Table 2. Mean values of environmental parameters for controls and exclosures in the three experiments.

Mean values (± SD) of water depth, light supply (PAR) and current velocity on accessible control tiles and fish exclosure tiles (n = 9) averaged over the experiment duration (number of measurements, n ≥ 3).

Nase density	Water depth (cm)		PAR (µmol m−2 s−1)		Current velocity (m s−1)
	Exclosure	Control	Exclosure	Control	Exclosure	Control
Low (I)	21.9 ± 10.3	20.7 ± 11.5	846.1 ± 696.2	979.1 ± 849.1	0.19 ± 0.04	0.20 ± 0.08
Intermediate (II)	29.3 ± 13.5	27.5 ± 9.8	153.6 ± 61.7	169.4 ± 78.0	0.27 ± 0.12	0.29 ± 0.08
High (III)			127.4 ± 45.3	111.8 ± 41.4	0.33 ± 0.06	0.27 ± 0.06