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Yorkshire Esk, Ruswarp, United Kingdom

Investigating Passage: Behavioural Studies of Upstream Moving Salmonids
  
Location: Yorkshire Esk, Ruswarp, United Kingdom
Project Leads: Environment Agency (EA), University of Hull International Fisheries Institute (HiFi), North York Moors National Park

See Project Pics Download FM Slide-Chirp Pub See Project Pics - Download Pub See Project Pics Investigating Fish Passage: Acoustic Fish Tracking Project - Yorkshire Esk, Ruswarp GoPro with the Divers
See Project Pics Download FM Slide-Chirp Pub

Larinier Fish Pass entrance with hydropower active. Larinier Fish Pass entrance with hydropower active.

Objectives:

In an effort to improve understanding of how low-head hydropower may potentially impact migrating salmonids, the Environment Agency (EA) and University of Hull International Fisheries Institute (HIFI) came together with North York Moors National Park to track the behaviour of adult salmonids at Ruswarp Weir on the River Esk in North Yorkshire, England.

The overall aim of the study was to investigate the behaviour of upstream migrating salmonids at a head-of-tide hydropower scheme that included a co-located fish passage facility, to identify any impact of the hydropower scheme on fish passage and to help address one of the “evidence gaps” in knowledge about migratory behaviour around these structures. A secondary aim is to investigate fish fine-scale behaviour in relation to hydrodynamic, hydraulic and environmental cues that attract and guide fish at fish passes, in order to improve best practice guidance on fish pass design and improve fish passage rates.


Potential Results:

The fish were tracked using both a fixed 2D Acoustic Tracking System (ATS) to determine fine-scale behaviour in the vicinity of a Larinier fish pass entrance, and three mobile hydrophones situated at key locations around the weir and fish release location. Tagging and tracking a number of fish would provide the basic metrics needed (attraction efficiency and overall passage efficiency with behavioural context). Two years of post-installation monitoring have been reported presenting telemetry data for 94 acoustically tagged sea trout and salmon around Ruswarp Weir. The three mobile hydrophones were located downstream of the release point (to determine downstream migration), at the downstream end of weir (to confirm arrival at the obstacle) and above the weir (to confirm passage via routes other than the Larinier pass).

HTI is honoured to work closely with the fisheries team at the EA and HIFI in support of their efforts. To receive more information about this study, read the full publication or email HTI about the technology used at support@HTIsonar.com.

 

Larinier Fish Pass entrance with hydropower inactive.
Larinier Fish Pass entrance with hydropower inactive.
Fish pass & side-of-fish-pass ascent routes, downstream.
Fish pass & side-of-fish-pass ascent routes, downstream.
Example of a fish passage track.
Example of a fish passage track.
Example of a fish non-passage track.
Example of a fish non-passage track.
 
It's a confusing environment for migrating sea trout down there, with all kinds of competing and distracting flows! But examining the mico-scale behaviour of fish to these multiple stimuli is really helping us understand and improve fish passage at these structures.
Environment Agency - Dr. Jon Hateley
 
 
 
 

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