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

 


Rare fish and new seafloor habitats found during NIWA survey

Rare fish and new seafloor habitats found during NIWA survey

NIWA scientists surveying shallow water coastal habitats off the east coast of Northland have found a rich diversity of macroalgal meadows, shellfish beds, sponges, and rare fish species, including a frogfish and possibly a new species of seahorse.

The survey was conducted using a small beam trawl research net with GoPro cameras attached, as well as dropped stationary cameras both with and without bait to attract fish.

Its goal was to discover what types of habitats were present and where they occurred; and what juvenile and small fish were associated with them. The information gathered will ultimately help inform fishery and ecosystem management decisions.

NIWA marine ecologist Dr Meredith Lowe says the resulting information helps to fill in gaps in scientific knowledge about biogenic habitats in particular – "living" habitats created by plants and animals - and their small fish inhabitants, such as juvenile snapper. The survey results are helping to build a national fish-habitat classification and inventory of New Zealand’s coastal and shelf zone.

“Our knowledge of what lives in the coastal zone is scant. For instance, while we believe estuaries provide critical nurseries for a range of fish species, we cannot prove that until we know their relative contributions compared to possible alternative coastal nursery areas. During our survey, ‘new’ snapper nurseries and associated habitats were found in Te Rawhiti Strait, Bay of Islands, and in inner Doubtless Bay. We can now combine these data with previously collected estuary data to estimate what the relative nursery values are.

“We also know this coastal region is one of the most species diverse nationally, and this work has shown that this rich diversity also extends to seafloor habitat types, and the fish species which live in them. As an additional bonus, a number of new species of red algae were also discovered."


Frogfish

The use of GoPro cameras is a new science technology development for the team, developed from NIWA technician Crispin Middleton’s strong interests in underwater photography (having won several underwater photography competitions). Video from the cameras revealed some surprises, with a juvenile white shark bumping into the camera bait pot as it swam past, and a group of dolphins talking to each other as they checked out the sampling net down on the seafloor under tow.

The seahorse is undergoing scientific identification to assess whether it is a new species.

Dr Lowe says it will be some time before scientists can confirm its identity and how rare it is worldwide. It is about 3 cm long and predominantly brown in colour.

Meanwhile, the Ministry for Primary Industries has just released a report that reviews existing knowledge about fisheries species and their linkages to biogenic habitats.

It is hoped the review, written by NIWA [available at http://www.mpi.govt.nz/news-resources/publications], will help act as a catalyst for future management initiatives which include the role of these habitats and take into account how they are affected by human activity on land and at sea.

“Biogenic habitats are important, but have largely been ignored in the past. There are still huge knowledge gaps but this gives us the fundamental framework to go forward,” Dr Lowe says.

“As living habitats, they are vulnerable to being damaged. Anything that reduces or eliminates these habitats will produce a cascade through the system, and may ultimately negatively impact the number of fish growing to adulthood, and hence fisheries production.”

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Job Cutter Goes: Mark Weldon To Step Down As MediaWorks CEO

“When I joined MediaWorks in August 2014, I had a mandate to lead a significant change programme to bring the business back from receivership into a position where it could once again be a strong competitor in the market, with a sound and sustainable future. It was a big brief, laden with inherent challenges, but I took it in good faith and have dedicated myself fully to the goal since." More>>

ALSO:

Must Sell 20 Petrol Stations: Z Cleared To Buy Caltex Assets

Z Energy is allowed to buy the Caltex and Challenge! petrol station chains but must sell 19 of its retail sites and one truck-stop, the Commerce Commission has ruled in a split decision that acknowledges possible retail price coordination between fuel retailers occurs in some regions. More>>

ALSO:

Huntly: Genesis Extends Life Of Coal-Fuelled Power Station To 2022

Genesis Energy will keep its two coal and gas-fired units at Huntly Power Station operating until 2022, having previously said they'd be closed by 2018, after wringing a high price from other electricity generators who wanted to keep them as back-up. More>>

ALSO:

Dammed If You Do: Ruataniwha Irrigation Scheme Hits Farmer Uptake Targets

Enough Hawke's Bay farmers have signed up for water from the proposed Ruataniwha Water Storage Scheme for it to go ahead as long as a cornerstone institutional capital investor can be found to back it, its regional council promoter announced. More>>

ALSO:

Reserve Bank: OCR Stays At 2.25%

Reserve Bank governor Graeme Wheeler kept the official cash rate at 2.25 percent, in a decision traders had said could go either way, while predicting inflation will pick up as the slump in oil prices washes out of the data and capacity pressures start to build in the economy. More>>

ALSO:

Export Values Down: NZ Posts Biggest Annual Trade Deficit In 7 Years

New Zealand has recorded its biggest annual trade deficit since April 2009, reflecting weaker prices of agricultural commodities such as dairy products, beef and lamb, and increased imports of vehicles and machinery. More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news