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


A celebration of fish migration

A celebration of fish migration

Saturday 24 May is World Fish Migration Day, a subject close to the hearts of Horizons Regional Council’s freshwater management team.

The Horizons Region is home to 17 species of native freshwater fish and over the past few years Council staff have been working in partnership with landowners, engineers, Horowhenua District Council, NZTA and the Ministry for the Environment to help these fish move freely through waterways.

Freshwater management officer Anna Deverall is new to her role but has already been part of work to install 8 fish passes and 3 fish-friendly floodgates within tributaries of the Manawatū River.

“Many people don’t realise the diversity of fish life that inhabits our rivers and streams, but once you get talking to people they’re often keen to find out more.

“Some of our native fish are really good climbers, others aren’t as good. We’ve been working with our engineering team to determine the best solutions for the rivers and streams where fish passage is compromised by culverts or flood protection works,” she says.

The Horizons team have walked a lot of rivers from the mainstem back up to their source to try and locate any barriers and prioritise them for fixing.

“Basically there’s no point in fixing a downstream barrier if there’s another one upstream,” Ms Deverall says.

“Further down the track we’ll measure the effectiveness of fixes to the barriers to check whether they’re working and continue our learning around what works for different species.”

Five different native fish species make up the whitebait catch and over 90 percent of those caught are inanga. The remaining species are koaro, giant kokopu, banded kokopu and short jaw kokopu.

Ms Deverall describes inanga as diadromous, meaning they spend half their lifecycle at sea with the other half spent in freshwater.

“Adult inanga lay their eggs in the dense long grass along stream banks during high tides in February and March. These eggs hatch during the next high tides and larvae are carried out to sea.

“In the springtime, juvenile inanga make their way back upstream where those lucky enough to escape the whitebaiters’ nets grow to become adults and repeat the cycle.

“If you find whitebait crawling up the side of the bucket holding your whitebait catch, please consider releasing these as they are koaro; the rarest of our whitebait species,” she says.

Other native fish species found in the Horizons Region include: dwarf galaxids, brown mudfish, redfin bully, bluegill bully, lamprey, common bully, giant bully, torrentfish, smelt, longfin eel and shortfin eel. Many of these species can be viewed at Te Manawa as part of its Te Awa exhibition.

Measures put in place to help these fish swim freely in rivers and streams range from baffles created using rocks and mussel rope for fish to climb up, to weighted flood gates installed in areas where traditional flood gates are restricting fish movement. Ms Deverall says the chosen solution is largely dependent on fish species, in-stream environment and the type of obstruction.

Horizons’ State of Environment report released in 2013 shows maps of sites where native fish have been found. It states that while additional populations of rare and threatened species were discovered during a survey in 2011, predictive modelling suggests there should be significantly more native fish in significantly more sites.

Ms Deverall hopes that increased awareness around native fish species and their migratory patterns in conjunction with work currently underway will see populations increase over time. The Council is running a colouring competition around World Fish Migration Day to aid this awareness.

Copies of the colouring competition are available from the Horizons website or by contacting Horizons’ environmental educator or freshwater team on toll free 0508 800 800. There are three age categories for entries: under 6, 6-9 and 9-12. Winners will receive native plants for their homes or schools.

Horizons will also feature a different fish on its Facebook page over the next couple of weeks, providing an opportunity for people to find out more about each species.

“Our native fish are pretty special but once they’re gone they’re gone forever. World Fish Migratory Day is a good opportunity to raise awareness and get people thinking about the significance of our Region’s rivers and streams as native habitats,” Ms Deverall says.


© Scoop Media

Parliament Headlines | Politics Headlines | Regional Headlines



Werewolf 58: No Climate For Change

The last time the global community tried to take collective action on climate change the world’s leaders finally came to agree that every not-too-onerous effort should be made to hold global warming to 2°C above the pre-industrial average. At Paris, all 150 participant countries nations will have put forward their pledges... On the information available, New Zealand's is the second weakest contribution of any nation in the developed world. More>>


What Was The Package? Police Not Explaining Lambton Quay Emergency

Police cordoned off part of Lambton Quay Wednesday afternoon, saying that a suspicious package had been found. Buildings were evacuated and buses were detoured. The army’s explosive ordnance disposal unit was brought to the Quay. More>>

Public Sector Still Shrinking: Record Low Number Of 'Backroom Bureaucrats'

Ongoing restraint in the public sector and a focus on better frontline services has seen a further reduction in the number of core Government employees, State Services Minister Paula Bennett says. More>>


Disobeying The Law: Police Censorship Of Crime Research “An Outrage”

The Green Party is calling on Police Minister Michael Woodhouse to ensure Police scrap controversial contracts that place onerous restrictions on academic researchers’ access to Police data, the Green Party says. More>>


Q+A Transcript: Groser ‘Not Expecting’ Failure At UN Climate Talks

‘I will be very surprised if we don’t get an agreement. I think it’s a completely different situation to Copenhagen for a number of reasons. We’ve got a much more realistic negotiating proposal on the table. Secondly, I think the science has strengthened...’ More>>


Greenpeace Protest:

Climate Talks, Immigration And Housing: PM's Post Cabinet Press Conference

Prime Minister John Key began by talking about his recent attendance at the APEC and ASEAN summits. He segued neatly from the opportunities available in Vietnam to outlining his upcoming itinerary which includes Malta, Paris and Berlin. More>>


After Urgent Law Change: Beneficiaries Urged To Act Immediately

I am hoping that thousands more people will be enabled to lodge their review... people without internet, who don't even realise that this has been happening. If just a fraction of the people on facebook can help others to put in reviews tomorrow it could improve so many more peoples Christmas. More>>


Get More From Scoop



Search Scoop  
Powered by Vodafone
NZ independent news