Carlisle Angling Association

Carlisle AA Biosecurity

It is very important that anglers fishing Carlisle AA waters take appropriate steps to ‘Stop the Spread’ of invasive species. Therefore the committee are asking members and visitors to check the links below to see what they are advised to do regarding the cleaning and drying of their fishing tackle, such as waders, wading boots and landing nets.

Our rivers are under constant threat from invasive species. For many years now, we've had to live with our riverbanks covered in 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.

In 2013 the signal crayfish, another invasive species, was identified in one of the tributaries of the lower Eden. Work is currently being undertaken to try to prevent this species spreading throughout the Eden system.

We are also aware of two other invasive species, the killer shrimp, dikerogammarus villosus and the demon shrimp dikerogammarus haemobaphes which have been identified in certain parts of the country, in 2010 and in 2012 respectively. The killer shrimp (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. This has had a devastating effect on some river systems in other parts of the world.

signal crayfish

killer shrimp

We currently have a problem with Hog Weed and we ask that members report sightings of it to the secretary.

hog weedp

check clean dry

demon shrimp

demon shrimp

Demon Shrimp photos licensed by Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)

Images and Information on demon shrimps are available at Bold Systems