Study

Efficiency of a dual density studded fish pass designed to mitigate for impeded upstream passage of juvenile European eels (Anguilla anguilla) at a model Crump weir

  • Published source details Vowles A.S., Don A.M., Karageorgopoulos P., Worthington T.A. & Kemp P.S. (2015) Efficiency of a dual density studded fish pass designed to mitigate for impeded upstream passage of juvenile European eels (Anguilla anguilla) at a model Crump weir. Fisheries Management and Ecology, 22, 307-316.

Actions

This study is summarised as evidence for the following.

Action Category

Install climbing structures for fish

Action Link
Eel Conservation in Inland Habitats
  1. Install climbing structures for fish

    A replicated, controlled study in 2013 in an indoor channel in the UK (Vowles et al. 2015) found that installing eel tiles resulted in greater numbers of juvenile European eels Anguilla anguilla passing upstream over an experimental weir, and more eels passed over tiles with small than large studs. On average, 20 eels/trial successfully passed over the weir with eel tiles installed, whereas no eels passed over the weir without eel tiles. Similar numbers of eels attempted to pass the weir with and without tiles installed (both 30 eels/trial). More eels passed the weir over tiles with small (12 eels/trial) than large studs (8 eels/trial). In May 2013, a Crump weir (25 cm high) was installed in an indoor channel (12 m long, 0.3 m wide, 0.4 m deep). Eel tiles with small studs (1.5 cm diameter studs spaced 4.5 cm apart) were installed on half of the downstream face of the weir, while tiles with large studs (3 cm diameter studs spaced 8.5 cm apart) were installed on the other half. All studs were 5-cm high. Behaviour of 30 wild-caught eels released in the channel was recorded by an overhead video camera during each of ten 10-min trials with tiles installed on the weir and without. 

    (Summarised by: Anna Berthinussen)

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