Extended Riverfly Autumn 2026

Already confident in the Riverfly method? Join us to learn more about freshwater invertebrate groups with Steve Brooks, Riverfly Co-chair.

This Extended Riverfly Training has been designed for existing Riverfly monitors who are already confident in the basic ARMI method – we suggest that you do the standard Riverfly Monitoring for ~1 year to gain experience before qualifying as an extended surveyor. If you are not already Riverfly trained, please book on to our standard RMI course on 17th October instead .

Extended Riverfly involves the identification of 33 groups of macroinvertebrates, instead of the standard ARMI 8 groups. It is a great way to reveal even more detail about the condition of our rivers. You may already have a site in mind that would benefit from Extended Riverfly which is great, but if not the Chilterns Chalk Streams Project also have sites – such as new restoration schemes – that we would love to have more Extended Riverfly surveys conducted on.

This training course is led by expert Extended Riverfly tutors Steve Brooks (Riverfly Partnership Co-Chair, Natural History Museum) and Simon Stebbings (CHM Riverfly Hub Co-Chair), so you will receive excellent instruction to become a certified Extended Riverfly surveyor.