contact us

22 Victoria Road
Derry~Londonderry
Northern Ireland
BT47 2AB

Tel: +44 (0) 28 7134 2100
Email: general@loughs-agency.org

Dundalk Street,
Carlingford,
Co Louth,
Rep. of Ireland

Tel: +353 (0) 42 938 3888
Email: carlingford@loughs-agency.org

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Fish Counters

Latest Net Up Counts

Counter Net Up Count Date Counted
Strule Counter Site 990 31/12/18
Clanrye Counter Site 2291 31/12/18
Corrick Counter Site 1667 31/12/17
Faughan Counter Site 880 31/12/18
Finn Counter Site 3955 31/12/18
Roe Counter Site 4305 31/12/18
Sion Mills Counter Site 1214 31/12/18

Loughs Agency has been collecting data using the logie 2100c fish counter that was first introduced as a management tool during 1996 on the River Faughan and Mourne. The data is used to make decisions on managing the fishery and as a result of the accuracy of the Logie the Agency has introduced them onto six other locations within the catchment areas.

The Loughs Agency currently operates eight fish counters. Each counter site is of considerable size and each one an engineering feat in itself.

The counters are located on eight different rivers and provide vital data to the Agency about the movement of both adult salmonids and smolt salmonids on these rivers. Each counter records the number of fish travelling up stream and down stream. It is even possible to tell the size of the fish by examining the signal it creates as it travels over the counter boards.

Counter History

The Loughs Agency uses Logie resistivity fish counters which were developed by Aquantic Ltd in Scotland over 35 yrs ago. It is widely recognised as one of the most reliable systems for counting fish and is proven technology that is utilised by other agencies worldwide. The resistivity method for counting fish movement within inland waterways is well established having a development history dating back to 1949.

How it Works

The Logie resistivity fish counter is used in conjunction with an electrode set or array to detect the upstream and downstream movement of fish. The electrode set is made up of 3 metal conductors placed in a parallel alignment to form an open array configuration for weir use or a closed tube configuration for tunnel use.

The electrodes are submersed in a body of water to form a resistive transducer, a fish swimming through a body of water above the array displaces its own volume of water, its body mass being considerably less resistive than the volume of water which it displaced, so the fish passing causes a reduction in the resistance detected between electrodes.

The Logie Counter continuously monitors the subtle changing in resistance and generates a signal, if a fish passes the electrodes upstream then first the centre-lower followed by centre-upper electrodes detect a drop in resistance as the fish displaces its own volume of water. A fish swimming through the array/electrodes allows the counter to record the resistance and in turn generate a signal giving swimming direction and approximate size.

For a more detailed view of the Loughs Agency counter program and how we handle all data then please read/download the PDF’s titled “A Basic overview of the Counter Program” and “Counter Program – Web Ver 1.1

The figures above are the net upstream movement of fish from January 2017.

The Loughs Agency advise that all electronic fish counter figures reported on this website are provisional and may be subject to change.

The fish counter on the River Strule was purchased by the Loughs Agency in 2005 with funding secured from the European Regional Development Fund through the INTERREG IIIA Programme.