Trout food on the River Avon

Various food types for trout are shown here in their nymph stages as found during kick sample surveys on the River Avon. The pictures have been submitted by the River managers, mainly Alan Crawford.

Caseless Caddis

A perfect example of a caseless caddis shown here in green. Yellow and brown are also found in the river especially in and among the faster moving sections, among the stones or at the tail of a riffle.

Olive – Baetidae – agile darter

Olives or agile darters as they are sometimes referred, are plentiful on the river.

Flatbodied Heptageniidae
Flatbodied Heptageniidae

Flatbodied Heptageniidae or “Mayfly” are the most common insect life form on the river and there are many varieties, each identifiable with specific markings and gill patterns, in this case a yellow May dun. They are easily found scuttling about the bottom and the surface, will also cling to stones and often referred to as flatheads. Another common variety evolves into the March Brown. This can be identified by the painted eye on the upper legs.

Yellow May dun
Yellow May Dun 24/5/2020
March Brown nymph
Brook Dun

You will also find Stonefly, olives, blue winged olive nymphs, cased caddis, freshwater shrimp, hog louse, water boatman, leaches and bloodworms in abundance. Trout and Salmon fry, minnows, sticklebacks and stone loach also turn up in our kick samples. Whilst their is plenty of bug life we tend to see less hatches in the last few years, in keeping with other fished waters.