Mayflies on the River Thames By Garden Posts On 16 May 2014 · Add Comment Mayflies along the River Thames On a stroll along the River Thames between Shiplake and Wargrave today, the mayflies were out in force. Doing thier thing of hovering up, dropping back down and repeating non stop, no doubt in search of a mate to complete their short life cycle. Tagged with → mayfly • river thames