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Cendrawasih’s whale sharks…. not such homebodies after all



For the past five years, Cendrawasih Bay’s friendly whale shark population has been attracting a lot of attention, primarily because of the near-certainty of having outstanding (and lengthy!) whale shark encounters during a visit to the region. Unlike many of the other known whale shark aggregations in the world (such as Ningaloo, Isla Mujeres, Belize, Galapagos and Donsol), which are highly seasonal, we now know with certainty that Cendrawasih has whale sharks present in the bay year round. Indeed, based on our observations combined with photos submitted by visitors to our BHS whale shark database, some highly-recognizeable individuals seem to be present throughout the year. Of course, one of the surest ways to confirm this is to monitor individual animals’ movements through satellite tagging – which is exactly what we’ve been doing in collaboration with the Cendrawasih Bay National Park Authority and Pak Bram Maruanaya and his local Kalilemon homestay in Kwatisore.


Capture5Since June 2015, we’ve been able to tag 15 male whale sharks (ranging in size from 3 to 7 m in length) from Cendrawasih, using custom-made fin-mounted satellite tags by Wildlife Computers. These fin-mount tags have extended battery life which we hope will provide data for up to two years, and we’ve been delighted with their performance to date. All but one of the tags has been transmitting data very regularly (on average every 2-5 days) – basically each time one of the tagged sharks spends enough time on the surface for the tag to uplink to the ARGOS satellite network.

As previously reported back in November, the initial data received from June through October 2015 seemed to confirm what many suspected – that Cendrawasih whale sharks are largely “homebodies”, preferring to stay close to shore and feed upon the abundant ikan puri baitfish schools that abound in the coastal bays and estuarine areas of the southern and eastern coastlines of Cendrawasih. Which of course is a great thing for BHS marine tourism, as it means visitors can pretty much plan a trip any time of the year and have a very good chance of excellent whale shark interactions.

By December, however, we started to observe some very different behaviours that indicate Cendrawasih’s whale sharks might not be such homebodies after all! Just before Christmas, four of the sharks almost simultaneously moved towards the small exit to the bay between the eastern tip of Yapen Island and the Papuan mainland. Though two soon turned back, both “Jude” and “Wally” proceeded down the coastline towards Jayapura. Jude eventually turned back and returned to Kwatisore, but Wally continued down the coast – becoming the first of our tagged sharks to become an international visitor when he crossed into PNG waters in early January. While he appeared at one point to be returning to Cendrawasih (making it as far west as Jayapura), he’s since returned to the Wewak region of PNG (near the Sepik River outlet) and seems to be happily enjoying an extended vacation there!


Similarly, one of our most recently tagged whale sharks, Ke’Opulupulu, headed almost immediately north into the center of the Bay (near the Auri Islands and atolls), then navigated to the south coast of Biak and Supiori Islands, where he’s remained for the past few weeks.



But horizontal movements are only part of the excitement we’ve recently recorded. The past 3 months have also seen a dramatic increase in deep-diving behaviour of many of our tagged sharks. While we did previously report a 672m deep diving record in October, we’ve now seen four of our sharks venture below 1000m depth, with the aptly-named “Moby” smashing the depth record (but fortunately not his tag’s depth gauge!) at 1416m!!! Even the “wee” 3m “Fijubeca” has dived to 700m depth. It’s still not clear why the sharks have shown such deep diving behaviour over the past few months – perhaps the El-Nino warmed surface waters are not providing enough food and they are searching for deeper plankton…


Overall, we’re delighted to see these fin-mount tags proving so successful at divulging some of the secrets of Cendrawasih’s whale sharks. Its particularly noteworthy that the first 5 months’ of data seemed to simply confirm our scattered direct observations, but the past 4 months have revealed numerous exciting behaviours we didn’t expect. Who knows what the next few months’ data might reveal? Stay tuned and we’ll happily report back as the data keeps flowing in. And please remember – you too can contribute to our expanding knowledge and understanding of the charismatic megafauna of the Bird’s Head by contributing your photo IDs and observations of whale sharks and manta rays in the region to the databases maintained by our site.


Mark Erdmann is Conservation International’s Vice President of Asia Pacific Marine Programs. Though now based in New Zealand after 23 years in Indonesia, he is still intimately involved with the Bird’s Head Seascape and frequently disappears into its remote corners for weeks on end….

Shawn Heinrichs is an Emmy Award-winning cinematographer, photographer and marine conservationist. An independent filmmaker, he is the founder of Blue Sphere Media, a production company specializing in underwater, adventure and conservation media. His work was recently featured in the film Racing Extinction.

A special thanks to Audrey, Shannon and Dennis Wong, Sally Timpson, and the management and guests of the True North expedition vessel for generously sponsoring the fin-mount whale shark satellite tags reported here, to Patti Seery and her amazing staff and crew of the Si Datu Buah liveaboard for hosting our most recent deployment expedition, and to OceanMax for continuing to support the tagging program with PropSpeed silicone foul-release coating for our satellite tags.

Dr. Mark Erdmann's work largely focuses on the management of marine protected areas, as well as research on reef fish and mantis shrimp biodiversity, satellite tracking of endangered sharks and rays, and genetic connectivity in MPA networks. Mark is the Vice President of CI’s Asia-Pacific marine programs, tasked with providing strategic guidance and technical and fundraising support to focal marine programs in CI's Asia Pacific Field Division, including especially the Bird's Head Seascape and Pacific Oceanscape initiatives, as well as marine programs in China, the Philippines, Timor-Leste, Papua New Guinea, New Caledonia, Samoa and the Coral Triangle Initiative (CTI). Mark is a coral reef ecologist (Ph.D. University of California, Berkeley) who has recently moved to New Zealand, and previously lived and worked in Indonesia for 23 years. During his time there he launched and directed the Bird’s Head Seascape initiative for over a decade, developing it into one of CI's flagship marine programs globally. Mark is an avid diver and has logged over 10,000 scuba dives while surveying marine biodiversity throughout the region, discovering and describing over 150 new species of reef fish and mantis shrimp in the process. He has published over 140 scientific articles and four books, including most recently the three-volume set "Reef Fishes of the East Indies" with colleague Dr. Gerald Allen, and has been a scientific advisor to numerous natural history documentary films for the BBC, National Geographic and NHK. Erdmann was awarded a Pew Fellowship in Marine Conservation in 2004 for his work in marine conservation education and training for Indonesian schoolchildren, members of the press, and the law enforcement community. Though his work is now largely focused on the management of marine protected areas, his continuing research interests include reef fish and mantis shrimp biodiversity, satellite and acoustic telemetry of endangered elasmobranch species, and genetic connectivity in MPA networks. In recent years Mark has devoted significant time to supporting the Indonesian government in its efforts to improve conservation and management of its sharks and rays, including the designation of the world’s largest manta ray sanctuary in 2014. Mark maintains a research associate position with the California Academy of Sciences, supervises several Master's and PhD students at the University of Auckland, and is active on the boards of a number of NGOs working in the Coral Triangle, including Yayasan Kalabia, Reef Check Indonesia, and Manta Trust. Mark and his wife Arnaz and three children (Mica, Brahm and Cruz) live in Auckland, where he maintains a deep personal commitment to do whatever is necessary to ensure his children will be able to enjoy the same high-quality underwater experiences that continue to provide the inspiration for his dedication to the marine environment.


The Rescue – available on Disney+ tomorrow (Watch Trailer)



If you missed the recent cinema debut of The Rescue film, you can watch it on streaming channel Disney+ from tomorrow December 3rd.

From Academy Award®-winning filmmakers E. Chai Vasarhelyi and Jimmy Chin (Free Solo), The Rescue is the edge-of-your-seat account of the rescue of 12 Thai school boys and their soccer coach from a flooded cave system in 2018.

The Rescue chronicles the dramatic rescue of the boys and their coach, trapped deep inside a flooded cave. Academy Award®-winning directors and producers E. Chai Vasarhelyi and Jimmy Chin reveal the perilous world of cave diving, the bravery of the rescuers, and the dedication of an entire community that made great sacrifices to save these young boys. An outing to explore a nearby system of caves after soccer practice transformed into a two-week saga of survival and a story that would capture the world’s attention. With exclusive access and never-before-seen footage from the rescue, the film tells the story of the imagination, determination and unprecedented teamwork displayed during this heroic edge-of-your-seat mission with life-or-death stakes.

Check back for our review of The Rescue soon!

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Marine Life & Conservation

Shark Guardian investigation finds endangered sharks for sale in Taiwan



A field investigation into Taiwan’s shark fin industry was conducted by Shark Guardian between December 2020 and March 2021. The investigation obtained documentary evidence of fins from endangered shark species being openly offered for sale by over half of all shark fin traders surveyed in Taiwan’s southern fishing port of Kaohsiung.

Of the 13 shark fin processing and trading companies visited, more than half were found to be trading CITES- listed fins, and seven had shark fins from CITES Appendix II-listed species as part of their product range. One company saidthere was no difference in selling protected or unprotected species. Protected sharks’ products usually create a problem for international shipping only.”

The new report details how seven out of thirteen traders surveyed in Taiwan were found to be selling shark fins from silky sharks, oceanic whitetip sharks, mako sharks, thresher sharks and great white sharks in broad daylight – in contravention of Taiwanese and international law.

Over a three-month period, Shark Guardian investigators witnessed multiple shipments of shark fins from endangered species being unloaded at Donggang fish market which is in Taiwan’s southern city of Kaohsiung.

Alex Hofford, Marine Wildlife Campaigner with Shark Guardian, said “To save sharks and the marine environment, Taiwanese authorities should implement an immediate crackdown on its cruel and unsustainable shark fin trade, and should tighten up local laws to ban the domestic sale of shark fin as well as better enforce its international obligations under CITES. It is also high time that the Taiwanese government should rein in its out-of-control distant water tuna fishing fleet, who are a major supplier shark fin to Chinese markets. Whilst Taiwan is a beacon of democratic and progressive values in Asia, it is allowing its unsustainable and often crime-ridden fisheries sector to rape and pillage our ocean with impunity. This must stop. Taiwan needs to show leadership in environmental protection and must quickly clean up its act as regards its sleazy shark fisheries and trade sectors.”

During our investigation, Shark Guardian also found evidence of Taiwan-based online retailers selling fins of endangered species of shark in contravention of local and international law.

According to WWF, a third of all sharks and rays are threatened with extinction, yet fishing and trading in unsustainable shark fin remains a highly profitable, but environmentally destructive, enterprise for Taiwanese companies operating out of Kaohsiung.

Brendon Sing, Co-Director of Shark Guardian said “Clearly more must be done to protect sharks globally. There are over 500 known shark species with only a handful of them listed under CITES. Even then, CITES listed sharks are still traded illegally where monitoring and enforcement lack any power and expose loopholes in the system. As long as this continues, there is no real protection for any shark species regardless of CITES listing or not. Taiwan must be responsible and take positive action in response to this report.”

Shark Guardian believes that excessively large profit margins are the main reason why Taiwan has never acted to rein in its shark fisheries and trade.

Shark Guardian hopes that Taiwan can apply its progressive values towards preserving the marine environment by imposing a comprehensive ban on the physical and online selling all species of shark fin in Taiwan. Such a ban would go above and beyond what is required under international law, and Taiwan’s domestic laws can be changed with public support.

For more information about Shark Guardian visit their website by clicking here.

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Egypt | Safaga, Brothers & Elphinstone | 27 January – 04 February 2022 | Emperor Elite

Jump on board this famous Red Sea liveaboard and enjoy diving the famous wrecks of the Red Sea with this fantastic special offer.  Emperor Elite offers a contemporary living space combined with the best itineraries available in the Red Sea.

Price NOW from just £975 per person based on sharing a twin cabin including:

  • Flights from London Gatwick to Hurghada with 23kgs baggage
  • 7 nights in shared cabin
  • 3 meals a day, soft drinks, red wine with dinner
  • 6 days’ diving, guide, 12ltr tank & weights, Marine Park fees and port departure fees
  • Free Nitrox

Booking deadline: Subject to availability.

Call Diverse Travel on 01473 852002 or email

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