Grand Passage for Elvers
Posted: 25 Feb 2013 01:54 PM PST
Aquatic Control Engineering has been working with
The Canal & River Trust, Thames River Trust and The
Environment Agency to secure the future of the European
Eel by installing elver passes along the Grand Union Canal.
European eels have a fascinating life cycle, spawned as
larvae in the Sargasso Sea near Bermuda before travelling
with the Gulf Stream to Europe, developing into glass eels.
Upon reaching coastal areas they migrate up rivers and streams,
such as the River Brent, which forms a large section of the
Grand Union Canal, turning into elver (baby eels) as they hit
freshwater.
However, their migration into the upstream waters and ponds
where they mature has many obstacles. Weirs, which help to
prevent flooding, make it difficult for the elvers to complete
their journey.
The first of four elver passes is at Boston Manor on the Grand
Union Canal.
This sandwich pass has long bristles and a very gentle water flow,
which allows the elver to crawl along the walls of the weir and into
the next stretch of river.
The elvers mimic wet grass being pressed against the wall,
stopping hungry herons snatching them from the water.
Monitoring of the success of these passes will allow Aquatic
Control Engineering to update the design of future elver passes.
Leela O’Dea, environment manager at the Canal & River Trust says:
"I am really excited to be involved in the design and installation of
elver passes, these are amazing animals with an unequalled journey,
it is a testament to the natural environment and those working in it
that such strong partnerships can be developed to bring about
important changes within the river systems."
The National Anguilla Club (NAC) - The Eel Specialist - Eel Fishing