River Fly Monitoring

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I recently attended the Torridge and Taw River fly Celebration event at Newton St Petrock where we met up with members of the River Fly Monitoring Team. This hands on scheme has produced a wealth of valuable data that can give a valuable insight into the ecological state of our rivers. I have tried to collate some highlights from the data provided and will update when I receive news of forthcoming training events. For more information please visit;- The River Fly Partnership website :- www.riverflies.org

Email from Izzy Moser to those who attended the event.

Dear all,

Thank you for attending the Riverfly Celebration Event on Wednesday evening this week. It was really excellent to finally put some faces to names and there were a huge number of helpful discussions during the meeting, so thank you for this.

I have tried to list some of the main discussions in the notes below, but if I have missed anything, please do let me know and I will add it to the notes before circulating to the wider network.

Notes from Riverfly Taw/Torridge Event 10/01/2018:

1. There were discussions on incident reporting and what types of incidents should be reported to the Environment Agency Hotline. Volunteers were asked to report incidents with photo’s if they weren’t sure to their local Wildlife Trust or Rivers Trust. The Environment Agency Hotline Number is for incident reporting: 0800 80 70 60.
2. Volunteers requested a list of sites that would be high priority for monitoring so that new volunteers can look to take on these sites.
3. Some volunteers expressed interest in occasionally surveying an additional high priority site instead of their usual site if their usual site is consistently achieving good invertebrate numbers. Thank you for this suggestion Geoff.
4. Discussions were had on the spread of sites and whether some volunteers may want to move their site to avoid being too close to an existing site. Volunteers should discuss any concerns with their Riverfly Co-ordinator.
5. Lots of discussions were had on how to get more volunteers involved in the Riverfly programme and how training only once a year is a limiting factor of the project. Discussions were had on whether more people could get trained to run the Riverfly Training Day. Ben Fitch offered to potentially help with training small groups (5-6 volunteers) if the Teign Training Event becomes fully booked.
1. Please could everyone send any contact details of volunteers who may be interested in getting trained as a Riverfly Volunteer to Olivia for the River Taw Olivia@wrt.org or to me for the River Torridge imoser@devonwildlifetrust.org. At the moment we are only aware of a small number of people interested in the training events, so for considering the running of future events, we need to know how many people are interested.

2. If you know someone who is interested in being trained as Riverfly trainer please do let me know and perhaps we might be able to look into getting more people trained, although we can’t guarantee anything.

3. If you have any concerns about your site, or would like to register a new site, please contact your Co-ordinator I.e. Olivia for the Taw Olivia@wrt.org and me for the Torridge.

I have attached the details of the Water Framework Directive status for the River Taw and Torridge classifications. Under the column for ‘status’ it lists whether the catchment is in ‘poor’ or ‘moderate’ status. You can use the filter to also show catchments that are in ‘good’ or ‘high’ status. I have also filtered it so that it shows data from 2013-2016 in the ‘year’ column although you can look at data earlier than this if you want to by changing the filter. This should help you to pinpoint catchments that are higher risk for pollution in the ‘poor’ and ‘moderate’ category. From my knowledge of the River Torridge catchment, I am aware that the following tributaries have water quality issues: Dolton Streams, Iddesleigh Streams, River Mere upper catchment, River Mere lower catchment (already monitored), Whiteleigh Water (already monitored), Pulworthy Brook (already monitored), Dipple Water (already monitored), Bideford Yeo (already monitored) and Waldon (already monitored). Unfortunately I cannot give the same information for the Taw catchment, but hopefully the attached spreadsheet should help pinpoint some of the catchments with issues.

I am away next week so will not respond to any emails, but should be back on the 22nd and can answer any queries then.

Thanks once again for your support. It’s a real privilege to work with people who are passionate about their local rivers.

Best wishes


Izzy Moser
Freshwater Pearl Mussel Officer
Northern Devon NIA
Devon Wildlife Trust

There is a need for more volunteers on the Taw system.

Torridge and Taw Riverfly Celebration Event

January 10th 2017 at Owl Barn Studio, Little West Hole, Newton St Petrock, Holsworthy EX22 7LW, from 6:30pm

Riverfly in Devon – Set up of the Torridge and Taw, and the national picture.

Riverfly Environment Agency Update

Torridge and Taw Riverfly Results from 2014 to 2017

North Devon Projects Update including Freshwater Pearl Mussel Project

Izzy Moser,
Devon Wildlife Trust Freshwater Pearl Mussel Project

Ben Fitch,
National Riverfly Co-ordinator

Michael Thomas, Environment Agency

Matt Edworthy, Ex. North Devon Biosphere &

Olivia Cresswell, Westcountry River Trust

Izzy Moser,
Devon Wildlife Trust

(Above) Izzy Moser and Matt Edworthy

River Torridge and Taw

Izzy Moser and Matt Edworthy, December 2017

Riverfly Report


Volunteers The huge number of volunteers who put their time towards monitoring river health every year

Thanks to all past, current and in advance,

future volunteers. We can do nothing without you.

A huge thank you to Matt Edworthy who completed his role as the Taw and Torridge Riverfly Co-ordinator in August. Matt has worked since 2014 to set up Riverfly on the Torridge and unfortunately had to pass it on in 2017. In the four years since it started the project has come on leaps and bounds and there are now also active sites on the River Taw.

Riverfly Report 2017


Riverfly in the Torridge catchment was established in 2014, through a partnership with the North Devon Biosphere and Devon Wildlife Trust. It has been running now for 4 years and is one of the larger Riverfly projects in the UK, with 25 active sites in 2017 and over 40 registered sites. Since 2016, Riverfly volunteers have also been trained to monitor parts of the Taw catchment with 11 volunteers trained and 6 active sites.

The programme is almost entirely volunteer led and consists of a combination of anglers, conservationists and local river enthusiasts. It is designed to help detect pollution incidents through the identification of river invertebrates and the abundance of each group. This gives a score for each site which, if falls below the trigger level set for the site by the Environment Agency, proceeds with further action in the form of a second survey by the Catchment Coordinator or involvement of statutory bodies such as the Environment Agency. As well as detecting pollution events, the surveys can also monitor long-term changes in overall river health and act as a deterrent to polluters.

Riverfly National Review – From the Anglers’ Riverfly Monitoring

Initiative (ARMI) Project Manager

Whilst 2017 has been exceptionally busy for the Riverfly Partnership (RP), with a change of host in April and a strategic refocus of Anglers Riverfly Monitoring Initiative (ARMI) deliverables for this year, the ARMI network also has been in full flow. During the year to date, 54 ARMI training workshops have been delivered to 597 ARMI volunteers and £308,250 of in-kind ARMI coordinator and volunteer time has been committed alongside the rod licence funding which RP receives from the Environment Agency.

ARMI volunteers regularly monitor 1955 sites UK wide and continue to detect pollution incidents, reporting vital information to local statutory body contacts. Across the UK, strongly established ARMI hubs and groups are providing the spine to support Riverfly Plus, and other citizen science, initiatives, such as Extended Riverfly (siltation & low flows) and Outfall Safari (developed and first run by the Citizen Crane project in the Crane Valley catchment).

As always, my continued and sincere thanks to every single ARMI volunteer, coordinator, tutor and partner for your ongoing commitment to protecting and conserving our rivers across the United Kingdom. Special thanks to all rod licence paying anglers and the Environment Agency for providing funding support to ARMI in England, to SEPA for providing strategic support to ARMI in Scotland, to RP host the Freshwater Biological Association and to RP Chair, Steve Brooks.

Riverfly Report 2017

New Volunteers trained in 2016 and 2017 (Taw and Torridge)

In May 2016, nine new volunteers were trained at Hatherleigh Community Centre. For the first time, two volunteers who took part were the beginning of Riverfly in the Taw catchment. They purchased their own equipment and at the end of the season, one site was active (Nymet Rowland) and 3 samples were taken. During 2017, a second training event was held at the Fox and Hounds (Eggesford), with 11 volunteers trained including 9 new Taw volunteers as well as 3 new Torridge volunteers. There are now 6 active sites in the Taw catchment.

River Fly Training event Spring 2016

River Torridge

2017 update

The last Riverfly sampling for 2017 was done by the Torridge volunteers in October. Despite the difficulties accessing some stretches due to poor weather towards the end of the season, during the year, 103 samples were collected from 25 active sites. 3 new volunteers were trained up at the start of the season and 4 already registered sites were taken on by new volunteers, including Dymsdale Wood Bridge, Sutcombe Mill and Hatherleigh CC. Since Matt’s departure from the North Devon Biosphere in August, the Torridge Riverfly project has been taken on by Izzy Moser at Devon Wildlife Trust. Izzy can be contacted via email at imoser@devonwildlifetrust.org.


The data, which in some catchments has been collected for 4 years now, really shows either declining or improving river water quality across the Torridge catchment. Overall, the results show that 7 rivers have strongly improved since the start of Riverfly and 3 rivers have clearly declining water quality. Some patterns from tributaries are less clear with variable water quality throughout the survey period.

3 samples on two different tributaries; the Dipple Water and the Pulworthy Brook, failed their trigger level. The trigger level breach on the Pulworthy Brook which was reported in August was given an Environment Agency reference number. The stream has been assessed in previous years and is known to suffer from chronic low flow stress. The river was otherwise reported as healthy by the volunteer and additional surveys were not required.

The trigger level breach which occurred in the Dipple Water has also been investigated by Michael Thomas following previous trigger level breaches and is under investigation from known upstream impacts by Andrew Fuller, the local Environment Officer. Andrew carried out a site check shortly after the trigger level breach and investigations upstream are being carried out. The stream also suffers from low flow stress. For the full data, please see the separate PDF included with this document.

Riverfly Report 2017

River Torridge Results since 2014

Looking at the Riverfly programme as a whole since it began on the Torridge in 2014,

  •   547 samples have been taken
  •   50 sites have been sampled
  •   17 samples have fallen below trigger levels
  •   24 sites are inactive at the end of 2017. A few of these sites have been taken up by newvolunteers, but if anyone wishes to get involved in Riverfly and possibly take up one of these

    sites, please contact Izzy Moser at Devon Wildlife Trust via imoser@devonwildlifetrust.org.

  •   4923 volunteer hours assuming each sample requires 3 hours of time to take and enter intothe database
  •   £98,500 is the calculated financial value of the Riverfly volunteer time (using the HLF “Skilled

River Taw

2017 update

After the Riverfly training event on the 1st April, it was a little slow getting some sites registered and data collected, but by the end of the season, a total of 5 new sites were registered and 17 samples were collected. 5 sites are registered but currently inactive (table 4). Again, with the poor weather towards the end of the season, opportunities for collecting samples were limited. Since Matt’s departure from the North Devon Biosphere in August, the Taw Riverfly project has been taken on by Olivia Cresswell at Westcountry Rivers Trust. Olivia can be contacted via email at olivia@wrt.org.uk.


There are now a total of 6 sites registered in the Taw catchment. Thankfully, none of the surveys delivered in 2017 breached the trigger level set by the Environment Agency, although 4 samples were near the trigger level. Data trends for catchments with more samples collected are starting to show, although additional data is required to show any long term changes in improving or declining water quality. For the full data, please see the separate PDF included with this document.

River Taw Results since 2016

Looking at the Riverfly programme as a whole since it began on the Taw in 2016,

20 samples have been taken
6 sites have been sampled
0 samples have fallen below trigger levels
4 sites are registered but currently inactive at the end of 2017.

Riverfly Schools Update

Riverfly schools ran again in 2017, delivered by Izzy Moser at Devon Wildlife Trust. The event involved 31 children from Bradworthy Class 6 surveying to identify Riverfly invertebrates as a method of detecting river health. A thank you to Bob Shepard who volunteered to help during the day.

Since Riverfly schools started in 2015, a total of 83 children have engaged with the event which is held at Julian’s Farm near Bradworthy. Unfortunately several events had to be postponed due to poor weather conditions.


Riverfly Report 2017

Riverfly Events have also been held at Hatherleigh Primary School and at the annual Hatherleigh Fair, delivered by Elizabeth Durrant (River Lew Riverfly Volunteer).

Professor Sir John Lawton Visit

In 2016 Professor Sir John Lawton, former head of the Natural Environment Research Council and President of the Institution of Environmental Sciences, visited the River Torridge Nature Improvement Area. As part of that he travelled to a Riverfly site, closely monitored by Gordon Murray during an invertebrate survey, to discuss the importance of Riverfly monitoring in the Torridge catchment. It was Sir Lawton’s Report entitled ‘Making Space for Nature’ which led to the development of Nature Improvement Areas, of which the Torridge catchment was one of 12 in England.


Riverfly Report 2017

Freshwater Pearl Mussel Project Update 2017

This summer, the project achieved an exciting milestone. Thanks to our expert advisors from Ireland, we were able to confirm live juveniles mussels for the first time in over 50 years. The juvenile mussels which had previously encysted on brown trout dropped off at our captive rearing facility in North Devon. This enabled us to collect and return them to the River Torridge in specially selected locations. The captive breeding programme is currently in its second year, and during October 2017, the project was able to confirm a second year of successful glochidia (larvae) attachment on host fish.

This programme of work is part of the national ‘Restoring Freshwater Mussel Rivers in England’ funded by Biffa Award and co-ordinated by the Freshwater Biological Association. It is the first to trial this short- term breeding method in England.

Along with the captive breeding programme, the project delivers an array of measures to improve local water quality including tree planting, riverbank erosion management, tree coppicing, watercourse fencing, forestry track improvements, farm yard improvements, farm advice and workshops.