Young-of-year Arctic grayling caught on the Kuparuk River

Arctic grayling young-of-the-year (YOY) were caught multiple times during each summer and measured and weighed. Fish were caught at designated stations from the Kuparuk River were collected during each summer from 1986 to current time. YOY growth could be calculated by using data from the first day fish were caught compared to the last day in a field season. This data can be compared to where phosphorous additions occured in the Kuparuk River. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. YOY were caught and transported to Toolik Field Station for measurements of weight and mass.