Salmon fishery boards have joined forces with the country's canoeists to try to prevent a deadly parasite entering Scottish waters.

It is feared the gyrodactylus salaris (Gs) parasite could devastate salmon stocks and have a major impact on the economy with angling and canoeing suffering along with the whisky, paper and bottled water industries, which rely on fresh water.

The Association of Salmon Fishery Boards (ASFB) and Scottish Canoe Association (SCA) want a high-profile campaign at ports and airports to raise awareness of the threat from the Gs parasite, which has already devastated stocks of Atlantic salmon in Norwegian rivers.

The two organisations say although the Scottish Executive Environment and Rural Affairs Department is taking the issue seriously and their own organisations give advice for anglers and canoeists on how to avoid accidentally importing Gs into this country, more effort should be made, especially by English agencies, to tighten defences.

The ASFB and SCA would like to see: clear information about Gs at ferry ports and airports; leaflets and posters on ferries linking the UK to Scandinavia; and greater effort being made at Westminster to encourage agencies to spread the message across the rest of the British Isles.

Mike Dales, SCA access and environment officer, said: "We are doing all we can to raise awareness of the issue among canoeists and to recommend ways of disinfecting.

"It concerns us that anyone travelling overseas, especially to Norway where many paddlers go each summer, will not pick up this message at the ferry terminal or on the ferry if they hadn't learned about it before they left home. We are concerned that the authorities are not responding with sufficient urgency.

Andrew Wallace, ASFB director, added: "Gs is the single greatest threat salmon stocks in Scotland have ever faced. It is vital that every conceivable effort is made to prevent its introduction.

"It concerns us greatly that the ferry, port and airport interests do not appear to be taking sufficient precautions."