Underwater
Marine biologist reveals what’s underwater at Halaveli

Here is third week’s instalment from marine biologist Robin Aiello sees her come face to face with the awe-inspiring whalesharks in the waters off Halaveli.
Whiptail Ray
It has been another amazing week full of beautiful dives, snorkels, lagoon cruises and island walks. The weather has been clear and warm, and the seas so calm that you can do an entire marine biology session from the surface without even getting wet.
I have, in fact, been spending hours on the jetty with guests looking down into the sea and spotting some fantastic animals. We have many harmless blacktip reef sharks that slowly cruise back and forth under the jetty, whiptail rays that look almost like eagles flying through the water, unicorn fish with their long horns sticking out from their foreheads, long slender coronet fish with their huge extended mouths, and bluefin trevallies (also called jacks) chasing schools of small silver fish.
Bluefin Trevallies
The trevallies (jacks) always put on an exciting show for us as they stalk and hunt the small silver fish that form massive schools in the very shallow water at the beach.
Small groups of 3 – 6 bluefin trevallies swim up and down the beach, getting closer and closer to the shore and forcing the small fish to form tighter and tighter schools – it is like cowboys rounding up the cattle on a range.
They do this for some time, then, without any warning, there is a huge commotion. The trevallies have decided it is time to strike, and change direction at full speed (which is really really fast) and dash through the school, grabbing fish as they go. The small silver fish, in response, take off in all directions like a firework display. They will even jump out of the water and land on the beach in their sheer panic to get away.
But, there is no where for the small fish to hide. Suddenly other predatory fish join the feeding frenzy, and if that is not bad enough, the seabirds and herons fly in from all directions to join the mayhem and pounce on any fish they can. The whole frenzied activity lasts only a few seconds, but what excitement! Sometimes I feel sorry for the poor little fish!
An unplanned evening snorkel
Probably the most unusual thing that I have seen in a long time was spotted one evening from the jetty. I was heading to dinner, all dressed up, and one of the guests asked me what it was – I had no idea – didn’t even know if it was manmade or natural.
So I ran back to my villa and grabbed my snorkeling gear and jumped into the water.
This thing was weird! At first, I had no idea what it was. It was in constant motion, rolling around and undulating, but I soon discovered it was the water movement that caused it to move – it was not actually alive. It was slimy and felt like thick mucous, and to add to the bafflement, there were thousands of little pink/purple balls embedded in it.
Finally it dawned on me that it had to be some sort of egg case – most likely molluscan from either a snail or a squid. After a couple of hours of research I discovered that it was, in fact, the egg case of a very large squid that reaches a size of over 1 metre called the Diamondback Squid. This squid would have laid the egg case out in the lagoon and the tides, currents and waves washed it into the shallows. Very interesting.
Diving with whalesharks
Yesterday, though, was the real highlight of my whole visit – every Sunday the Dive Center offers a day trip to find and snorkel with whalesharks. And what a day we had!
Thanks to our amazing boat crew, and of course the legendary snorkel guide Santana, we had the wonderful experience of swimming with 3 large whalesharks. Amazing! It is no easy feat to find a whaleshark – since they are fish, they do not come to the surface to breath like whales, so the only way to find them is to patrol an area – up and down along the coast. The crew stand lookouts on the roof of the boat looking for a large dark shadow in the water.
Then, if one is spotted, there is a flurry of activity as we get on our gear and jump overboard. At this point, the race begins. Although these huge animals are barely moving a fin at all, they maintain such a fast speed that we as mere human snorkellers must kick and kick and kick as fast as possible to keep up with them. They do not seem to be bothered by us at all – in fact, on several occasions they appeared to be curious and changed direction to come right up close underneath – within only a few metres of us.
When they are this close, they take your breath away. They really are special creatures!
They are so spectacular, that this creature will be the topic of my Creature Feature for this week.
Creature Feature – Whalesharks
Whalesharks are well known to frequent a spot on the southern part of the Ari Atoll – no one really knows why they ‘hangout’ in this area. But they seem to be mainly young-adult males that are about 6–8 metres in length.
Although this is considered relatively small for a whaleshark (they can reach sizes of over 12m) they are still incredibly impressive. In fact, whalesharks are the largest fish in the world.
Whalesharks are a type of shark – not a whale. They, like all sharks, have a cartilaginous skeleton rather than bone, have what are called denticles covering their skin instead of scales, do not have an air bladder, but use a liver full of oil for buoyancy, and of course they have ‘replaceable’ teeth rather than only one set like most reef fish. Sharks have hundreds of teeth and can go through as many as 30,000 teeth during their lifetime.
What happens is that teeth that form the ‘front-row’ periodically fall out, and within only a few days another tooth that behind in the ‘second-row’ will rotate into position. It is kind of like a conveyor belt of teeth. In this manner the shark always has fresh, sharp teeth! Whalesharks, although they do not use them, actually have about 300 very small teeth.
How whalesharks feed
So how does a whaleshark feed if it does not use teeth? Well, these giants of the sea, feed on some of the smallest animals in the ocean, plankton, by a method called filtering feeding.
Inside their mouths they have an unique system of filter-pads that trap all the small plankton – a lot like a sieve.
Whalesharks feed in two ways – ‘gulping’ and ‘ram feeding’. If there is plenty of concentrated plankton in the water, these sharks will stay in one place and take in huge gulps of water full of plankton.
If, however, the plankton is spread out in the water, then the sharks will swim at an average of 4km per hour with their mouths open – when they have enough food, they will swallow, then resume feeding – this is ‘ram-feeding’.
To watch them feed is incredible. They have huge mouths – up to 1.5 metres wide and they can filter over 300,000 litres of seawater per hour.
Identifying whalesharks by their spots
Other than the sheer immense size of these fish, the other really noticeable feature is the patterning. They are fully covered with spots and dots, and some lines – really beautiful.
They almost look like a bright starry night sky. In fact, a few years ago a couple of scientists came up with the interesting idea to use a computer program designed for tracking stars to document the spots on individual whalesharks.
Since the patterning on each whaleshark is unique for that individual (much like our human fingerprints are unique to each person), scientists have been able to compile a global database of whalesharks from photographs of their spots.
So, when you visit Halaveli Resort, be sure to take the trip out looking for whalesharks – it is fantastic!
Excursions
COMO Maalifushi and Cocoa Island join global tribute to women divers on 10th PADI Dive Day

In celebration of the 10th anniversary of PADI Women’s Dive Day, COMO Maalifushi and COMO Cocoa Island will host dedicated dive experiences in tribute to the passion, resilience, and adventurous spirit of women divers worldwide. Scheduled for Saturday, 19 July 2025, this global initiative brings together divers in a united effort to increase female participation in scuba diving, while also promoting marine conservation and inclusivity beneath the waves.
On this date, both COMO properties in the Maldives will organise specially guided dives exclusively for certified female guests. These experiences offer participants the chance to explore the region’s thriving marine ecosystems and connect with a broader movement that champions gender inclusivity and environmental stewardship in the diving community.
Situated in the unspoilt waters of the Maldives, COMO Maalifushi provides access to a range of renowned dive sites, including coral gardens and manta ray cleaning stations. These underwater landscapes are ideal for divers seeking meaningful interactions with marine life in a setting of natural splendour.
Peter Nilsson, Managing Director of COMO Hotels and Resorts in the Maldives, commented, “At COMO, we are committed to empowering women not only on land but also beneath the surface of the ocean. PADI Women’s Dive Day gives us a platform to honour values such as inclusivity, passion, and marine conservation — all of which resonate strongly with our brand ethos. We are proud to create experiences that allow our guests to forge lasting connections with the natural world in transformative and memorable ways.”
At COMO Cocoa Island, participants can expect similarly enriching experiences, with access to gentle reef slopes, crystal-clear lagoons, and a diversity of marine life. Supported by expert marine guides, the dives are designed to be both empowering and educational, fostering a deeper appreciation of the ocean’s delicate balance.
First launched in 2015, PADI Women’s Dive Day has grown into the world’s largest celebration of women in diving. This year, both COMO resorts aim to inspire a new wave of female divers while reinforcing the importance of sustainability and unity beneath the surface.
Action
Netflix’s ‘All the Sharks’ puts global spotlight on tiger shark paradise in Maldives’ Fuvahmulah

The first episode of Netflix’s new competition series All the Sharks is set in Fuvahmulah, Maldives — an island now confirmed by scientists as home to the largest documented aggregation of tiger sharks in the world.
The global series, which premiered Friday, follows four teams of marine experts racing to photograph the most shark species across six biodiverse marine locations. Its opening episode brings viewers into the waters of Fuvahmulah, a shark diving hotspot in the southern Maldives, where recent research has identified 239 individual tiger sharks over six years — more than any other single location globally.
A peer-reviewed study published earlier this year in Nature.com, led by Lennart Vossgaetter of the Leibniz Centre for Tropical Marine Research in Germany, used non-invasive photo identification to confirm Fuvahmulah’s ecological significance. Researchers found that adult female tiger sharks show strong site fidelity, remaining in the island’s warm, food-rich waters for extended periods during gestation.
The big picture: Science meets streaming in Fuvahmulah
Fuvahmulah, long renowned by divers for consistent encounters with tiger sharks, now features prominently in both marine research and global entertainment. The Netflix episode captures this extraordinary setting as part of a larger series spanning Japan, South Africa, the Galapagos, Australia and the Bahamas.
According to the study, Fuvahmulah’s waters — influenced by oceanic currents and lacking a surrounding atoll — provide ideal reproductive conditions for tiger sharks, particularly pregnant females. The research team documented the world’s highest number of individual tiger sharks identified in one confined marine area.
The scientists described Fuvahmulah as a “bright spot” for tiger shark conservation in the Indian Ocean, bolstered by the Maldives’ national shark sanctuary status.
Zoom in: A friendly global shark race
All the Sharks follows four two-person teams — Shark Docs, Gills Gone Wild, British Bait Off and Land Sharks — competing to photograph the most and rarest shark species at each location.
The series is hosted by Tom “The Blowfish” Hird, a marine biologist known for his dramatic delivery and braided pirate-style beard.
Points are awarded based on species rarity, with the season’s top team winning US$50,000 for a marine conservation charity of their choice.
Though the show leans on reality TV conventions, its content remains grounded in ocean science and conservation. Fuvahmulah’s inclusion in the series serves as both a dramatic setting and an educational entry point into the world of shark biology and environmental protection.
Details: Unregulated tourism meets scientific concern
The Nature.com study also raised concerns about the rapid growth of shark tourism in Fuvahmulah, particularly at the island’s famed “Tiger Harbour.” While tourism provides a major economic boost for the island, shark provisioning and diving currently remain unregulated, with no official national guidelines.
The researchers warned that the absence of regulation — including standardised safety measures and environmental practices — could jeopardise both shark welfare and the long-term viability of the tourism industry.
They pointed to successful models in countries like Fiji, where community-managed marine protected areas (MPAs) have been implemented to balance economic activity with ecological sustainability. The study recommended similar frameworks for the Maldives, calling for inclusive stakeholder management plans to ensure responsible ecotourism in one of the world’s most important shark sanctuaries.
Why it matters: Maldives in the global spotlight
The series premiere and the scientific findings together shine a global spotlight on the Maldives’ critical role in shark conservation. As the world celebrates 50 years since Jaws and enters another summer of shark-themed content, All the Sharks provides a rare blend of adventure, education and scientific relevance.
The show includes conservation graphics detailing the biology and threatened status of each shark species, shifting the narrative from fear to appreciation. For viewers — and for the Maldives — the message is clear: these apex predators are essential to ocean health and worthy of protection.
The bottom line: Fuvahmulah is both spectacle and sanctuary
As All the Sharks captures the thrill of underwater discovery, Fuvahmulah emerges not only as a top-tier dive destination but as one of the most ecologically important shark habitats in the world. With Netflix bringing its waters to millions of viewers and science affirming its global conservation value, the moment calls for action — to protect, to regulate and to preserve this unique corner of the Maldives for generations to come.
Action
Dive for free at Kandooma, just named Maldives’ leading dive resort

Holiday Inn Resort Kandooma Maldives has been crowned ‘Maldives Leading Dive Resort 2025’ at the prestigious World Travel Awards, marking a major milestone as the inaugural winner of this newly introduced category.
The announcement was made at a glittering gala ceremony held on 29 June in Tanzania, attended by tourism and hospitality leaders from across Africa and the Indian Ocean. The accolade honours Kandooma’s commitment to exceptional diving experiences and innovation in accessible underwater tourism.
“We’re surrounded by some of the most awe-inspiring marine life in the Maldives – it’s truly like diving in a living aquarium,” said Mark Eletr, General Manager of Holiday Inn Resort Kandooma Maldives. “From graceful manta rays and reef sharks to turtles, moray eels, and vast schools of tropical fish, our waters are teeming with life.”
Just minutes from the resort are world-class dive sites including Kandooma Thila, a renowned cleaning station for grey reef sharks; Guraidhoo Corner, famous for its strong currents and pelagic encounters; and Medhu Faru, where divers drift alongside vibrant coral walls. The close proximity of these sites allows for up to three dives a day – ideal for enthusiasts chasing underwater thrills.
Central to Kandooma’s diving success is its bold ‘Dive Free’ initiative – a game-changer for the scuba community. Guests who stay three nights or more and are certified divers receive two complimentary boat dives per day, including equipment and professional guidance.
“Diving can be an expensive pursuit, so we decided to flip the script,” Eletr added. “Our ‘Dive Free’ program removes the barriers and makes the underwater magic of the Maldives accessible to more people than ever.”
Kandooma’s on-site 5-star PADI dive centre offers courses for beginners through to advanced, specialty certifications and refreshers, as well as private excursions for underwater photography, night dives, and wreck explorations.
With its commitment to sustainability, marine preservation, and guest experience, Holiday Inn Resort Kandooma Maldives has proven that world-class diving doesn’t have to come with a luxury price tag – just a sense of adventure.
For more information or to book a diving escape, visit: www.maldives.holidayinnresorts.com
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