Juvenile Survival Estimates
The following juvenile survival queries allow users to look up (1) CSS juvenile river reach survival estimates; (2) the number of fish used in the CSS analysis by source site; (3) CSS SR, TIR, and D parameters; and (4) FPC annual report survival estimates (includes SMP and CSS program data).

• Juvenile survivals

Juvenile Survival Queries

CSS Number of Fish by Site - allows the user to query the number of PIT-tagged release numbers of wild and hatchery Chinook and steelhead from various locations above LGR used in the CSS study. CSS Reach Survival Data - allows the user to query in-river smolt survival rate estimates through the hydrosystem for PIT-tagged wild and hatchery Chinook and steelhead. The Comparative Survival Study (CSS) annual estimates of survival are calculated for management oriented groups of interest. These stock specific estimates are by hatchery, basin, or run-type. All CSS estimates are on an annual smolt migration basis. Estimates for closed form Cormack Jolly Seber estimates are provided for all reaches with non-parametric bootstrap confidence intervals. Generally, longer reach estimates are preferred over shorter reach estimates. For example, a Lower Granite to Bonneville estimate incorporates much more information and can be a more robust estimate of annual survival than from a shorter reach (e.g. John Day to Bonneville). Reach estimates with a coefficient of variation of more than 25% or that exceed 100% should be used with caution; typically, those estimates were found to be unreliable and excluded from analyses. CSS SR, TIR, and D - allows the user to query SR, TIR, and D parameters. SR is the survival of fish migrating entirely in-river from LGR dam to below BON. Smolt to Adult Return ratio (SAR) is the survival from a beginning point as a smolt to an ending point as an adult. SARs are calculated from LGR to LGR and can also be estimated at BON to BON or LGR, or below BON to BON. TIR is a ratio of SARs that relates survival of transported fish to inriver migrants. The ratio is the SAR of fish transported from LGR to BON and returning as adults, divided by the SAR of fish outmigrating from LGR to BON and returning to LGR as adults. D is the estuary and ocean survival rate of Snake River transported fish relative to fish that migrate inriver through the FCRPS. It is a ratio of SARs similar to the TIR, except the starting point for juvenile outmigrating fish is below Bonneville Dam. FPC Annual Report Survival Estimates - allows the user to query survival estimates reported in the FPC Annual Reports. The majority of the Smolt Monitoring Program (SMP) survival estimates are calculated for evaluation of hydrosystem effects in particular reaches on aggregate PIT-tag populations. These aggregates incorporate all available PIT tags to estimate survival for the run-at-large. Reach survival estimates are divided into short time intervals so that environmental effects such as flow, spill and temperature can be evaluated in relation to survival. Additionally in a few cases, survival is estimated for specific SMP releases of interest such as from large traps or other smolt monitoring facilities (e.g. Snake River Trap or Rock Island Dam). Releases from these specific sites of interest are on an annual smolt migration basis. Survival estimates were generated using the program Mark. Reach estimates with a coefficient of variation of more than 25% or that exceed 100% should be used with caution. Typically, FPC found those estimates unreliable and excluded them from analyses.

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Page design last updated on: June 7, 2011

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