For many years now the Eden catchment has suffered from the
effects of himalayan balsam, and in some areas Japanese knot weed. These species of invasive plants cause a great
deal of damage to the riverbanks by leaving them devoid of any vegetation throughout the winter months; which
ultimately results in erosion of the banks when flooding occurs.
The initial rapid spread of these invasive plants was uncontrolled, and by the time
we realised the problems they were causing, it was too vast a job to be able to eradicate them. In reflection we
might not have been able to fully wipe out these invasive plans, but with a little effort we may well have kept
them under control.
We all hoped that no other invasive species would reach the Eden
system, however, very little was done to prevent this happening, then in 2013 the Signal crayfish, another invasive
species, was identified in one of the tributaries of the lower R.Eden. We need now to make sure that this species
does not spread into the whole system.
We are also aware of two other invasive species, the Killer
shrimp, Dikerogammarus villosus and the Daemon shrimp Dikerogammarus haemobaphes which have been identified in
certain parts of the country, in 2010 and in 2012 respectively. Dikerogammarus villosus is particularly voracious
and an aggressive predator which preys on a range of invertebrates and young fish, sometimes causing their
extinction. It tends to dominate its habitat, killing and maiming unselectively. In rivers in other parts of the
world it has been damaging to smaller species and ruined ecological chains.
Once established, invasive species are extremely difficult and
costly to eradicate. Prevention and early intervention are far more successful and cost-effective.
We therefore ask you to help ‘Stop the Spread’ of these invasive
species by cleaning and drying your fishing tackle, such as waders, wading boots and landing nets before every
outing to the Associations waters.
Alternatively, if you cannot get your gear dry for a long enough
period before your next outing, soak them in water that is around 45 degree centigrade, or just slightly above this
temperature, for several minutes. You can also check out the link below....
NNSS - Non-Native Species Secretariat
Bio - security for anglers by Stuart M Crofts