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Underwater tales from marine biologist at Constance Halaveli
Robin Aiello, renowned marine biologist, is at Constance Halaveli this month. Enjoy tales of her underwater adventures and find out more about your dive buddies with the special creature features she’s writing for us during her stay.
Arriving at Halaveli
It is hard to believe that I have been on this wonderful island for a week already. Time is passing too quickly and there is so much to do, and see, and explore.
I arrived last Sunday to the resort by seaplane – which in itself is a fabulous experience with wonderful views of the reefs and lagoons while enroute.
I’m staying in a Water Villa. It’s spectacular, and for me, living somewhere I can step out onto my deck and down a few stairs directly into the ocean for a snorkel is a dream come true.
Within the first few minutes of snorkelling from my deck I encountered a school of silver mullet fish hungrily feeding at the surface of the water, saw several baby blacktip reef sharks (only about 40cm long, so they were only a few days old), and spotted a manta ray passing by. Wow! What a start to my month on the island.
While I’m at Halaveli, I’ll be working with the TGI Dive Center guiding dives and snorkels and sharing all my expertise on coral reefs and the animals living there.
One of the things that has really impressed me is the diversity of the marine life on the reefs that we visit. There is just so much to see. During my stay, I’lll be writing a series of Creature Features in which I want to highlight some of the lesser well-known creatures that you can easily see while diving and snorkeling. I hope you enjoy the fun facts.
Creature Feature 1: The Redtooth Triggerfish (Odonus niger)
Also known as Black Triggerfish or Niger Triggerfish
As soon as you put your head into the waters on any of the reefs here, you can see why people come back for diving over and over again to the Maldives. The ocean is full of marine life – in every imaginable shape and colour. It is like being inside a large aquarium.
All around you fish dart to and fro – some are very curious and even change direction to pass close to your mask and look you right in the eye.
Many people ask me which is my favourite fish, and to be honest, I cannot choose – they are each so beautiful and interesting in their own way. But there is one fish that I have developed a great fondness for since being here in Halaveli – the Redtooth Triggerfish. To me, these are incredibly endearing.
Their behaviour
These fish are schooling fish that feed on zooplankton floating in the water, so they form massive groups of hundreds, if not thousands, of individuals. They hang off the edge of the reef, forming a ‘halo’ around it.
All triggerfish are easily recognised by the way they swim – they undulate their ventral (top) fin and dorsal (bottom) fin from side to side, so it almost looks like flags flapping in the breeze. When there are hundreds of fish doing this all at once, the motion is mesmerising – like a fish ballet.
Although on first glance they do not look like this would be an effective way to swim, these fish are actually highly maneuverable. They flit around in the water column catching small zooplankton (small animals that float in the ocean). In fact, when you take a close look at these fish, you can see that their tiny little mouths are upturned, pointing upwards, which makes it easier for them to grab zooplankton floating by.
Recognising the Redtooth Triggerfish
The Redtooth Triggerfish is known by many names, including Niger or Black Triggerfish. Although they can reach up to 30cm long, they are generally much smaller – about the size of you hand.
Their colours vary greatly depending on the light conditions. When schooling in deep, blue waters they appear black, but in good sunlight you can see their true bright blue or teal green colouration. And, yes, when you get a close up look at the teeth, they are in fact a dark red colour (no one seems to know why they are red). Around the head they have delicate lines that create a beautiful facial tattoo. However, for me, the most beautiful part of these fish are their long lyre-shaped tails that wave in the currents.
The triggerfish spine
All triggerfish have a shared characteristic – a spine (the ‘trigger’) on their forehead. This is a special spine that they can erect and lock into place with a second spine – much like a trigger on a gun, hence the name ‘triggerfish’.
They use this unique feature in two ways. One is for defense against being eaten by predatory fish. Imagine a fish’s surprise if it tries to swallow a triggerfish and suddenly it gets spiked in their throat by the ‘trigger’ spine.
But the most important use of the ‘trigger’ spine is for tightly wedging themselves into coral crevices or small holes in the reef while they sleep (yes…reef fish DO sleep). To stay safe, these fish find their own personal hole or crevice in the reef to hide out in. The spaces are usually so narrow that the fish need to wiggle into them by turning sideways.
Once inside the hole (usually all you can see are thee tips of the tail sticking out) the triggerfish erect their ‘trigger’ spine to lock themselves in place. In this way, any predatory fish, like a reef shark who hunts sleeping fish, cannot grab and tug them out from their holes.
When the triggerfish are ready to leave the holes, they release the ‘trigger’, lower the spine and wiggle their way out – backwards! (Yes…these are one of the few fish that I have seen that can swim tail-first!
So the next time you are diving on one of the reefs around Halaveli, take a moment to observe these little triggerfish.
A story long resting beneath the surface returns this May, as Dhawa Ihuru invites guests and ocean enthusiasts to experience the Rannamaari Dive Fest 2026, taking place on 23 May 2026.
Set against one of the Maldives’ most accessible and vibrant house reefs — recognised among the Best House Reefs in the Maldives by Travel + Leisure Asia (2025) and awarded Best Dive Resort by Travel Trade Maldives (2025) — Dhawa Ihuru offers a compelling setting for discovery both above and below the surface.
At the centre of the experience lies the Rannamaari Shipwreck, a former dredger deliberately sunk in 1999 just off the island’s shore. Today, it has evolved into a thriving artificial reef, drawing an abundance of marine life and offering an accessible yet captivating dive site for both beginners and experienced divers.
On 23 May, the island comes alive with a full-day programme designed to bring this underwater legend to life. Guests can explore the wreck through guided dives led by the resort’s PADI-certified Dive Centre, alongside activities such as underwater treasure hunts, marine discovery sessions, and interactive experiences with the resort’s Marine Lab.
Founded in 2004 as the first of its kind in the Maldives, our Marine Lab continues to pioneer reef protection and restoration efforts. During the festival, guests can engage with our marine biologists and gain deeper information into the ecosystems that sustain island life.
As part of the experience, guests will also be introduced to the resort’s pioneering underwater initiatives, including the Barnacle Project — the Maldives’ first electric reef, launched in 1996 — and the Necklace Reef, established in 1998. Today, these structures have evolved into thriving marine habitats, supporting coral growth and attracting a rich diversity of fish and marine life.
Beyond diving, the festival extends across the island with a vibrant mix of experiences for all. From watersports and island crafts to relaxed beachfront dining and family-friendly activities, the event reflects Dhawa Ihuru’s easy-going, all-inclusive approach – where everything is thoughtfully in place, so guests can simply arrive and enjoy.
“The Rannamaari is more than a shipwreck – it is a living symbol of how responsible marine initiatives can transform history into habitat. From its unexpected sinking in 1999 to becoming a thriving artificial reef and the heart of our signature dive events, Rannamaari reflects our commitment to marine conservation, meaningful guest experiences, and celebrating the Maldives’ deep connection with the ocean,” said Mujuthaba Ali, Marine Recreations Manager, Marine Centre, of Dhawa Ihuru and Banyan Tree Vabbinfaru.
Just 25 minutes by speedboat from Velana International Airport, Dhawa Ihuru offers seamless access to an island where reef, wreck, and relaxed island living come together.
Part of the Lifestyle Collection of Sun Siyam, Siyam World has never really done “ordinary.” And with two of its most high-energy island experiences now firmly on the weekly roster, families, groups and anyone with a competitive streak have even more reason to book that trip.
Lace Up: The Siyam World 3K Wellness Run
Every week, guests gather at the start line for the Siyam World 3K Wellness Run, where good vibes meet great views. Clearly marked pathways guide the way to a marathon-style route around the island but the rules are simple: go at your own pace, take in the views, and enjoy the moment. Run it, jog it, or power-walk it with a smoothie in hand. No judgment here. Cross the finish line and you’ll earn an exclusive Siyam World 3K Run badge, the most stylish souvenir you’ll take home, and the ultimate bragging rights for completing a 3K on the most epic island in the Maldives. It’s all about moving, smiling, and enjoying the moment.
Game Faces On: The Amazing Race
For families and groups ready to turn up the heat, The Amazing Race is exactly what it sounds like, chaotic, competitive, and seriously good fun. Teams of up to five kick off at the starting point before racing across the island, completing challenges and hunting down clues at every turn. Five challenges. Multiple locations. Zero time to waste. It’s a test of speed, teamwork and quick thinking with a generous helping of chaos thrown in for good measure. And the rewards? Very worth running for. The winning team takes home a complimentary excursion, second place hits the waves on a banana boat, and third place gets behind the wheel at the Maldives’ first-ever resort based electric go-kart circuit. Not a bad consolation prize.
Whether you’re chasing that runner’s high, racing your kids across the island, or just looking for something a little different from the usual sun-lounger routine, Siyam World delivers. Every experience is designed to bring people together, keep the energy high, and create the kind of memories that don’t fade with the tan.
A World Beyond Your Wildest
Siyam World’s summer offer makes it easier than ever to say yes. Save up to 45% off, enjoy USD 150 resort credit, and settle in to Premium 24hrs WOW! All-inclusive from the moment you arrive. Stay 4 nights and a seaplane transfer is on the house — stay 7 and that extends to two guests, plus a floating breakfast for two. And for families, children under 12 stay completely free when sharing with adults. The only question is how long you can stay. Book your stay now.
On Saturday, 25 April 2026, SO/ Maldives will stage its “Fight Fit” island activation as part of the resort’s ongoing 120 Days Fitness Challenge, bringing together fitness, wellness and local collaboration in a resort-wide programme.
Developed in partnership with Fight Soul Maldives, a local fitness collective focused on combat sports, the activation is designed to offer guests both participation and live viewing experiences while also bringing a local element into the resort’s wellness programming.
A key part of the activation is the Muay Thai Guest Workshop, where guests will have the opportunity to train with fighters from Fight Soul Maldives. Open to different fitness levels, the sessions will introduce the basics of Muay Thai through drills, technique-based training and group activity.
The programme will extend across the island through a series of activities including sunrise yoga, beach combat training, aqua yoga accompanied by DJ music, and sunset fight showcases. According to the resort, the aim is to combine physical activity with the island setting through a range of structured wellness experiences.
The activation will also include a healthy menu developed to support fitness and balanced living, in line with the resort’s wider wellness focus.
Guests will also be invited to take part in a skincare workshop and ritual linked to the launch of products from Comfort Zone. The experience will introduce skincare practices based on science and sustainability as part of the broader wellness programme.
In the evening, the programme will continue with foam parties, fire dance performances, and live Muay Thai and kickboxing exhibitions featuring athletes from Fight Soul Maldives.
Through “Fight Fit”, SO/ Maldives is presenting a wellness-led island activation that combines fitness, lifestyle programming and collaboration with local talent.
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