Comparison of attraction, entrance and passage of downstream migrant American eels (Anguilla rostrata) through airlift and siphon deep entrance bypass systems
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Published source details
Baker N., Haro A., Watten B., Noreika J. & Bolland J.D. (2019) Comparison of attraction, entrance and passage of downstream migrant American eels (Anguilla rostrata) through airlift and siphon deep entrance bypass systems. Ecological Engineering, 126, 74-82.
Published source details Baker N., Haro A., Watten B., Noreika J. & Bolland J.D. (2019) Comparison of attraction, entrance and passage of downstream migrant American eels (Anguilla rostrata) through airlift and siphon deep entrance bypass systems. Ecological Engineering, 126, 74-82.
Actions
This study is summarised as evidence for the following.
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Install airlift fish passes Action Link |
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Install siphon fish passes Action Link |
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Install airlift fish passes
A study in 2015 in an indoor channel in the USA (Baker et al. 2019; same experimental set-up as Haro et al. 2016) found that an airlift fish pass at a simulated hydropower forebay was used by two-thirds of American silver eels Anguilla rostrata, and all eels that passed through it survived. Overall, 55 of 84 eels (66%) passed through the airlift fish pass. None of the eels that passed through died or had visible injuries. In November 2015, two screens were erected perpendicular to the water flow in a 6-m wide channel. A 'Conte airlift bypass' (constructed from steel and PVC pipe and fittings) was installed in one of the screens, with the entrance (31 cm diameter) located 11 cm above the channel floor. Air was injected into the pipe to create an upward flow (see paper for details). During each of four trials, wild-caught silver eels (53–100 cm long) were radio-tagged and released in the channel (14–42 eels/trial). Eels were tracked with four antennas and an underwater video camera for 3 h from dusk. Eels were monitored for signs of injury for 48 h after each trial.
(Summarised by: Anna Berthinussen)
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Install siphon fish passes
A study in 2015 in an indoor channel in the USA (4) found that a siphon fish pass at a simulated hydropower forebay was used by more than two-thirds of American silver eels Anguilla rostrata to move downstream, and all eels that passed through it survived. Overall, 58 of 84 eels (69%) passed through the siphon fish pass. None of the eels that passed through died or had visible injuries. In November 2015, two screens were erected perpendicular to the water flow in a 6-m wide channel. A siphon fish pass constructed from steel and PVC pipe and fittings was installed in one of the screens, with the entrance (31 cm diameter) located 11 cm above the channel floor. The siphon fish pass aimed to transport eels 22 m downstream over a bulkhead to a submerged collection cage. A vacuum pump created a gravity siphon (see paper for details). During each of four trials, wild-caught silver eels (53–100 cm long) were radio-tagged and released in the channel (14–42 eels/trial). Eels were tracked with eight antennas and an underwater video camera for 3 h from dusk. Eels were monitored for signs of injury for 48 h after each trial.
(Summarised by: Anna Berthinussen)
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