<b>Data for Interactive influences of flow variation and non-native trout on vulnerable galaxiids</b>

Understanding the interactive effects of non-native species and alterations to flow regimes is important to combat threats to freshwater communities. We evaluated how stream drying affected interactions between vulnerable native stream-resident galaxiids and non-native trout in Aotearoa | New Zealand. We electrofished (December 2020 – March 2021) paired perennial and drying reaches in the Canterbury high country containing galaxiids (Galaxias vulgaris and G. paucispondylus) to compare abundance in streams with high abundance (n=2), low abundance (n=2) or no brown trout (n=3; Salmo trutta). These data give the abundance in various metrics for these reaches sampled from electrofishing in the austral summer of 2020-2021. The results of this study are reported in Olivia R. Hore, Jonathan D. Tonkin, Nixie C. Boddy, and Angus R. McIntosh (2025) Flow matters: Unravelling the interactive influences of flow variation and non-native trout on vulnerable galaxiids. River Research and Applications.