| The invasive algae didymo
has been confirmed in the Rangitata Diversion Race, MAF Biosecurity
New Zealand announced today.
The algae was discovered by local Fish and Game
representatives when carrying out routine work. A sample was taken
and sent for testing, and later confirmed positive by microscopic
identification.
A recent sample taken just below Coal Creek,
which is upstream of the Rangitata Diversion Race intake, has tested
negative for didymo. Further sampling will be undertaken in the
upper
Rangitata River and nearby waterways. The diversion race provides
water power generation, for stock and irrigation, taking water from
the Rangitata River and discharging into the Ashburton,
Rakaia
and Hinds Rivers. The water race is also used for recreation.
MAF Biosecurity New Zealand didymo response
manager Chris Bicknell said “the find is disappointing, and
yet another reminder of the need to decontaminate all water equipment
when moving between waterways. The Christmas period is especially
important as there will be many people on holiday using multiple
waterways.”
The Peel Forest Enhancement Group is also disappointed
with the recent find in their area. They however remain committed
to continuing their hard work to protect the upper Rangitata, including
maintaining the vehicle washing stations already in place.
The find had increased the potential for river
users to spread didymo into other rivers in the region, again highlighting
the need for every water user to Check, Clean, Dry their gear between
every waterway.
More information on didymo and approved cleaning
methods can be found on the MAF Biosecurity website, www.biosecurity.govt.nz
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