be a constraint to salmon productivity and population levels (Thorne and Ames 1987, McNeil 1966, Seegrist and Gard 1972, Lisle and Lewis 1992). Survival of salmon eggs and embryos can be influenced by physical factors such as stream flooding, streambed scour and fill, and fine sediment deposition (Lisle and Lewis 1992, DeVries 1997). This report has been written to describe our basis for watershed restoration actions presented in the Skagit Chinook Recovery Plan that improve egg-to-fry survival for Chinook salmon. We present here the methods used to calculate the estimated change in egg-to-migrant-fry survival before and after watershed restoration. Biological factors such as spawner density also affect Chinook egg-to-fry survival through competition for limited spawning habitat (Vronskiy 1972, Davis and Unwin 1989). We do not consider the effect of these possible factors on Skagit Chinook salmon in this document