Riverfly monitoring

The Angler’s Riverfly Monitoring Initiative (ARMI) is a national scheme, launched by the Riverfly Partnership in 2007 to enable anglers, interested groups and individuals to monitor and help to protect their local rivers. The scheme helps ensure rivers are monitored more widely and at greater frequency than is possible by the Environment Agency alone.

Pollution incidents can occur in rivers from many different sources, which can have disastrous effects on the river environment and wildlife which depends on it. Certain invertebrates are very sensitive to pollution and can be used as effective early indicators of pollution events. By monitoring certain invertebrate species, monitors can identify a pollution event and enable a rapid response before the problem becomes irreversible or wipes out entire watercourses.

The survey

Volunteers visit their allocated site on a monthly basis and carry out a 3 minute kick sample and a 1 minute hand search. They then record the abundance of 7 key pollution sensitive groups of invertebrates, focusing on the riverflies.

Volunteers must attend a training course before taking on a riverfly site.

Key taxa:

  • Caddisflies
  • Mayflies
  • Stoneflies
  • Freshwater Shrimp

Sign up for a site

If you have attended a riverfly training course and would like to take part in the survey please view our monitoring network to find a site near you.

Riverfly training course

Attend on of our training courses to learn everything you need to know about how to survey and identify riverflies for the ARMI survey.

Upcoming FREE training sessions:

Survey Results – Update reports

This work is possible thanks to the support of Thames Water.