May - River
On the river, the large dark olive hatches will start to tail off to be replaced by other upwing flies such as iron blue duns, mayflies & medium olives. The mayflies should start to hatch towards the end of the month. The stoneflies will also be hatching alongside alders and some sedges too. On the terrestrial front expect to see the hawthorn hatch continue as well as the arrival of black gnats on the water.
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