Early July, under cover of darkness, fish are being counted on the Thames from Oxford to Henley. Using an electric fishing boat, affectionately known as the ‘boom boat’, Environment Agency Fisheries and Sampling teams are taking part in an annual national fish survey.
On this part of the Thames the water is deep, making the normal wading technique for sampling fish out of the question and so the ‘boom boat’ is used instead.
Anode in water - boom boat fish survey, photo courtesy of John Sutton EA