Fig. 2

Overview of the set-up and data from turbine F05. a Overview of the complete APT set-up. In the data analysis, each receiver was excluded once from the triangulation analysis. b Derived fish positions (based on all receivers included): colour indicates HPE associated with the position: the lower the HPE, the higher the expected position accuracy. Positions of receivers and reef balls are indicated with black dots and buried electrical cables are represented by grey lines. c and d Effect of the exclusion of single receivers from the position triangulation analysis on the spread of c the daily set-up efficiency (% of positions calculated) and d the daily position accuracy (difference in HPE between the same fish positions). Violin plots illustrate the probability density and the red points with lines are the mean values with standard errors