Data from: Dispersal of stream salmonids from nests and stocking sites: patterns, variability, and sampling bias
Data files
Jul 31, 2025 version files 97.97 KB
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Grant_and_Weir_data_sets.xlsx
81.19 KB
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README.md
16.78 KB
Abstract
To reconcile divergent views about the direction and distance that salmonids disperse from nests or release sites, we conducted a systematic search and synthesis of existing data that included 154 data points from 58 papers. After correcting for a sampling bias in the downstream direction, 56.6% of fish dispersed downstream, significantly greater than 50% but much less than expected. The best generalized linear mixed model (GLMM) explaining the percentage of fish moving downstream included a positive effect of the percentage of sampling effort downstream, a negative effect of body size, and differences among species; brown trout (Salmo trutta) tended to disperse upstream more than other species. Dispersal distance increased with body size; median dispersal distance for age 0+ and older fish was 167 m and 908 m, respectively, implying much greater mobility than expected. As predicted, median dispersal distance was greater downstream (715 m) than upstream (602 m). Our analyses indicated that many of our perceptions about salmonid dispersal are based on biased sampling – too much effort that is too close to, and downstream of, the release site.
https://doi.org/10.5061/dryad.nk98sf83n
Description of the data and file structure
Quantification of the direction and distance of movement of salmonid fishes from nests or stocking sites.
Files and variables
File: Grant_and_Weir_data_sets.xlsx (dispersal.data and dispersal.stack)
Description: dispersal.data and dispersal.stack
Variables
study: assigned a number from 1 to 58 alphabetically by first author
author: last name of first author
year of publication
species: (OC=Cutthroat Trout; OM=Masu Salmon; SF=Brook Trout; SG=Rainbow Trout; SS=Atlantic Salmon; ST=Brown Trout; TT=European Grayling)
country: where work was carried out
age: average age of fish (0+, 1+, or 2+)
age.2: 0=fish were age 0+; 1=fish were age 1+ or 2+
length: average length of fish in mm
mass: average mass of fish in g
release type: 0 Natural Redd; 1 Simulated Redd; 2 Soft Release; 3 Hard Release; 2.5 is a mix of Soft and Hard Release
stream: number assigned when multiple streams in one study
year of study: when field work was conducted
stock.day: day of year of release of fish
sample.day: day of year of sampling of fish
duration: number of days between stocking and sampling of fish
p.downstream: percentage of fish that moved out the stocking site that moved downstream
maj.downstream: 0=no; 1=yes
site.length: length of stream in which fish were released in m; 0=point stocking
p.no.disp: percent not leaving the release site; 100 for point stocking
med.dist: median distance that fish moved in either direction in m
med.sample: median sampling distance from the release site in either direction in m
p.effort: percentage of sampling effort that was downstream of the release site
med.disp.down: median distance that fish moved downstream of the release site in m
max.disp.down: maximum distance that fish moved downstream of the release site in m
med.sample.down: median sampling distance downstream of the release site in m
max.sample.down: maximum sampling distance downstream of the release site in m
med.disp.up: median distance moved upstream of the release site in m
max.disp.up: maximum distance moved upstream of the release site in m
med.sample.up: median sampling distance upstream of the release site in m
max.sample.up: maximum sampling distance upstream of the release site in m
n.release: number of fish released
n.recap: number of fish recaptured
NA: data not available from the original paper
NOTES: comments about how data were collected
Code/software
See Grant and Weir code
Access information
Data was derived from the following sources:
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We used keywords to search the Web of Science for all are articles with quantitative data on the dispersal of salmonid fishes from nests or stocking sites on October 15, 2022. We identified 247 or which 58 produced 154 data points for our analysis. We recorded information about the direction of fish movement (percentage of fish that moved upstream and downstream from the release site) and the distance of fish movement (median and maximum sampling distance and dispersal distance in each direction).