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Unraveling the mysteries of the Saba Bank

Nick and Caroline Robertson-Brown

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For the first time on the Saba Bank, an expedition team was able to successfully assess the shark diversity by attaching five satellite tags and confirming pregnancy stages by ultrasound of two species of sharks. This research advancement resulted in assessing 56 sharks, including 16 Tiger sharks with one confirmed early-stage pregnancy, and the first tagged male in the region. These details indicate that the Saba Bank’s important role in the shark populations of the North-Eastern and wider Caribbean Region have yet to be unlocked. This information is crucial to better protect sharks within the Dutch Caribbean’s Yarari Marine Mammal and Shark Sanctuary as well as beyond.

Dutch Caribbean Nature Alliance (DCNA) along with the Protected Area Management Organizations of the Dutch Caribbean: Saba Conservation Foundation (SCF), Nature Foundation St. Maarten (NFSXM), St. Eustatius National Parks (STENAPA), STINAPA Bonaire, the Aruba National Parks Foundation (FPNA), the Dutch Caribbean Nature Alliance (DCNA) and World Wildlife Fund for Nature- The Netherlands (WWF-NL) led a team on the Saba Bank in collaboration with Arizona State University, University of Groningen, Beneath the Waves and funded by the Biodiversity Fund of the World Wildlife Fund for Nature- The Netherlands (WWF-NL) .

This week-long ocean research expedition aimed to understand the stages of the reproductive cycle of tiger sharks on the Saba Bank. Tadzio Bervoets, Director of DCNA and expedition leader adds: “It is critical to collect the data necessary to advance the conservation actions for species of sharks in the Caribbean Region and with the data collected over the last week we have been able to get a clear picture of the important role the Saba Bank plays.”

This expedition built upon previous research and expertise from collaborating scientists.

Throughout the week, the team was able to deploy five satellite tags on the dorsal fin of tiger sharks which will allow tracking of the animals over an extended period of time. The ultrasounds which were taken using high technology imagery to determine the maturity and pregnancy stage supported by Brooke Anderson, Ph.D. candidate of Dr. James Sulikowski’s Lab, Arizona State University show that the Saba Bank is a reproductive area for IUCN Near Threatened listed species tiger and the IUCN endangered listed Caribbean Reef Shark. One of the female tiger sharks was confirmed with an early stage pregnancy and boasted a total length of 251cm. This multidisciplinary research approach is necessary for taking the first steps in understanding the reproductive life cycle for the species in the region.

One of the mysteries which resulted was the first tagged male on the Saba Bank sized at 306 cm and later named Maestro Angelo. While it is common to find females, it was surprising to encounter male tiger sharks during the research. Due to the lack of research done previously on these sharks on the Saba Bank, it became evident as to why there is a need to emphasize the importance and need for scientific research into these species.

Expeditions brought forward by the protected area management organizations, such as this one, support the necessary research needed for data-driven management solutions. These results will be used to help steer future research activities, inform local governments on the significant impact these species and their habitats have on ecotourism, and ultimately strengthen conservation policies. Ayumi Kuramae, Saba Bank Management Unit Officer shared the importance of this study:

“Through previous tagging expeditions it was clear that the tiger sharks tagged on the Saba Bank can travel as far south as Grenada, crossing many nations’ borders. This shows the importance of protecting the species not only in our waters, but region wide. Seeing male and female tiger sharks together of different life stages, shows us that protection of these species in our water is vital since we may be protecting the future generation of tiger sharks in the region. A decrease in the number of sharks can affect the overall fish stocks which leads to a disturbed natural balance in the sea. Saba, for example, highly depends on fisheries and dive tourism as part of the local economy which also relies on a healthy fish stocks. Thus, understanding the role of these apex predators is extremely important.”

After gazetting, the Yarari Marine Mammal and Shark Sanctuary will encompass the exclusive economic zone waters of the Saba Bank along with Saba, Bonaire and Statia. This sanctuary has the intention to provide a safe place for these animals, but without supportive data and knowledge, it is difficult to ensure they receive the appropriate protection measures. In order to survive, tiger sharks may use the Saba Bank as a key habitat for different stages of their life cycle but are known to travel to other regions during different life stages, making them a transboundary species. This expedition will help identify where larger, multi-national marine protected areas across the Caribbean should be to protect these species during their whole life cycle.

For more information about the work of the DCNA visit their website by clicking here

Images: Daniel Norwood

Nick and Caroline (Frogfish Photography) are a married couple of conservation driven underwater photo-journalists and authors. Both have honours degrees from Manchester University, in Environmental Biology and Biology respectively, with Nick being a Fellow of the Royal Photographic Society, a former high school science teacher with a DipEd in Teaching Studies. Caroline has an MSc in Animal Behaviour specializing in Caribbean Ecology. They are multiple award-winning photographers and along with 4 published books, feature regularly in the diving, wildlife and international press They are the Underwater Photography and Deputy Editors at Scubaverse and Dive Travel Adventures. Winners of the Caribbean Tourism Organization Photo-journalist of the Year for a feature on Shark Diving in The Bahamas, and they have been placed in every year they have entered. Nick and Caroline regularly use their free time to visit schools, both in the UK and on their travels, to discuss the important issues of marine conservation, sharks and plastic pollution. They are ambassadors for Sharks4Kids and founders of SeaStraw. They are Dive Ambassadors for The Islands of The Bahamas and they are supported by Mares, Paralenz, Nauticam and Olympus. To find out more visit www.frogfishphotography.com

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Curaçao Dive Site of the Month – Smokeys (Watch Video)

Bryan Horne

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New Video Release: Smokeys near Eastpoint Curaçao.

Learn about https://bit.ly/Smokeys-Dive-Site-Curacao – a Top 10 Dive Site in Curacao located near Eastpoint and arguably one of the best dive sites in the Caribbean. 

It rivals the finest dive sites in Belize, Bonaire and the Cayman Islands.

Video produced and edited for Dive Curacao, by NaturePicsFilms.

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Coral Spawning Predictions for Curacao and the Southern Caribbean

Bryan Horne

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The Caribbean Research and Management of Biodiversity (CARMABI) has released its 2022 annual coral spawning prediction calendar for Curacao and the south Caribbean.  This calendar plays a central role in studying the reproductive biology of Caribbean corals and guiding coral restoration efforts for the southern Dutch Caribbean islands.

Based on these predictions, researchers are able to harvest coral gametes that are reared to larvae that can be used to cultivate future coral colonies.

Coral spawning is a miraculous event where entire coral colonies, prompted by the lunar cycle, sunset time and water temperature, release gametes (eggs and sperm) simultaneously. Gametes of one species fertilize another to become fertilized embryos that settle on the ocean floor after days to weeks.

CLICK HERE FOR MORE DETAILS!

As divers, being able to witness a spawning event is a unique opportunity to enjoy the breathtaking scene as the entire reef becomes engulfed in a blizzard of future corals.

Each year, the Caribbean Research and Management of Biodiversity (CARMABI) releases a calendar to predict when each species of coral is expected to spawn. During these events, researchers from CARMABI, in collaboration with Reef Renewal Bonaire and Reef Renewal Curaçao, also collect gametes to be used to grow new corals in a laboratory setting.

Photo credit = CARMABI

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