Stopping the spread of didymo by walking through a bath of desinfectant upon leaving the boat to start the Milford Track

            Didymosphenia geminata (didymo), also known as "rock snot" is a freshwater diatom (a type of alga) and was first reported in New Zealand in the Lower Waiau River in 2004. Didymo is currently found in over 150 South Island Rivers, but is not in the North Island. Under the Biosecurity Act 1993, the entire South Island is a Controlled Area. This means people are legally obliged to prevent the spreading of didymo.
Didymo is a microscopic pest that can be spread by a single drop of water. Even if you can't see it you could be spreading it. Therefore to prevent the spread of didymo you must Check Clean, Dry your gear when moving between waterways, and treat every waterway like it is infected with didymo.
Didymo can attach itself to stream, river and lake beds by stalks, and can form a thick brown layer that smothers rocks, submerged plants and other materials. It forms flowing 'rats tails' that can turn white at their ends and look similar to tissue paper. As the 'tails' of the alga get longer they become white in colour.
   

Taken in: New Zealand / Southland (show map)

Taken on: February 16, 2012

Tags:

New Zealand

South Island

Hiking

Milford Track « less

Sets appears in: • 2012-2 NZ Milford Track

Camera: Panasonic DMC-ZS3, f/3.5, 1/125 sec, 4.1mm, ISO 80 (more info) (hide info)

Camera:	Panasonic DMC-ZS3
Aperture:	f/3.5
Exposure Time:	0.008 sec (1/125)
Focal Length:	4.1mm
ISO:	80
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Program AE
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	sRGB
Software:	QuickTime 7.6.6
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