Data and code from: River barriers as a driver of elevated mortality rates in an iteroparous anadromous fish

This dataset contains acoustic telemetry–derived survival and spatial
mortality data for twaite shad (Alosa fallax) tracked over seven spawning
migrations in the River Severn basin, UK. The data constitute the base for
analyses described in "River barriers as a driver of elevated
mortality rates in an iteroparous anadromous fish". The repository
includes .csv data files and annotated R scripts required to reproduce all
analyses. Files are organized into three analysis folders
(“Survival_Analysis”, “Weir_Effects”, and “Other_Tests”), plus a receiver
metadata file. The data include individual-level survival records
(start/end times, censoring, and mortality events), biological variables
(fork length, sex, spawning history, tagging status, return year), and
spatial summaries of observed mortalities and time spent at acoustic
receiver stations. Receiver stations are classified by position relative
to weirs (downstream, upstream, unimpeded), and detection efficiencies
(2018–2024) are provided. The dataset can be reused for survival analyses,
spatial mortality assessments, and studies of migratory fish in fragmented
river systems. The data contain no personal information and raise no
privacy concerns.