Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 

Lake algae found in Waikato and Manawatū-Whanganui regions

Lake algae found in Waikato and Manawatū-Whanganui regions for first time

Lindavia intermedia, a microscopic freshwater algae species, has been found in the Waikato and Manawatū-Whanganui regions for the first time. Its discovery prompts a reminder to all water users to ‘check, clean, and dry’ when moving between waterways.

Lindavia intermedia is an extremely small freshwater algae species that floats in the water column of lakes and has the potential to create lake snow. It poses no risk to food sourced from lakes or to human and animal health. Currently there is no known impact on the health of lakes, however further research is needed.

Lindavia intermedia was discovered in the North Island in Lake Waikaremoana in 2008. Early this year, researchers from NIWA were trying to figure out when lake snow first arrived in the country and tested historic water samples. They confirmed with Horizons Regional Council late last month that Lindavia intermedia was present in samples taken from the Moawhango River.While the positive samples were taken 5kms and 40kms downstream of Lake Moawhango, it is most likely to be present in the lake.
Following conversations with Waikato Regional Council, iwi, and other stakeholders, further investigation has indicated it is also present in Lake Rotoaira and Lake Taupō. Meanwhile, testing is underway on water samples collected from lakes downstream from Lake Taupō.

Horizons Regional Council’s samples from Lake Otamangakau have come back clear, however the council will undertake additional testing at popular fishing and recreational waterways such as Lakes Wiritoa, Dudding and Namunamu.

Horizons freshwater scientist Michael Patterson says that where Lindavia intermedia has been found it’s likely this algae species has been in these lakes for more than a decade. This is because the historic samples recently retested are from as far back as 2005.

“Over that time, the Lindavia intermedia has not produced lake snow effects as far as we are aware and we have no evidence of it causing issues to lake users,” says Mr Patterson.

“There is currently no known way of removing Lindavia intermedia once it is present in a lake or waterway. The conditions necessary to produce the lake snow effect are not clear, more research is needed.”

“As lake snow produces mucus-like strands of slime which hang and drift under the water, sticking to fishing gear, boat hulls, swimmers, and can clog boat, industrial and domestic water supply filters, we’re keen to prevent it,” says Waikato Regional Council biosecurity officer Paul Quinn.

“Water users play a critical part in protecting their favourite waterways,” says Mr Quinn.

“The key is to always check, clean, then dry any equipment that comes into contact with the water, between every waterway, every time.”

While other waterways may also have Lindavia intermedia, rivers and streams with fast moving flows are believed to be less than ideal environments for the algae to thrive.

Both regional councils are looking at options for adding Lindavia intermedia testing to their regular monitoring programmes and are working with stakeholders and researchers to find out more about what conditions influence the growth of the algae.

“In particular, we are keen to understand what causes it to produce lake snow like it has in some South Island lakes,” said Mr Quinn.

NIWA research for lake snow presence in the South Island identified that the Check, Clean and Dry methods used for didymo are also appropriate for use with Lindavia intermedia and lake snow.

Cleaning options are:
Dishwashing detergent or nappy cleaner – 5% solution (500mls diluted to 10 litres in water). Soak or spray all surfaces for at least 1 minute, or
Bleach – 2% solution (200mls diluted to 10 litres in water). Soak or spray all surfaces for at least 1 minute, or
Freezing until solid.

Drying can be used as stand-alone treatment for non-absorbent items if you take great care to:
make sure gear is completely dry to touch, inside and out
leave dry for at least another 48 hours (after drying), before entering a different waterway.

To find out more on how to protect our waterways, visit www.mpi.govt.nz/check-clean-dry.

© Scoop Media

 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

KiwiBailed: KiwiBuild Head Officially Resigns

The head of Kiwibuild, Stephen Barclay has officially resigned from the role. In a statement issued on his behalf, it was announced that he would step down from today [Friday].

Housing Minister Phil Twyford's office said he would not be commenting on Mr Barclay's resignation as it was an employment matter. Last month, Mr Twyford confirmed that Mr Barclay had not been at work for a number of weeks. More>>

 

Welfare Stats: Rise In Hardship Numbers Shows Income Inadequacy

The latest Ministry of Social Development quarterly report show that a record number of people have received hardship assistance from work and income, with an additional 40,000 hardship payments made between September and December 2018, compared to the previous quarter of the same year... More>>

ALSO:

DHBs "Prepared": Junior Doctors Strike Again

The needs of acute patients will be met during tomorrow's junior doctor strike, a DHB spokesperson says... Almost 3000 junior doctors are expected to walk off the job, which will affect all DHBs apart from West Coast District Health Board. More>>

ALSO:

Gordon Campbell: On MBIE’s Social Media Scam

Given the ambit of MBIE’s work, almost any form of social activity could qualify as being part of MBIE’s brief, so the privacy threats posed by this training programme are extensive. The current oversight safeguards seem threadbare to non-existent. More>>

ALSO:

JusTrade: New Campaign For A 21th Century Trade Agenda

‘Critique is no longer enough. If anything is to really change, we need to step away from the existing framework and take a first-principles approach to rethinking what will work for the 21st century.’ More>>

Earlier:

Gordon Campbell: Thompson + Clark Are The Tip Of The Iceberg

How can we tell where and how any lines are being drawn? Oversight is not exactly robust. If it were, Thompson + Clark would have been out of contention for state security work ten years ago. More>>

Trainers: Taratahi Institute of Agriculture In Interim Liquidation

Taratahi employ 250 staff and this year has provided education to over 2500 students. Taratahi owns and manages 8 farms throughout the country. More>>

ALSO:

IPCA Report: Complaints About Deputy Commissioner Wallace Haumaha

The Authority has found that DC Haumaha acted improperly by approaching staff and others to provide information to support him to refute the allegations about his 2016 conduct, or solicited other staff to do so on his behalf... More>>

ALSO:

 
 
 
 
 

LATEST HEADLINES

  • PARLIAMENT
  • POLITICS
  • REGIONAL
 
 

InfoPages News Channels