Arctic Grayling Growth in the Kuparuk River

Adult Arctic Grayling were caught and tagged in the Kuparuk River. A second fishing campaign occurred later in the summer, and any fish that was recaptured was remeasured to determine growth. 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). Arctic Grayling were caught early in the field season, tagged, and recaptured late in the field season. During each capture, the grayling were measured for length and weight. With fish that were recaptured, growth of each grayling during specific seasons was calculated.

研究人员在库帕鲁克河（Kuparuk River）捕获成年北极茴鱼（Arctic Grayling）并对其进行标记。同年夏季晚些时候开展第二次捕捞作业，对重捕的个体重新测量以评估其生长情况。自1983年起，该流域启动磷素添加实验；各监测站位的相对位置以1983年设置的初始磷素滴注装置为基准。监测站位涵盖参考河段、恢复河段与磷素施肥河段三类样点，河段的划分依据磷素添加的实施位置（详见研究方法）。北极茴鱼的捕获分别于野外调查季初期与末期进行：初期个体被标记，末期开展重捕。每次捕获过程中，均测量个体的体长与体重。针对重捕个体，可计算其在对应野外调查季节内的生长量。