Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search


Scientists carry out Biosecurity NZ survey

12 October 2005

Scientists carry out Biosecurity NZ survey for clubbed tunicate

Scientists from the National Institute of Water & Atmospheric Research (NIWA) are diving in Waitemata Harbour to establish precisely how far an invasive sea squirt, known as the clubbed tunicate (or Styela clava), has spread.

The aim is to determine and map the distribution and density of it in the port and marine facilities and structures within the Viaduct Harbour and Freemans Bay. The work is being conducted for Biosecurity New Zealand so that they can assess the feasibility of various management options.

The survey team from NIWA will use a range of techniques including shore-based and snorkel and scuba searches for the sea squirt. These will allow the team to sample a variety of habitats quickly over a large area.

NIWA will also be identifying ‘vectors’ such as boats, barges, fuel and supply jetties, which have the potential to spread the sea squirt.

The work will focus first on the Viaduct Harbour, where the sea squirt was initially found, and neighbouring Freemans Bay. Further surveys will search the wider Waitemata Harbour.

About the clubbed tunicate

The clubbed tunicate is a fast-growing organism, which filters suspended plankton and organic materials from the water. It can grow up to 160 millimetres long and reach densities of up to 500–1500 individuals per square metre.

It is thought to be native to the coastal waters of Japan, Korea, Northern China, and Siberia, and is known to have spread to parts of northwestern Europe, USA, and Australia. While it mostly occurs in shallow water, the clubbed tunicate can live in water as deep as 25 metres.

It competes for space and food with native and aquaculture species. It can also be a nuisance by fouling marine farming lines, vessel hulls, and other structures.

It is also known as the Asian sea squirt, leathery sea squirt, or Pacific rough sea squirt.


© Scoop Media

Business Headlines | Sci-Tech Headlines


Onetai Station: Overseas Investment Office Puts Ceol & Muir On Notice

The Overseas Investment Office (OIO) has issued a formal warning to Ceol & Muir and its owners, Argentinian brothers Rafael and Federico Grozovsky, for failing to provide complete and accurate information when they applied to buy Onetai Station in 2013. More>>


Tomorrow, The UN: Feds President Takes Reins At World Farming Body

Federated Farmers president Dr William Rolleston has been appointed acting president of the World Farmers’ Organisation (WFO) at a meeting in Geneva overnight. More>>


I Sing The Highway Electric: Charge Net NZ To Connect New Zealand

BMW is turning Middle Earth electric after today announcing a substantial contribution to the charging network Charge Net NZ. This landmark partnership will enable Kiwis to drive their electric vehicles (EVs) right across New Zealand through the installation of a fast charging highway stretching from Kaitaia to Invercargill. More>>


Watch This Space: Mahia Rocket Lab Launch Site Officially Opened

Economic Development Minster Steven Joyce today opened New Zealand’s first orbital launch site, Rocket Lab Launch Complex 1, on the Mahia Peninsula on the North Island’s east coast. More>>


Marketing Rocks!
Ig Nobel Award Winners Assess The Personality Of Rocks

A Massey University marketing lecturer has received the 2016 Ig Nobel Prize for economics for a research project that asked university students to describe the “brand personalities” of three rocks. More>>


Nurofen Promotion: Reckitt Benckiser To Plead Guilty To Misleading Ads

Reckitt Benckiser (New Zealand) intends to plead guilty to charges of misleading consumers over the way it promoted a range of Nurofen products, the Commerce Commission says. More>>


Get More From Scoop

Search Scoop  
Powered by Vodafone
NZ independent news