Silver eels move downstream and into the sea in pulses, responding
to heavy rainfall or flood events. Often there are large batches of eels
leaving at one time and so Somerset may see a large scale exodus if there has
been persistent rain across the county affecting all the river systems. The
rivers Tone and Yeo flow into the River Parrett and this is a major artery for
eels to travel down. The King Sedgemoor Drain, the Brue, the Axe and the
Congresbury Yeo all are capable of discharging silver eels out into the Bristol
Channel – the first part of the marine leg of their 3500 mile journey towards
Bermuda and the Sargasso Sea.