Egg Growth Model for California Salmon: SacPAS Central Valley Prediction and Assessment of Salmon and other fishes

Egg Growth Modeling: Spawned Egg to Emerged Fry

Version 2.1.6 [2025-Jul-17]

The salmon egg growth modeling process begins with egg deposition at the time of spawning and ends with fry emergence from the gravel. Development rate and survival can be modeled by various methods to determine fry emergence from the gravel. Multiple models of egg development rate and survival are available on this webpage. The user can specify the data inputs for river temperature and redd/carcass/adult counts, as well as the model parameters. Default parameters values are from studies referenced therein.

Historical temperatures provided by CDEC. Redd and Carcass data provided by CDFW.

For more information, see the Version Details page, and the References - Notes - Data Disclaimer page.

New Content released July 17, 2025.

Temperature Data

Historical single site:

CDEC Map of AFO

Input or Upload

Use SHINY Tool to create temps.

Data in column:
Units: °C °F

Redd Distribution Data (Spawning)

Database sources

Multi-select years no longer available.
Menu items have changed slightly (July 17, 2025)

Input or Upload

Input data column:

Carcasses per redd:

Timing offset: days

Units: Redds Carcasses

General Instructions:

Make a selection for "Temperature Data" and "Spawning Data".
Either select from the dark green-blue lists, or click the radio button to choose the "Input or Upload" method to specify the input data.
Additional options to specific input data have a light green-blue background. Users can select the appropriate parent radio button to access these options.
In the "Analysis and Results Display" in the pale yellow area, users can choose to generate a query url and control formats of summary results and graphic outputs.
Below the "Analysis and Results Display" area, users can choose among temperature-dependent mortality models, density-dependence models and development-rate models.

Analysis and Results Display

Generate basic query strings or Complete query strings

Summary and graphics only. Summary, graphics and details.
Show histograms. Show cumulative.

Additional model controls below

Use redd or carcass value data set as is.

Option with database sources of Redd Distribution:

Smooth redd or carcass values. See Notes

Date Range:

If uploaded files cause errors, click "Reset" button before retrying.
Temperature profile builder. A 'SHINY' app with graphical interface and background reference data. For generating cut-and-paste temperature profiles.
Help for temperature/redd/carcass data formats.

Look-up table for day-of-year in non-leap year or Leap year

Temperature-Dependent Mortality (parameters are for °C temperatures)

Exponential

Choose default calibration:

Water Forum 2020
Zeug 2012, Cramer 2010
SALMOD 2006, USBR 2008, HCI 1996
Pre-hatch egg: α = x 10^- β =
Post-hatch alevin: α = x 10^- β =

Linear

Choose default calibration:

Martin (2016, 2017)
Anderson (2022, mortality during 4-day pre-hatching stage)
α = Daily mortality rate: per °C above critical temperature.
β = Critical temperature value °C.

Weibull-type

(Jager 2011)