Fished Carsington Reservoir yesterday. First few casts we raised and lost a couple to the dry fly. A very promising start, so we continued with the dries but nothing. My boat partner changed to lures and caught a couple so I did the same. My first fish a superb 2 3/4lb rainbow was hooked in the tongue and bleeding so it had to be despatched. We were asking ourselves why were the fish taking dries early on and then they just stopped? When cleaning the fish the answer was there in it's stomach, which was almost exploding with Cockchafer's! There must have been a huge fall of Cockchafer's during the night and the fish had a feast. Early morning maybe saw a few fish mopping up the stragglers and then retiring for the day.
With hindsight I should have spooned that fish. What represent a Cockchafer?