Category Archives: Fish

Arrival of Te Papa researchers to Raoul islands (Kermadec)

Saturday 07/05

We finally arrived at Raoul Island in the morning after a very rough night due to nasty weather. We basically jumped from our bed, every 30 seconds following a big swell, discovering the joy of gravity at the same time. It can be funny, for a moment, and if you do not touch too much the ceiling…. The weather stayed bad until we arrived at Raoul where everyone was happy to find shelter and finally get some food in our disturbed stomach.

Luckily after that, the sky opened and let us discover the beauty of Raoul Island. We found the time to make two video and two trap samples. The clarity of the water is amazing, with a depth of field of more than 15m at 100m depth.

Beautiful sunlight on the south-western Denham Bay.

Beautiful sunlight on the south-western Denham Bay.

Tomorrow, we will have a full day working. We will be able to study the deep-sea fish fauna of the Kermadec Islands.

Speak to you soon.
Vincent

En route to the Kermadec Islands

A Te Papa expedition, in collaboration with Massey University, is going to study the fish fauna of the Kermadec Islands, some 1000km North of mainland New Zealand.

We left Tauranga aboard the MV Tranquil Image yesterday. Loading all the gear on the deck was a bit more of a challenge than usual because of the extra fuel that we had to take for this long trip going far offshore. It is now just over 24 hours that we are steaming non-stop to the North. We will need another 36 hours at least to reach our destination, Raoul Island.

Loading up the Tranquil Image with gear

Loading up the Tranquil Image with gear. More than 10km of rope for deployments of video units and fish traps are necessary.

The night was, let’s say interesting, since the sea became a little bit rougher when it was time to get a rest. I think that like everybody else aboard, I only half-slept.

But in two days, we will be able to start our sampling campaign in one of the most amazing place on earth. It is enough to keep us awake. My shipmates Charlie, Carl, Adam and Tom are all looking forward to discover this untouched ground.

Te Papa fish scientists leaving soon for the lost world: survey to the Kermadec Islands

The Kermadec Islands’ are the most isolated piece of rock that New Zealand has, some 1,000km North of Tauranga, right in the middle of very deep oceans. The isolation, recent geological origin and predominantly subtropical marine flora and fauna make them unique both nationally and internationally. I often imagine the Kermadec as one of the last untouched area on the planet.

Many species found at the Kermadecs do not occur on mainland New Zealand. The limited sampling to date has discovered that almost every major taxonomic group studied so far, with the exception of the algae and corals, has one or more species endemic to the islands.

On Wednesday, I am leaving with a team of Te Papa scientists to work on the fish fauna of this fantastic location. It’s going to be a three long days trip steaming to Raoul Island, the main island of the Kermadec. Then, we will mostly do video and collecting work, deploying systems from the shallow and colourful 50m depth zone, to the dark deep-sea waters beyond 1500m where no light penetrates. It is a very exciting time and I expect lots of new discoveries out of this survey. Hopefully, I will be able to share them with you with the help of satellite communication. Thank you technology!

More to come later…

Vincent

Boat and gear
Our Boat heavily loaded with gear during our previous survey off Kaikoura.

More about the Fish Team and our projects, including links to videos

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.

Kaikoura deep-sea field work: a few pictures

Te Papa fish team is off Kaikoura onboard the MV Star Keys to study deep-sea fish fauna.

 

We are blessed with good weather since Wednesday which allows us to being close to the minimum number of samples we have to achieve. That’ excellent news!

I though I would show you some pictures aboard the Star Keys. You will see the Kaikoura range is superb in the background.

Early in the morning aboard the Star Keys, fully loaded with scientific gear (underwater video systems, fish traps and ropes). Te Papa, photograph by Vincent Zintzen.

Early in the morning aboard the Star Keys, fully loaded with scientific gear (underwater video systems, fish traps and ropes). Te Papa, photograph by Vincent Zintzen.

 

The Kaikoura range in the background.

The Kaikoura range in the background.

 

Deep-sea shark caught with the fish traps. Te Papa, photograph by Vincent Zintzen.

Deep-sea shark caught with the fish traps. Te Papa, photograph by Vincent Zintzen.

 

Fish trap being retrieved after deployment at 700m depth. Te Papa, photograph by Vincent Zintzen.

Fish trap being retrieved after deployment at 700m depth. Te Papa, photograph by Vincent Zintzen.

 

All the best,

Vincent

Kaikoura deep-sea fieldwork: do you love slime?

Te Papa fish team is off Kaikoura onboard the MV Star Keys to study deep-sea fish fauna.

We have just finished our third day of sampling off Kaikoura. So far, everything goes well, and we are progressing at a good pace with our sampling. It has been difficult to have an internet connection, but now we have one.

We were expecting slime during our Kaikoura fieldwork, and we are not disappointed! Have you ever heart about hagfishes, sometimes better known as snot eels? They are fantastic animals, but most probably, you need to be a scientist (and a somewhat strange one) to state this and love them. Those fishes look very primitive but are extremely successful in their biotope. They have existed in one form or another for more than 300 million years on earth, placing them at the origin of vertebrates.

Vincent cleaning one hagfish specimen from its slime (and, yes, I am Belgian!). Te Papa.

Vincent cleaning one hagfish specimen from its slime (and, yes, I am Belgian!). Te Papa.

Several specimens of hagfish interlaced. The white substance is the mucous they produce. Te Papa, photograph by Vincent Zintzen.

Several specimens of hagfish interlaced. The white substance is the mucous they produce. Te Papa, photograph by Vincent Zintzen.

Hagfish teeth. Not difficult to understand that they are very efficient scavengers of the deep. Te Papa, photograph by Vincent Zintzen.

Hagfish teeth. Not difficult to understand that they are very efficient scavengers of the deep. Te Papa, photograph by Vincent Zintzen.

Their common name comes from the faculty they have to produce mucus which is exuded through the many pores they have on their skin (usually more than 200). This mucus combines with sea water and creates a characteristic slime. Amazingly, a single specimen can produce at least his weight of slime very quickly!

Three days at sea and we have already collected over 100  specimens. Definitely the most common species so far. Our clothing is covered with slime and we are fighting to extract them out the trap they have been caught with. But all those efforts are worth the price: they truly are an interesting group of fish to study.

Carl extracting hagfish specimen out of one fish trap. Te Papa, photograph by Vincent Zintzen.
Carl extracting hagfish specimen out of one fish trap. Te Papa, photograph by Vincent Zintzen.
Speak to you soon and I hope you will not have nightmares because of me…
Vincent

Deep-sea fishes survey off Kaikoura: it’s a go! (3 days before departure)

The start of a new sampling campaign is always a very exciting moment for scientists. After months of careful preparations, our fourth deep-sea sampling station is becoming a reality.

In three days, Carl, Tom and myself from Te Papa are joining our boat the Star Keys, her crew and two other scientists from Massey University for 7 days at sea. In three days, we will be sampling in deep waters off Kaikoura! Once again, we will be using video equipment and deep-sea fish traps. Similarly to what we have done in the past, we are going to deploy this scientific equipment at depth ranging from 50 to 1200 m to study diversity patterns of New Zealand fish fauna.

Scientists preparing video unit before its deployment at 1200 m depth. March 2010, Three Kings Islands. Te Papa, photograph by Vincent Zintzen

Scientists preparing video unit before its deployment at 1200 m depth. March 2010, Three Kings Islands. Te Papa, photograph by Vincent Zintzen

 

For the first time, our sampling site is located in the South Island. A guarantee for exciting discoveries! In the past year, we have worked off White Island, Great Barrier Island and the Three Kings Islands, which are all located North of Wellington. Those sites, just like Kaikoura, are particularly adapted to our sampling approach because the slope of the seabed  is very steep. It is then easy and fast to travel from one sampling station to another. Imagine, off Kaikoura, to go from a 100 m to 900 m depth, you only have to travel about 2 km on the sea surface. Steeper than the steepest hills in Wellington (and I am a cyclist, I know they can be steep…).

We should have a pretty good internet connection so that I will be able to post some news about how our work is progressing.

In the meantime, have a look at those videos from our past trips which show you the kind of amazing fish diversity New Zealand has to offer.

Speak to you soon,

Vincent

Great white shark new arrival at Te Papa

This morning, our fish team went to a small boatshed in Breaker Bay on Wellington’s south coast to pick up a great white shark.  Not your normal morning mission and a bittersweet one at that as these creatures are endagered animals and a protected species.  The shark had been ensnared in a fishing net and was dead by the time the fishermen had pulled it in.

It took 6 of us to lift it into the truck and being that close to an animal gives you a true sense of what a beautiful and perfectly made for purpose these creatures are.  The shark is 2.7 metres long so its tail fin didn’t quite fit as you can see in the picture below.  We had to carefully wrap the fin up for the trip back to Te Papa’s laboratories.

The wrapped tail fin protruding from the truck. Photo by Jane Keig

 Back at Te Papa, the team were able to give the specimen a wash and have a closer look.  Andrew Stewart, Te Papa’s Fishes Collection Manager, says that the shark is an immature male and a rare specimen as the shark was on the cusp of moving from fish as its primary food source to marine mammmals.

Cleaning out the mouth. Photo by Jane Keig

When we rolled the shark over to clean its underside, the scientists noticed small parasites which they collected for identification.

The great white shark's underside. Photo by Jane Keig.

Parasites found on the shark. Photo by Jane Keig.

These parasites were even found inside its mouth, buried into its gums and on its tongue.  Andrew says that remora fish feed on these parasites – this shark is its own fully-functioning eco-system!

Inside the mouth of a great white shark. Photo by Jane Keig.

The teeth look quite sharp and pointy but the points weren’t sharp to touch.  The sides of the teeth are serrated and I was pretty happy a strong person was holding up the jaw when I took these photos!

Sensory organs on the shark's head. Photo by Jane Keig.

The shark’s nose and head are covered with jelly-filled sensory organs that look like freckles.  These organs help it to sense electromagnetic pulses given off by its prey. I was amazed at how soft and velvety its skin felt, until I went against the grain and then  it felt quite raspy.

The shark will be frozen in our freezer to maintain the specimen’s integrity until further plans are confirmed.

Deep-sea fishes and coral garden discovered at the Three Kings Islands

Aquarium like scenery, deep-sea coral and sponge gardens (an extremely rich and rare habitat), hungry groupers and sharks, as well as a frenzy of deep-sea eel-like creatures: the Three Kings Islands have it all for you.

In April 2010, a team of five scientists from Te Papa and Massey University have been carrying research for about a week around the Three Kings Islands. These isolated stacks of rocks are located about 50km North of Northland and are stunning place to work. In addition to a feeling of being at the end of the world, this place is special for marine scientists because it is at the intersection of different water masses, concentrating an extremely diverse underwater fauna.

Our objectives were to study the fish fauna of the area, at depth ranging from 50 to 1200m. Quite a challenge, considering this place is exposed to bad weather and is famous for the strength of its tidal currents. These can be so strong that they often submerge the surface buoys which are attached to gear, making them impossible to find till they pop up again when tides slacken. A stressful time…

I probably lost hair during the week because of this, but in the end, everything ran smoothly and we deployed our video systems over 50 times, capturing some very neat footage. I have been reviewing them here in the lab and wanted to share some of the interesting sections with you.

One of the highlight of the fieldwork was the discovery of extended deep-sea coral and sponge gardens at depths ranging from 300 to 700m. This complex habitat is composed of a mixture of coral species that are adapted to the deep-sea conditions, i.e. they do not need light like their shallow-water associated species to thrive. Although poorly studied, we know that those habitats are rare, fragile and harbour a significant amount of biodiversity. They can also be important spawning and nursery grounds for many fish species. Seeing this habitat for the first time with such clear video images was soul-stirring for the team.

Coral garden Three Kings

If you want to know more about this project, you can visit the home page of the fish team.

Vincent Zintzen, Te Papa researcher.

Impressive deep-sea shark filmed during White Island survey

As research scientist for the Marsden funded project on diversity of deep-sea fishes of New Zealand, I have to analyse hundreds of hours of video footage taken during our surveys. Sometimes, amazing creatures appear on the screen, often when you least suspect it. Here is a shot that really surprised me. I virtually stepped back about a meter from my screen when a large sand tiger shark (Odontaspis ferox Risso, 1810) first swam towards me.

This is a large female, close to 400 cm in length. The species is a rare one, although it has been reported from scattered localities around the world. The sensors attached to our video system recorded a depth of 880 m, exactly the same depth as the deepest known record for the species. However, this species is sometimes spotted at scuba diving depths.

You will have noticed that we are using blue light to illuminate our footage. Indeed, at 880 m depth, there is no natural light or rather I should say no light that can be seen by a human eye. There is still a little bit of light that some deep sea organisms can use to find their prey. We are using blue LED systems because it appears that most fish species that we are interested in cannot see this kind of light. Because our light source is invisible to fishes, they are not disturbed and behave naturally in front of the camera, making our observations more accurate.

More amazing species from the deep to come later! Right now, I have started to process videos from recent fieldwork around Great Barrier Island and Three Kings Islands. In the meantime, you can learn more about our project by visiting the Te Papa Fish Team website.

Te Papa scientists recovering a video unit sent underwater to film deep-sea fish life.

Te Papa scientists recovering a video unit sent underwater to film deep-sea fish life. Note the bait bag at the front which is used to attract the fish towards the camera and the blue light at the top of the frame.

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