The development of length over the years for the red swamp crayfish per treatment applied. Each box represents the interquartile range, which displays the middle 50% of the data. The bottom of the box is the first quartile (Q1), and the top of the box is the third quartile (Q3). The horizontal line within the box represents the median. As no length measurements were taken in 2019, the first available length data originates from the first sampling round following draining and eel release.