Fig. 3

Comparison of post-tagging egress times from the Fox River (a) and survival estimates (b) for two immobilization treatments (TENS = transcutaneous electrical nerve stimulation; Eugenol = Aqui-S 20E (10% eugenol) at a concentration of 40 mg/L) tested on lake whitefish (Coregonus clupeaformis) for acoustic tagging in the Fox River, Wisconsin, in November 2021. Boxplot in panel a includes a horizontal black line representing the median, a black diamond representing the mean, boxes showing the interquartile range, and whiskers showing the extremes (1.5 × the interquartile range). The y-axis represents the number of days from tagging until fish were detected on any acoustic receiver in Green Bay (see Fig. 1 for details of acoustic receiver array). Plot in panel b shows monthly survival (φ) estimated using the Cormack–Jolly–Seber model (see Tables 2, 3) that included the effect of immobilization method on survival, with error bars representing 95% confidence intervals. No differences were detected between the two immobilization treatments based on these metrics