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NuSEDS - New Salmon Escapement Database System

Dataset homepage

Citation

Salmon Data Unit ., Fisheries and Assessment Data Section ., Baxter B (2022). NuSEDS - New Salmon Escapement Database System. Version 1.8. Fisheries and Oceans Canada. Sampling event dataset https://doi.org/10.15468/atjqs6 accessed via GBIF.org on 2025-05-14.

Description

Salmon escapement data constitute important corporate knowledge which must be adequately maintained and accessible. The Salmon Escapement Database (NuSEDS) is the DFO Pacific Region’s central database that stores individual spawner survey data records, spawner abundance estimates and the linkages between the two. Annual abundance estimates are maintained by population, as defined by freshwater location and run timing. Each population is referenced to the location of the stream mouth. The watershed-coding system provides unique stream identification and incorporates the natural organization, direction, and hierarchical nature of stream channels and their tributaries.

The NuSEDS database currently reports salmon spawning observations for 9100+ individual populations but escapement estimates (all levels of survey intensity) are available for 9800+ populations.

This database contains historic population data starting in the 1920’s (older data for some rivers exists in other formats). Prior to 1995 a standardized form (BC-16) was used to summarize the estimate of the spawning population size, but the historical database lacked the capacity to describe the number of observations, individual counts or methods used to estimate the abundance of the population. In 1995, responsibility for salmon enumeration was moved to the DFO Science section. At that time, the database was re-written to include descriptive information for each abundance estimate, providing underlying data and the estimation method(s). Many of the historic estimates prior to 1995 are labeled Unspecified Returns because the database was limited to storing one estimate for any given stock. As time and resources permit these data are being replaced with more accurate categorization. With the introduction of the Wild Salmon Policy (2005), individual populations within NuSEDS can now be grouped by Conservation Unit.

Sampling Description

Study Extent

The Salmon Escapement Database (NuSEDS) is the DFO Pacific Region’s central database that stores individual spawner survey data records, spawner abundance estimates and the linkages between the two. The dataset here only includes the escapement estimates from 1920-2020. Escapement refers to salmon that have escaped past all sources of exploitation to spawn.

Sampling

Annual escapement estimates are based on geographic locations and distinct salmon populations. Area Biologists and escapement analysts provide SIL (stream inspection logs) and SEN (summary estimate narratives) data which are uploaded or entered directly into the NuSEDS database post season. There are several standard methods to chose from to calculate the summary estimate narratives: Addition/Subtraction - simple addition or subtraction to provide an estimate. Should be used in conjunction with activity types Adjustment/Calibration and Summary observations. E.g. a population aggregate, the sum of two or more populations, would require the linking of two or more SENs and straight summation of the estimates. Multiplication/Division - simple multiplication or division to summary estimates. This method should be used in conjunction with activity type Adjustment/Calibration. E.g. An annual estimate that was arrived at by Peak Live Plus Dead analysis can be adjusted by some factor to make it equivalent to a Time Series estimate that uses AUC calculations. Area Under the Curve - Combining a series of point estimates for abundance to create an estimate for the annual abundance. This is done by determining the total area under a curve of abundance by time then dividing by the survey life (the average length of time that an individual is available to be observed alive i.e. is still within the survey area and is not dead). Peak Live Plus Dead - Examine point estimates for abundance, determine the survey when the maximum live count observed; sum the live and dead counts for that survey to create the annual estimate. Peak Live Plus Cumulative Dead - Examine point estimates for abundance, determine the survey when the maximum live count observed. Sum the live count for that survey with the cumulative total of the dead counts prior to and including that survey to create the annual estimate. Fixed Site Census - Combining one or more raw observations into a single estimate (e.g. add all daily fence observation SIL to create a single annual estimate). Mark and Recapture - Petersen - Use capture and re-capture SIL data to determine an abundance estimate with the Petersen calculation. Mark and Recapture - Jolly-Seber - Use capture and re-capture SIL data to determine an abundance estimate with the Jolly-Seber calculation. Redd Count - Using counts of redds from SILs and multiplied by a factor such as 2. Lake Expansion - expanding the dead recoveries by the recovery effort

Quality Control

Scientific names associated with resource occurrence records have been mapped to recognized standards - marine taxa have been mapped to the World Register of Marine Species (WoRMS). Standardized vocabulary and ID's are used where possible from the NERC Vocabulary Server (NVS).

Method steps

  1. This resource was created for OBIS Canada. Records were extracted from the New Salmon Escapement Database System (NuSEDS) (Salmon Data Unit, Science Branch, Pacific Region, Fisheries and Oceans Canada) and processed into DwC-A format and uploaded to the IPT using R. Scientific name matching with WoRMS was done using the R package "worrms".

Taxonomic Coverages

Pacific Salmon, including lake bound Sockeye (Kokanee), and Steelhead Trout found in spawning grounds in British Columbia and the Yukon Territory, Canada
  1. Salmo
    rank: genus
  2. Oncorhynchus
    rank: genus

Geographic Coverages

Pacific Ocean, British Columbia, Yukon Territory, Vancouver Island, Haida Gwaii

Bibliographic Citations

Contacts

. Salmon Data Unit
originator
Fisheries and Oceans Canada
. Fisheries and Assessment Data Section
originator
Fisheries and Oceans Canada
Pacific
CA
Bruce Baxter
metadata author
position: Salmon Data Biologist, Salmon Data Unit
Fisheries and Oceans Canada
CA
email: Bruce.Baxter@dfo-mpo.gc.ca
Bruce Baxter
administrative point of contact
position: Salmon Data Biologist, Salmon Data Unit
Fisheries and Oceans Canada
CA
email: Bruce.Baxter@dfo-mpo.gc.ca
Kayla Suhan
administrative point of contact
position: Salmon Data Technician, Salmon Data Unit
Fisheries and Oceans Canada
CA
email: kayla.suhan@dfo-mpo.gc.ca
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