Rainbow trout growth data and growth covariate data downstream of Glen Canyon Dam in the Colorado River, Arizona, 2012 - 2016

These data are the primary data used to estimate rainbow trout abundance and survival in the Colorado River, Glen and Grand Canyons. Refer to the analyses as per the associated journal manuscript (see Larger Work Citation). Prey availability, feeding efficiency, and competition reduce somatic growth and cause the collapse of a fish population" Nighttime boat electrofishing was used to sample rainbow trout four times per year in April, July, September, and January, from April 2012 through September 2016. A total of five reaches were sampled between Glen Canyon Dam (river kilometer [rkm] 0) to below the confluence with the Little Colorado River (located at rkm 130). Reaches ranged from two to six km in length. A total of 47,056 individual rainbow trout were tagged with passive integrated transponders (PIT) over the first 18 trips across the five study reaches. and 7,733 of these individuals were recaptured one or more trips after they were released. A total of 1,477 individuals (19%) were recaptured more than once (i.e., on two or more trips after release). In total, 9,542 across-trip recaptures with length and weight measurements on release and recapture events were obtained. Very few tagged fish were recaptured in reaches other than the ones they were released in, and these fish were excluded from the analysis. Provided are tabulated data for fish capture (158,324 records), size-stratified abundance estimates by reach and sampling trip, and the upper and lower confidence intervals for total abundance. We evaluated the effects of discharge, water temperature, solar insolation, turbidity-driven reactive distance (feeding efficiency), intraspecific competition, and prey availability on growth rates of rainbow trout. These six covariates were selected based on hypotheses of how they affect the rate of prey delivery, metabolic and foraging costs, foraging efficiency, and prey availability. Covariates are compiled as tabulated mean values for each reach and sampling trip and corresponding data sources.

本数据集为科罗拉多河格兰峡谷与大峡谷区域虹鳟种群丰度及存活率的估算提供核心原始数据。相关分析请参见配套期刊论文（详见大型文献引用条目）。猎物可获得性、摄食效率与种内竞争会抑制个体躯体生长，并可能引发鱼类种群崩溃。2012年4月至2016年9月期间，研究团队于每年4月、7月、9月及1月开展4次夜间船载电捕鱼采样以获取虹鳟样本。采样范围覆盖格兰峡谷大坝（河流公里标[rkm] 0）至小科罗拉多河汇流处下游（rkm 130）的共计5个河段，各河段长度介于2至6公里之间。在针对5个研究河段的前18次采样航次中，研究团队共计为47056尾虹鳟个体植入了被动集成应答器（passive integrated transponders, PIT）；其中7733尾个体在放流后至少1次采样航次中被重捕，1477尾个体（占总数19%）在放流后至少2次采样航次中被重捕。总计获取跨航次重捕记录9542条，涵盖放流及重捕时的体长与体重测量数据。仅极少数标记个体在非放流河段被重捕，此类个体已被排除于本次分析之外。本数据集包含如下制表数据：鱼类捕获记录（共158324条）、按河段与采样航次划分的体长分层种群丰度估算值，以及总丰度的上下置信区间。本研究评估了流量、水温、太阳辐射、浊度介导的反应距离（即摄食效率）、种内竞争以及猎物可获得性对虹鳟生长速率的影响。上述6个协变量的选取基于其对猎物输送速率、代谢与觅食成本、觅食效率以及猎物可获得性的影响机制相关假说。协变量数据以制表形式汇总，包含各河段与采样航次的均值及其对应的数据来源。