Evaluation of a fine-spaced angled rack with surface bypass in providing safe and timely downstream passage for salmon smolts and silver eels | Knowledge and Management of Aquatic Ecosystems

Anthropogenic impact on freshwater habitats, communities and ecosystem functioning

Open Access

Table 3

Number of silver eels according to passage route. Proportions in brackets refer to intake approaches. P_FDPS and P_ip (FDPS specific and impediment passage efficiency) are shown.

Campaign	Impediment approach	Dam passage	Intake approach	Turbine passage	Bypass passage	Bear trap gate	P_FDPS	P_ip
2017/2018	35	4	31	2 (6.4%)	15 (48.4%)	14 (45.2%)	93.5%	94.3%
2018/2019	30	16 + 1*	14	0 (0%)	13 (92.9%)	0 (0%)	92.9%	100%
*TOTAL*	65	20 + 1	45	2 (4.4%)	28 (62.2%)	14 (31.1%)	93.3%	96.9%

One individual approached the intake but finally passed through the dam.

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