Pontardawe and Swansea Angling Society

© 2009-18

Alerts - Invasive Species

There’s a real threat to Welsh fisheries from invasive non-native species. Before using club waters, members should ensure that tackle and clothing (particularly waders and nets) used elsewhere are thoroughly cleaned and disinfected. More details are given in the notes on each threat.

11 Feb 2011

Gyrodactylus Salaris

Also known as “Salmon Fluke”, this is a parasite which infects the skin, gills and fins of salmon, trout and some other types of fish in fresh water. It is less than half a millimetre in size, so small that it is barely visible to the naked eye. Despite this, it can cause serious damage in some strains of Atlantic salmon.

The effects of the disease are so serious that salmon stocks have now been lost completely from more than 20 Norwegian rivers.

Download a leaflet from the Welsh Assembly Government website here... (PDF 1,777KB)

Dikerogammarus Villosus

Also known as “Killer Shrimp”, because of its appetite for native species like shrimp, young fish and insect larvae, it can alter the ecology of the habitats it invades. It's now been confirmed at Cardiff Bay and Eglwys Nunydd Reservoir in Port Talbot.

Further information, including a video clip, here, here and here...

Biosecurity for anglers... and for boaters...

Other Alerts

Ticks and Lyme Disease. Ticks can be picked up by anyone using the countryside. They can carry a variety of infectious diseases, the most common being Lyme disease. A leaflet providing information on avoiding / dealing with tick bites can be found here (PDF 300KB) and more details can be found on the BADA UK website at www.bada-uk.org.

Leptospirosis (Weil's Disease). Leptospira bacteria are often carried by rats and excreted in their urine thus contaminating water and muddy soil. The bacteria can enter the human body through cuts, grazes, mouth or mucous membranes such as those which line the nose and ears. Symptoms are similar to those of influenza - temperature, muscle aches and nausea. Most people with leptospirosis (fewer than 50 cases each year) don't go on to develop the more serious Weil's Disease. However, the earlier leptospirosis is treated the better, so consult your doctor if you feel ill after coming into contact with water anywhere near or in the river.

Health and Hygiene Guidelines. Do not swallow river water. Cover any cuts or sores with gloves or waterproof plasters. Wash your hands before eating.