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

 


Fishing threatens rare dolphins in tourist hotspot

Fishing threatens rare dolphins in tourist hotspot: Otago study
Friday 5 July 2013

New research by University of Otago scientists has shown that the Hector’s dolphin, an endangered species found only in New Zealand, is more at risk from amateur fishing in Akaroa Harbour than had been thought.

Akaroa harbour is the largest harbour on Banks Peninsula, near Christchurch. It is home to a valuable dolphin-watching industry, which takes visitors to see and swim with Hector’s dolphins.

The team, comprising dolphin experts Professor Steve Dawson, Associate Professor Liz Slooten, and statistician Associate Professor David Fletcher, moored three “T-POD” acoustic devices in the inner, middle and outer parts of Akaroa Harbour. The devices logged the high-frequency echo-location signals of Hector’s dolphins over an entire year.

“Because Hector’s dolphin echo-location clicks are very different from those of other dolphins in New Zealand, we can tune the T-PODs to detect them specifically,” Prof Dawson said.

He says previously it was thought that Hector’s dolphins were present in the inner harbour only in summer.

“Because of this, amateur fishers were given a concession allowing them to set unattended set nets in this area for seven months of the year (1 April - 30 September). The nets, made of nylon mesh, can entangle dolphins and prevent them from surfacing for air,” he says.
The devices have a small detection radius, of about 200 metres. Despite this representing less than 1% of the inner harbour area, Hector’s dolphins were detected on 41% of the days during the recreational fishing concession period when set nets could be used.

“This shows that dolphins use this area much more regularly that previously thought, and that the concession offered to amateur gillnetters is not safe for the dolphins,”  he says.

“A crucial problem for Hector’s dolphins is that in several key areas the protection does not match the dolphins’ distribution. The new research shows this is true in Akaroa Harbour, but it is also true offshore around Banks Peninsula, where aerial surveys have shown that the dolphins range much further offshore than the protection extends. A large part of that population is essentially unprotected.”

The research also revealed how the dolphins use the harbour varies with location, season, time of day and tide. The research was published yesterday in the scientific journal Endangered Species Research.
http://www.int-res.com/abstracts/esr/v21/n1/

ENDS

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Taxing Multinationals: EU Ruling Sours Apple

Shares of Apple slid, down 0.9 percent as of 3.08pm in New York, after the European Commission ruled that Ireland granted the company undue tax benefits of up to 13 billion euros (US$14.5 billion)—"illegal aid” under EU rules that the commission says Ireland now must recover from Apple. More>>

ALSO:

NZX Review: Best Practice Code Recommends Code Of Ethics

NZX, the sharemarket operator, is seeking feedback on proposed changes to its corporate governance best practice code including a published code of ethics, rules about share trading and continuous disclosure, and more transparency over board appointments and chief executive pay. More>>

ALSO:

Auditors:

Signs Of Life? SETI On Russian Space(?) Signal

A star system 94 light-years away is in the spotlight as a possible candidate for intelligent inhabitants, thanks to the discovery of a radio signal by a group of Russian astronomers... Could it be a transmission from a technically proficient society? At this point, we can only consider what is known so far. More>>

Post-Post: Brian Roche To Step Down As NZ Post CEO

Brian Roche will step down as chief executive of New Zealand Post in April 2017, having led the state-owned postal service's drive to adjust to shrinking mail volumes with a combination of cost cuts, asset sales, modernisation and expansion of new businesses. More>>

ALSO:

Company Results: Air NZ Rides The Tourism Boom With Record Full-Year Earnings

Air New Zealand has ridden the tourism boom and staved off increased competition to deliver the best full-year earnings in its 76-year history. More>>

ALSO:

New PGP: Sheep Milk Industry Gets $12.6M Crown Funding

The Sheep - Horizon Three programme aims to develop "a market driven, end-to-end value chain generating annual revenues of between $200 million and $700 million by 2030," according to a joint statement. More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news