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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.
Excursions
From first visit to thousand dives: Love story anchored at Bandos Maldives

Bandos Maldives recently marked a significant milestone with two of its most loyal guests, Kate and Andy, who have shared a long-standing connection with the island.
Andy achieved an impressive feat by completing his 900th dive, all undertaken with Dive Bandos. His wife, Kate, surpassed this accomplishment by reaching her 1000th dive, with over 900 of those dives also completed alongside the Bandos team.
The Dive Bandos team joined the couple in celebrating this memorable occasion, recognising not only their dedication to diving but also the enduring bond they have formed with the resort over the years.
Kate and Andy’s relationship with Bandos extends far beyond statistics. Having first visited the island in 2006, they have returned every year since, making Bandos an integral part of their lives. In 2014, the couple even chose to exchange their wedding vows underwater at the resort — a unique moment that forever linked their love story with Bandos.
“Celebrating guests like Kate and Andy reminds us of what Bandos truly represents,” said Ismail Rasheed, General Manager of Bandos Maldives.
For Bandos Maldives, moments such as these exemplify why guests continue to choose the island for both adventure and a sense of belonging. With stories like Kate and Andy’s, Bandos stands not merely as a dive destination, but as a home — both beneath and above the waves.
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Dive into inspiration: Alessia Zecchini at Sun Siyam Olhuveli

Sun Diving will host a special ocean experience with world champion freediver Alessia Zecchini on 13 October 2025. The event is scheduled to take place at Sunrise Beach, Sun Siyam Olhuveli, from 4:00 PM to 5:30 PM, offering guests the opportunity to meet the athlete widely recognised as ‘The Deepest Woman in the World.’
Born in Rome in 1992, Zecchini began freediving at the age of 13 and went on to set multiple world and European records. She was the first woman to reach a depth of 100 metres in free immersion and has since achieved 123 metres in constant weight with monofin. Her career has been celebrated internationally, including in the film Vertical Breath and the Netflix documentary The Deepest Breath. She continues to advance the sport while promoting awareness of ocean conservation.
The event at Olhuveli will feature an informative talk where Zecchini will reflect on her freediving journey, achievements, and the importance of protecting the marine environment. Guests will also have the chance to take part in a Q&A session with her and the Sun Diving team. In addition, Sun Diving will organise an interactive beach activity where participants can try scuba and snorkel gear in shallow waters under the guidance of instructors. Guests will also be able to capture photographs, collect autographs, and learn more about diving at the dedicated booth, which will highlight special offers from Sun Diving.
“Welcoming Alessia Zecchini is an honour for us and an inspiration for our guests,” said Ahmed Nihaan, Dive Centre Manager at Sun Siyam Olhuveli. “Her achievements beneath the waves embody both human potential and the importance of protecting our oceans.”
Sun Diving, the official diving division of Sun Siyam Group, provides SSI-certified courses, snorkelling, freediving, and specialty programmes across its Maldives properties. As a subsidiary, it enhances guest experiences with curated dive packages, illustrated dive maps, lifeguard training, and eco-focused initiatives, positioning Sun Siyam as a leader in sustainable marine-based activities.
Featured
Finolhu showcases Maldives’ only PADI Mermaid Instructor Trainer

Dive Butler International, in collaboration with Finolhu, a Seaside Collection Resort, is highlighting the achievements of Mara Restelli, recognised as the Maldives’ only certified PADI Mermaid Instructor Trainer.
With this rare qualification, Restelli offers a series of exclusive experiences designed to introduce guests of all ages to the art of mermaiding. The programmes range from playful introductory sessions to advanced courses and professional-level Instructor Development Courses (IDC).
“Mermaiding is more than a trend — it is a joyful way to connect with the water, express creativity, and feel empowered,” Restelli explained. “I enjoy watching guests discover confidence, freedom, and a sense of fun in the ocean. It is as much about transformation as it is about adventure.”
As part of Finolhu’s extensive marine offerings, the PADI Mermaid programmes provide an engaging complement to the resort’s diving and snorkelling activities. Participants may learn to glide gracefully underwater in a mermaid tail, capture striking images during professional photo sessions, or pursue advanced training that strengthens skills and deepens their connection with the ocean.
By hosting the Maldives’ only PADI Mermaid Instructor Development Course, Finolhu reinforces its reputation as a pioneering destination for distinctive and life-enriching marine experiences.
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