Spawner Trend Browser

Select Species


Number of Populations

Major Population Group
Trend: End Year: Target Reference:  Wild Only
 No Jacks
Population Ordering:    Pop Bar Width
Trend: End Year: Target Reference:  Wild Only
 No Jacks
   Scale Maximum

Data Sources

Spawner estimates for these visualizations were obtained from the following sources:

Data for CAX has been submitted by Federal, State, and Tribal agencies represents the current accepted spawner estimates. However, not all available data has been entered, and therefore theis has been supplemented by data from SPS (usually older data) and from data provided directly by the Nez Perce Tribe. Note that there may be difference in methodology and population coverage between data sets, and this should be considered in analyzing timeseries for the populations. See disclaimers below.

Color-coded identification of the specific data source used for each population is available under the Metadata tab, selecting Dataset in the Color dropdown menu above the chart.


CAX Attribution and Disclaimer:
Data provided in the CAX DES is from the co-managers. CAX data submission do not guarantee that the information meets the VSP method requirements to be used by NOAA but is the best available science from the provider. Ongoing QA/QC may be necessary to ensure CA data has all co-manager buy in to be official data. The SPS data may be the system of record of data if the co-managers have not bought off on CA data. By 2018 it will be believed that the CAX with be the system of record for indicator data sets moving forward.

SPS Attribution and Disclaimer:
Due to the wide variety of data sources the go into the Salmonid Population Summary (SPS) database, the NOAA Northwest Fisheries Science Center (NWFSC) does not guarantee the accuracy of any of the data in the SPS database. In particular, neither the U.S. Government, nor any agency or employee thereof, makes any warranties, expressed or implied, with respect to the accuracy of the data, including but not limited to the implied warranties or merchantability and fitness for any particular purpose. In no event shall the U.S. Government, nor any agency or employee thereof, be liable for any direct, indirect, or consequential damage flowing from the use of the data in the SPS database.

NPT Escapement Attribution and Disclaimer:
Provisional data provided directly to BPA April 2019. Please consult NPT before data use:
Kinzer R., Hesse, J. and Vogel, J., Nez Perce Tribe Department of Fisheries Resources Management Provisional data pending publication to Coordinated Assessments.
Download spreadsheet here

NOAA ESA Recovery and Delisting Disclaimer:
Based on TRT Rule set it is not necessary to achieve minimum abundance viability thresholds for every population.
The Delisting Abundance Threshold Low Recovery (DATLR) value presented to delisting are the Minimum Abundance values identified in recovery plans as likely to occur during the Federal Register Notices. In a special case For Mid Columbia Steelhead Populations recovery plans called out Minimum Abundance values using the TRT viability curves had a value of approximately 100 for the lowest abundance relative to the 100 Extinction risk curve, unless specified in the recovery plan as a different value.


The Spawner Trend Browser is still in development and we welcome your feedback. Please send comments to:
Brian Maschhoff.

Support for development was provided by the Bonneville Power Administration.

Bonneville Power Administration Salmonetics Hinrichsen Environmental

Browser Requirements

  1. A reasonably recent browser (Chrome, IE, Firefox, Opera, Safari)
  2. At least 1280 horizontal pixels in browser window. Decrease magnification if necessary

How to Interpret

  • Mean spawner abundances for each population, relative to (i.e. divided by) the selected abundance target, for the most recent time span (e.g. 2009-2013) are shown via the horizontal black bar.
  • The change in abundance from one time span to the next is depicted with the inner arrows (green for increasing, red for decreasing) where the position of the arrow tail indicates the mean relative abundance for the earlier time span and the arrow head the later time span. This is shown in the figure below for a Bear Valley Creek Chinook trend. The upper chart displays the time series of abundance estimates. The 5-year geometric mean abundance for each of two sequential five year time span (2004-2008 and 2009-2013) are indicated with the gray horizontal lines.

    The black line denotes a running 5-year geometric mean, and thus the mean for a five year time span is equal to the value for the fifth year of the span. The mean abundance values and the abundance target are mapped to the trend chart as shown with the red arrows.
  • Displayed to the right of each trend are the actual spawner abundance and target values (the latter in parentheses).

Usage Hints

  • The populations are sorted alphabetically by ESU (DPS), then by Major Population Group (MPG), and finally by relative abundance. With the Reorder option checked, populations are reordered upon changing the Trend or Target options. To maintain the current order, uncheck.
  • The left and right arrows on the x-axis scale at bottom increase or decrease the plotted range (starting at zero).