The Yealm is a relatively short (12 miles long) river representative of
several rivers running off the southern slopes of the Dartmoor National
Park in South Devon (UK).
It carries a good head of brown trout, a run of sea trout in summer months and salmon in the autumn (November and December).
In 2011 the environmental consultancy firm APEMcarried out invertebrate surveys at seven sites using the kick sampling procedure.
Samples were collected on 25/26th May, 2011 (Spring Survey), 19 August 2011(Summer Survey), and during the week of the 19-23rd September 2011(Autumn Survey).
This page summarizes the survey results and lists the most frequently found insects. It may be of interest to fly fishers visiting the Upper Yealm Fishery and other similar rivers in South Devon.
The survey sites were very similar to these images of the Upper Yealm Fishery beat. The main flow types were run and riffle, with sand and pebbles/gravels dominating the substrate. The wide variety of river flies found in the River Yealm is typical of clean, fast flowing, stony rivers.
NOTE: The scientific names for insects are shown in italicson this page. The associated link opens a new window / tabbed page showing the results of a Google search for images of that particular insect. Anglers names for insects are shown in normal typeface and the associated link also opens a new window / tabbed page showing the results of a Google search for images of the range of fly patterns used by anglers to represent that particular insect.