Tag Archives: fishing

The amazing longfin eel

This week the Parliamentary Commissioner for the Environment released a report on the status and management of the longfin eel. It was entitled “On a pathway to extinction?” The report found that the management of longfin eels by New Zealand government agencies was inadequate and failing. It further recommended the cessation of commercial fishing of longfin eels.

The Commissioner’s report.

A longfin eel.  This female hasn't bred yet, and she will do so only once, after swimming to somewhere between New Caledonia and Fiji.  Photo (c) Alton Perrie.

A longfin eel, in a stream near Thames. This female hasn’t bred yet, and she will do so only once, after swimming to somewhere between Fiji and New Caledonia. Photo (c) Alton Perrie.

Longfin eels (Anguilla dieffenbachii; tuna is Maori for eel) are amazing animals. They breed only once and then die. The adults found in New Zealand’s waterways have yet to breed. When mature, which may take 80 years, they swim to somewhere between Fiji and New Caledonia to find a mate. The prospect of finding a mate in a far-flung ocean presumably becomes less likely as numbers decline because of human impacts. After breeding, the adults die. The young larvae then drift back to New Zealand, and make their way upriver. The amount of suitable habitat for eels in New Zealand is now much decreased.

The Commissioner highlighted this unusual lifecycle as complicating the management of eels.

The Department of Conservation rates the threat status of longfin eel as “At Risk/Declining”, while the Ministry for Primary Industries allows the annual commercial harvest of more than 100 tonnes of longfin eel. The inability to reconcile these two facts is at least partially behind the Commissioner’s call to stop the commercial fishing of longfin eels.

Earlier this year, Te Papa’s NatureSpace hosted the Travelling Tuna Tapestry project.  The aim of this project was to inspire children to be interested in the conservation of the longfin eel. The tapestry grew during its travels around New Zealand as children contributed panels; one panel came from visitors to NatureSpace.

A Department of Conservation site about the Travelling Tuna Tapestry.

Many New Zealanders will be concerned that an endemic New Zealand species is effectively being managed to extinction. According to the commissioner, “Longfin eels need urgent help from the agencies that are responsible for their management and protection.” How will those agencies respond? Will they do enough to get the longfin eel off its pathway to extinction?

Fish and birds in Tokyo

Work at the fisheries Convention on the Conservation of Southern Bluefin Tuna meeting on bycatch and ecological effects of fishing has progressed in Tokyo in March. The group met to consider ways of reducing seabird, turtle and shark bycatch in fishing for southern bluefin tuna around the southern Ocean.

Albatross and petrel bycatch remains a tricky issue for the management of tuna fisheries, with many birds annually killed in longline fisheries due to their being captured on fishing hooks. Around 3 billion tuna hooks are set annually, and albatrosses captured may number up to 100 thousand annually. Incidental mortality in tuna fisheries affects many seabird species, many of which are threatened with extinction.

See BirdLife Internationals Save-the-Albatross website for source of these statistics

Meeting of specialist on bycatch of seabirds, sharks and turtles at the CCSBT Working Group in Tokyo on 28 - 30 March 2012, at which New Zealand scientists, including Te Papa researchers were participants. Photo: Susan Waugh

Meeting of specialist on bycatch of seabirds, sharks and turtles at the CCSBT Working Group in Tokyo on 28 - 30 March 2012, at which New Zealand scientists, including Te Papa researchers were participants. Photo: Susan Waugh

A report commissioned by the Ministry of Fisheries, and prepared by Te Papa scientists and collaborators was presented. The report discussed how data on seabird distributions, fishing data, and information about bird-catch rates could be used to identify which areas and times of fishing were most problematic for tuna fishing in the Indian and Pacific Ocean areas. The study used data and methods developed over many years with collaborating parties BirdLife International and Sextant Technology, along with inputs from the Agreement on the Conservation of Albatrosses and Petrels (ACAP), the Ministry of Fisheries, NIWA, Centre Nationale de la Recherche Scientifique in France and a number of seabird researchers nationally and internationally.

A figure from seabird ecological risk assessment analyses indicating the density per square kilometre of species around the Southern Ocean. This shows a high density particularly in the New Zealand area. The study presented by Te Papa researchers and collaborators to the Convention for the Conservation of Southern Bluefin Tuna working group examined which areas and species were most at risk of adverse effects of longline fishing for tuna. Image: after Waugh et al. 2012.

A figure from seabird ecological risk assessment analyses indicating the density per square kilometre of species around the Southern Ocean. This shows a high density particularly in the New Zealand area. The study presented by Te Papa researchers and collaborators to the Convention for the Conservation of Southern Bluefin Tuna working group examined which areas and species were most at risk of adverse effects of longline fishing for tuna. Image: after Waugh et al. 2012.

The CCSBT working group agreed to continue work on this project, and will seek to refine the analyses using the most recent dataset available about bird distributions and fishing activity, including important datasets held by BirdLife International derived from satellite tracking of seabirds.

Tuna for sale in Tsukiji market in Tokyo, March 2012. Photo: Susan Waugh.

Tuna for sale in Tsukiji market in Tokyo, March 2012. Photo: Susan Waugh.

By Susan Waugh, Senior Curator Natural Environment

Matau: traditional hooks, innovative design

Bone matau. Copyright Te Papa. ME009305

An exhibition of Mäori fish-hooks (matau) made from wood, bone, stone, and shell opens at Te Papa on Saturday December 4th.

While early European explorers considered these fish-hooks to be ‘ill-made’ and ‘of doubtful efficacy’, research has shown that the design was highly effective.

Unlike modern steel hooks, the Mäori hooks were attached with fishing line tied to a groove at right angles to the direction of the point. This caused the hook to rotate, trapping the fish’s jawbone rather than piercing the fish.

Composite hook. Oldman Collection. Copyright Te Papa. OL000105

Bones from giant moa and stranded whales could be used to make large hooks, but bone alone was not strong enough to catch big fish, such as shark and groper. Hooks targeting these species incorporated additional materials for greater strength and large hooks were constructed with strong wooden kauawhi (shanks) made from dried saplings or branches, with stout bone or shell points.

Pä kahawai. Copyright Te Papa. ME013868

As well as hooks, Māori used a range of trolling lures to catch fish. All were dragged behind canoes without bait, but they differed in design and materials depending on the fish being targeted. Oceanic fish such as tuna and kingfish were caught with pā, straight lures with the line extending along the shank. Pohau mangā were long wooden lures; the line sat protected within a groove at the tip, making them ideal for fish such as barracouta whose sharp teeth could easily cut a flax line. Smaller coastal fish were caught with pā kahawai, curved lures traditionally made from a pāua shell rim and sometimes decorated with feathers.

Europeans introduced Māori to metal fishing hooks in the late eighteenth century. The new materials and tools were quickly embraced and old matau were thrown away, and the wooden and flax components soon decomposed.

Meanwhile, bone and stone matau acquired new significance as highly collectible artefacts. To meet the growing demand from collectors and tourists replica matau were made in large numbers by Māori, and also by European forgers.

Hei Matau. Copyright Te Papa. ME015518

The first Europeans observed Māori wearing fish-hooks as pendants, but for essentially practical reasons. Traditional Māori garments lacked pockets, so small tools – including matau – were often worn on a string around the neck for safe-keeping. If the tool was made from sought-after pounamu, the pendant had extra value beyond the functional. In recent years, stylised fish-hooks made of bone, ivory, or pounamu (greenstone) have become popular as pendants. Many wearers not only appreciate the beauty of these ‘hei matau’, but also value them as potent symbols of Māori cultural renaissance.

2 days left to opening…

Almost there and I was rapt to get the finalised event programme for this weekend’s opening. Our events team have done an amazing job – balancing hard science with fun, informative events for all.

Dr Steve O’Shea is back in the house talking about the importance of our specimen to the science world with TV3′s fishing guru, Graeme Sinclair

Te Papa’s own Chris Paulin will be showing how we got from an ice cube to an exhibit!

Also, squid dissections (arrow squid, mind you!), storytelling and craft activities for the young and old.

And the best thing is that all the events are FREE.

Colossal Squid versus Toothfish

John Bennetts' Captain's Blog

 

Check out John Bennet’s Captain’s Blog to see the damage that colossal squid do to toothfish! Watch out if you’re sqeamish – it’s pretty disturbing stuff!

While fishing for toothfish off Antartica, the crew often see evidence of the struggle between these two species.

Sometimes toothfish have gaping holes from being nibbled by the colossal squid’s sharp beak. Sometimes colossal squid tentacles end up in the tooth fish’s stomach!

You’ll be able to see the squid feeding on a toothfish in 3D in the Colossal Squid Exhibition at Te Papa. If you can’t make it into the building then we’ll be posting a 2D version on our Squid website (launch 13 December 2008).

Lucy H

Message from Mark in the tank

I’m the bald guy on the Squid Cam – just out of the tank for a bit!

Thanks for you comments. It’s a real balancing act when you want to protect sea life but also want to find out about it. It is sad that the squid died but it’s up to us to use the opportunity to find out more about these amazing creatures.

We’re hoping to get enough knowledge to really learn how many there are of the colossal squid. And what the real affect of more fishing in the Ross Sea will be.

Thanks for watching.

Mark Fenwick

Dolphin dangers

Marine mammals and the fishing industry don’t always mix well.

Yesterday the Department of Conservation released horrifying photos of dolphins caught by fishing trawlers in December off the west coast of the North Island.

Yes, most commercial fishing companies are following the rules and will stop fishing as soon as they see there are dolphins around but something needs to be done about those that don’t follow the rules.

More than 22 dolphins died in this one fishing trip – and that’s 22 dolphins too many.

http://tvnz.co.nz/view/page/536641/1646083

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