DOI: 10.5061/dryad.nk98sf83n
title: Data from: Dispersal of stream salmonids from nests and stocking sites: patterns, variability, and sampling bias

description: 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.
description: 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).
description: # Raw data for: Dispersal of stream salmonids from nests and stocking
 sites: patterns, variability, and sampling bias
 [https://doi.org/10.5061/dryad.nk98sf83n](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: 1\. 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