Dataset created date 2025-05-26 DOI of dataset https://doi.org/10.5878/eyp9-2k93 Article title Contrasting responses of Arctic charr and brown trout to compensatory nutrient enrichment in an oligotrophicated reservoir Authors Göran Milbrink, Emil Rydin & Tobias Vrede* Affiliation, GM Department of Ecology and Genetics, Uppsala University, Uppsala, Sweden. Affiliation, ER Stockholm University Baltic Sea Centre, Stockholm, Sweden, ORCID https://orcid.org/0000-0002-2566-8547 Affiliation, TV Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden, ORCID https://orcid.org/0000-0001-8235-9890 *corresponding author tobias.vrede@slu.se Journal Journal of Freshwater Ecology DOI of article https://doi.org/10.1080/02705060.2025.2511868 Short description of the experiment This data set of Arctic charr and brown trout length, weight, condition and age is from a whole lake experiment with nutrient additions to Stor-Mjölkvattnet and with Burvattnet as reference system The study cover the years 2001-2009 and 2016, and nutrients were added to Stor-Mjölkvattnet during 8 consecutive years (2002-2009) For detailed method description, see the Materials and methods section in the article. Location and lake ID Lake name Outlet coordinate, °N (WGS84) Outlet coordinate, °E (WGS84) SMHI lake number Stor-Mjölkvattnet 63.8502 13.3767 708479-138058 Burvattnet 63.9558 13.3343 709664-137890 (Lill-Burvattnet) Burvattnet 709904-137912 (Stor-Burvattnet Data column Description (unit) Missing values Lake name of the lake Date YYYY-MM-DD Year year of Date Nutrient addition 0: no nutrients added. 1: year with nutrient addition Species common name of fish species Length fork length (mm) 1 missing value (length and weight not measured) Weight wet weight (g) 1 missing value (length and weight not measured) Condition condition (g/cm3x100) 1 missing value (length and weight not measured) Age the age is expressed as +years 306 missing values (age not determined) Species identities Common name Arctic charr Brown trout Latin name Salvelinus alpinus Salmo trutta Author (Linnaeus, 1758) Linnaeus, 1758 Dyntaxa ID 206231 100127