Save Our Seas Blogs

16 August 2010

You Gotta Be Kidding Me – A Third Species of Manta?

Posted by Andrea Marshall in Manta Rays, Mozambique Tags: , , ,

Holbox is the manta ray and whale shark capital of the Gulf

As I write this, I am sitting at the airport in Cancun, Mexico. I have this surreal feeling that something huge just happened to me, but I still cannot overcome the feeling that I am in a dream. Everything just seems a little too bizarre, a little too out of the ordinary.

A little over a week ago, I touched down in Mexico and was given a warm welcome by a fabulous team of Mexican biologists and conservationists. Considering the rural location, I was impressed at both the size of their strong and dedicated team and what they have been able to accomplish out here with respect to their marine protected areas. My heart swelled with hope as I thought about the future possibilities in Mozambique.

Almost immediately, I headed out to the tiny island of Holbox, a world-renowned aggregation site for whale sharks, to meet up with Silvia Hinojosa, the manta research team leader. It was early and I was battered, bruised and a little deflated from the Brazilian leg of my journey, not to mention a week behind schedule. While the scenery surrounding me was breathtaking, I have to admit that my fatigue was starting to get the better of me. But then she uttered four little magic words and my determination was instantly restored, “The mantas are here.”

The next three days passed in a whirlwind. There were mantas, there were tags, there was joy and there was guacamole.  What was this place and why had I never been here before? It seemed like utopia. (more…)

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26 July 2010

Making History in Brazil!

Diving and Laje de Santos

They say good things come to those who are patient. I never really gave this saying too much thought until just recently…In the name of manta research I have spent six solid weeks (during the winter of 2009 and winter of 2010) diving a remote offshore rock called Laje de Santos in the south of Brazil looking for the elusive giant manta (Manta birostris). Until today, I have searched in vain. I was the one that actually chose this location for part of the worldwide study on this newly discovered species of ray, as this little spec of a rock is the largest documented aggregation site for this species in the southern Atlantic Ocean. But, to tell you the truth, despite my normal determined outlook when working in the field, I was really beginning to loose hope (and that’s pretty bad, since my current international research campaign is ironically named “Ray of Hope’).

Andrea in the field at Laje

But that’s the funny thing about marine field research and, I suppose, diving in general. It doesn’t matter what the ocean throws at you…countless hours of searching, dozens of dives in cold, green water, boat trip after boat trip on rough, windy seas…all of the excruciating effort and disappointment literally seems melt away the second the animal that you have been searching for appears. Your breath catches in your throat, time stands still and everything seems to make sense in the world. And this is why we divers torture ourselves by squeezing into unbearably uncomfortable wetsuits, why we swim around the sea covered in all kinds of tanks and hoses, and why we spend all of our money and time bobbing around in the middle of the ocean. It is precisely for this sensation and these encounters with special marine creatures. For the majority of us, the most precious encounters are with large, elusive megafauna like sharks, whales and dolphins. The object of my affection, of course, is the manta ray.
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6 November 2009

Can Manta Rays Recognise People?

Posted by Jon Trusler in SOSF News Tags: , , ,

Could it be that the world’s brainiest fish is able to remember a good deed and show gratitude? An experience by SOSF project leader Guy Stevens certainly seems to point that way. On a recent dive, he found and freed a giant manta caught in some fishing line. Incredibly the manta allowed Guy to swim over to it and cut the line off without struggling or trying to swim away. Guy counts this as one of his most memorable experiences underwater. Guy identified the manta and then finished the dive hoping one day to see the manta again.

And a few days later he did. Diving with a group of other divers Guy saw and recognised the manta he had freed only a few days earlier. Read Guy’s full version of the encounter.

Guy Stevens tells us about the manta he rescued. (Go to video page or watch on YouTube)

Guy is featured in the BBC series Natural World on Wednesday 11 November 2009 (on BBC2 at 8pm, and afterwards online via BBC I-Player). The film Andrea: Queen of Mantas is about the revelatory manta research by SOSF-funded scientist Andrea Marshall.

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19 September 2009

Shark Hunters

Manta Rays and whale sharks have been somewhat scarce at Hanifaru for the last 10 days, with a combination of rough seas, low plankton concentrations and neap tides the likely culprits for their absence. After a few weeks of thick clouds and torrential rain, the sun is now finally beginning to grace the skies again and has kick started the famed productivity for which these seas are known. Across much of the atoll the visibility has dropped to less than 7 m and the water’s greenish tinge indicates it is already dense with phytoplankton. Zooplankton armies are already on the march to feast on the phytoplankton and form the foundations of the manta ray and whale shark food web. In a few days time around the full moon another bout of spectacular mass feeding should be upon us.

In the meantime I took advantage of these manta-less days and visited Dhonfanu, a Small Island situated less then 1 km from Hanifaru Bay. Dhonfanu is one of the only two communities in Baa Atoll that has a long history of hunting whale sharks and manta rays. Whale sharks were always the preferred prize with the up to 200 liters of oil in their livers used by the islands boat builders to seal the hulls of fishing boats (dhonies) from the elements. Manta Rays were only targeted when whale sharks were scarce as their livers held far less oil. There is also talk that the leathery skin of manta rays was used to cover Bodu Beru drums, an important centerpiece in many Maldivian celebrations and rituals. The hides of stingrays were definitely used, but my hunt for an actual manta ray skin drum or definitive oral history still continuous.

The tools of ex-whale shark and manta ray hunters on Dhonfanu Island, Baa Atoll, Maldives.

The tools of ex-whale shark and manta ray hunters on Dhonfanu Island, Baa Atoll, Maldives.

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21 August 2009

Worldwide manta ray satellite tagging study

Posted by Andrea Marshall in Manta Rays, Mozambique Tags: , , ,

tag cutout copyThe Foundation for the Protection of Marine Megafauna has begun a worldwide study on the behaviour and migratory patterns of the newly-described giant manta ray (Manta birostris). Initial observations suggest that this species may be more migratory and oceanic than its smaller relative, the reef manta (Manta alfredi), which is typically resident to coastlines or island groups. To determine if the giants indeed travel great distances across oceans or along coastlines, Dr. Andrea Marshall, Dr. Simon Pierce and colleague Dr. Juerg Brunnschweiler sourced funding from the Save Our Seas Foundation to begin a worldwide study on their movement patterns. They hope to travel to several locations across the globe, teaming up with other local researchers or dive operators along the way.

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