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

 


University increases efforts to care for campus lakes

University of Waikato increases efforts to care for campus lakes

The University of Waikato is urging people to think carefully before disposing of waste, liquids and hazardous products into drains on campus because of the negative impact on the health of the campus lakes.

Environmental and Sustainability Manager Rachael Goddard says lake conservation
efforts have been an ongoing project at the University for more than two years.

“We monitor the lakes because they are an integral part of campus and are enjoyed by staff, students and the community. We were disappointed to find ammonia levels had spiked earlier this year, which suggests someone had dumped a liquid contaminant into the lake,” says Ms Goddard.

There are 12 storm water pipes running into Oranga Lake. The campus lakes, built in the 1960s, are connected to the storm water system, which in turn discharges into the Waikato River. Ms Goddard says the University takes its responsibility in maintaining the lake’s water quality, and any run-off into the river, seriously.

A team from the University’s Department of Biological Sciences, led by Professors David Hamilton and Brendan Hicks, are currently working on improving Oranga and Knighton lakes. In addition to monitoring water quality they frequently remove pest fish, including the removal of more than 6,000 pest fish this year.

Professor Hicks says it is almost certain that pest fish are being deliberately introduced to the lake, and that people also need to be aware that getting rid of an unwanted pet goldfish into large bodies of water has damaging consequences.

“Fish may be introduced to the lake by releases of pet goldfish, but some are introduced for recreational fishing. The danger is that the fish being introduced to the lake, especially koi carp, will proliferate, further worsening the water quality in the lakes.

“A 4kg koi carp, for example, can carry as many as 400,000 eggs. Koi carp thrive in shallow lakes like those on campus and compete with native fish and eels for food.”

Professor Hicks says koi carp also worsen water quality by stirring up sediment, muddying the water and destroying native plants and fish habitats.

Most of the fish removed were tiny gambusia (mosquitofish), but more than 1,400 goldfish and 35 koi carp were also removed, including two adult koi carp weighing 4.4 and 3.5 kg each. Three more adult koi carp totalling 9.6 kg were removed in January, and population estimates suggest that at least 100 smaller koi carp remain in Oranga Lake. As these grow into adults and become more visible they can be removed before they spawn.

“Based on our studies of other shallow Waikato lakes we can estimate that, if left unchecked, the koi carp population in Oranga Lake could increase to about 500 adults weighing about 1,400 kg in total. Eight adult koi carp were captured in Knighton Lake in March 2012, suggesting that a concerted fish removal effort needs to be made in this lake too.”

Local community members can help the University care for its lakes by strictly avoiding the disposal of hazardous waste into campus drains and the lake itself, and by finding alternative homes for unwanted goldfish with friends and family, or checking with a local pet store for other options. It is forbidden by law to release live koi carp into lakes and rivers.

ENDS

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

 

PARLIAMENT TODAY:

Mt Eden Prison: Serco Inquiry Extended

A two month delay to the Government investigation into prison fight clubs shows the extent of problems within the Serco circus, says Labour’s Corrections spokesperson Kelvin Davis. More>>

ALSO:

Health And Safety: Late Addition Of National Security Provisions A Concern

The New Zealand Law Society has expressed its significant concerns at the last-minute addition to the Health and Safety Reform Bill of provisions for a closed material procedure for court proceedings where national security is involved. More>>

ALSO:

Rugby And Beer: World Cup Alcohol Bill Passes

ACT MP David Seymour’s Sale and Supply of Alcohol (Extended licensing hours during Rugby World Cup) Bill completed its third reading by 99 to 21... More>>

ALSO:

Gordon Campbell: On The Flag Campaign

So far, the public has treated the government’s flag campaign with something between disinterest and disdain. Most New Zealanders have instinctively seen through the marketing hype involved. More>>

Change For 2017: Local Govt To Decide On Easter Sunday Trading

The Government is to enable local communities, through councils, to decide whether retailers can open on Easter Sunday, Workplace Relations and Safety Minister Michael Woodhouse announced. More>>

ALSO:

(And Targets Worse Than Australia's): Foresters Abandoning Emissions Trading Scheme

The Government’s gutting of the Emissions Trading Scheme has caused foresters to leave and emissions to rise, says Labour’s Climate Change spokesperson Megan Woods. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news