Marine Life & Conservation Blogs
Creature Feature: Oceanic Whitetip Shark
In this series, the Shark Trust will be sharing amazing facts about different species of sharks and what you can do to help protect them.
This month, it’s the turn of a legendary shark – the Oceanic Whitetip. Known for their incredibly long dorsal and pectoral fins, this species was once the most abundant oceanic-pelagic species of shark on the planet.
The Oceanic Whitetip is a species of shark in the same family (Carcharhinidae) as the Blacktip, Bull and Spinner Sharks, amongst others. Sharks in this family are also known as “requiem” sharks. “Requiem” is said to derive from the ancient Norman French word “reschignier” – to bare teeth or grimace.
Stocky and large, they are grey or brown above, and white below. Oceanic Whitetips are famous for their huge rounded first dorsal fin and paddle-like pectoral fins. Their fins have distinctive mottled white tips. They are slow moving, and active at day and night. Their huge pectoral fins spread out as they cruise at the surface.
They typically feed on oceanic bony fishes and cephalopods. However, they also eat stingrays, sea turtles, birds and crustaceans. They feed by biting into schools of fish or by swimming through schools with their mouth open. When feeding with other species, like Silky sharks, Whitetips can be aggressive. Peter Benchley, author of Jaws observed Whitetip sharks eating the faeces of Pilot Whales!
Like all sharks in the Charcharhinidae family, Oceanic Whitetips are viviparous. Embryos develop in utero and are fed by a placental sac. Mating season is in early summer for those in the Atlantic Ocean and southwest Indian ocean. Females in the Pacific have been found with embryos year round – suggesting a longer mating season. The gestation period is one year. Sexual maturity is reached at 4-9 years depending on location.
Whilst they are mostly solitary, Oceanic Whitetips do occasionally hunt in groups. These organised group hunts, during which Whitetips cooperate in hunts and strategically take turns in attacking prey.
Whitetips are incredibly inquisitive. Unfortunately, this means they are easy to catch. Combined with their low reproductive rate, they are incredibly at risk from population depletion. Previously listed as vulnerable, the Oceanic Whitetip was reclassified to critically endangered in 2019. Populations are declining across the globe, with declines of up to 99% reported in in the northwest and central Atlantic, for example.
Conservation efforts to help the species bounce back include listing on CITES Appendix II and CMS Appendix I, for example. They also have protection under some RFMOs (Regional Fisheries Management Organisations). However, these listings do not mean that Oceanic Whitetips are not still targeted or caught as bycatch in some parts of the world. With populations declining at such a high rate, further protections need to be implemented to ensure that the species can recover.
SCIENTIFIC NAME: Carcharhinus longimanus
FAMILY: Carcharhinidae
MAXIMUM SIZE: ~380cm long
DIET: Oceanic boy fishes and cephalopods. But also on stingrays, sea birds, turtles, marine gastropods, crustaceans, marine mammal carrion and garbage.
DISTRIBUTION: Worldwide – formerly the most abundant warm-water oceanic-pelagic shark.
HABITAT: Oceanic (occasionally coastal). Far off-shore, from surface to depths of 1082m. Temperatures between 18-28°c.
CONSERVATION STATUS: Critically endangered.
For more amazing facts about sharks and what you can do to help the Shark Trust protect them visit the Shark Trust website by clicking here.
Blogs
Saba’s Plan for a Coral Comeback
Saba has an exciting new initiative to restore its coral reefs. This new project, running from 2024 to 2026, will focus on reviving key species in the island’s underwater ecosystems. With a collaborative team from the Saba Conservation Foundation (SCF) and Van Hall Larenstein (VHL) University of Applied Sciences, the project aims to restore both corals as well as sea urchins.
This initiative is centered around coral restoration, specifically reviving two essential coral species—staghorn coral (Acropora cervicornis) and elkhorn coral (Acropora palmata). By mapping parent colonies and using a technique known as coral gardening, SCF will create and maintain coral nurseries. These corals will eventually be outplanted at key reef sites around Saba to not only expand the number of coral colonies, but also provide essential fish habitat. The project focusses on installing coral nurseries, training staff with the newest techniques and starting with the restoration of key reef sites.
Reef Cleaners to the Rescue
It’s not just corals getting a makeover—this project also shines a spotlight on the essential role of grazers, particularly sea urchins. VHL is leading the charge on cultivating and restocking two key sea urchin species, West Indian sea egg (Tripneustes) and long-spined sea urchin (Diadema), known for their ability to keep algae in check. By removing algae, which are important competitors of corals, they help the coral to thrive. By restoring these “reef cleaners,” Saba’s project will give corals the breathing room they need to grow, setting the stage for a healthier, more balanced marine ecosystem.
From Tiny Urchins to Big Goals
The project will be funded as part of the Dutch Government’s Nature and Environment Policy Plan (NEPP) 2020-2030 for the Caribbean Netherlands, a comprehensive initiative aimed at conserving and restoring the unique natural environments of the Dutch Caribbean islands, including Saba, St. Eustatius, and Bonaire. This project is aiming for big milestones: build and maintaining coral nurseries, the expansion of urchin cultivation facilities, and the creation of a dedicated research center. By 2026, the project hopes to ramp up coral and grazer restoration, with the ultimate goal of extending these efforts across the Dutch Caribbean. By linking local initiatives to broader regional goals, Saba’s restoration project promises to leave a lasting impact on both the environment and the community.
Find out more about the DCNA at dcnanature.org.
Blogs
Reef-World marks two decades of marine conservation: strengthening impact amid coral reef threats
Empowering ocean stakeholders to tackle future challenges and ensure the survival of coral reefs and humanity
2024 marks the 20th Anniversary of The Reef-World Foundation’s tireless efforts for global coral reef conservation. The UK charity is the international coordinator of the UN Environment Programme’s Green Fins initiative, known as the leading voice in sustainable marine tourism. Today, Reef-World released its 2023-2024 Impact Report outlining a year of substantive growth and impact in its marine conservation programmes.
Impact Report Highlights:
- Impressive improvements in environmental behaviours to protect coral reefs by the marine tourism industry as the global participation of Green Fins increases.
- Continued capacity building for government and NGO staff to effectively manage marine tourism activities in Asia, Caribbean and Red Sea regions.
- For the first time in Green Fins’ 20-year history, tourism operators have achieved ‘Best Environmental Performer’ status by demonstrating the lowest possible environmental impact in their environmental assessments. In 2024, three dive operators achieved this challenging milestone.
- Significant increases in global participation of Reef-World’s innovative digital conservation tools.
- 138 Green Fins dive operator members achieved the strict threshold for PADI Eco Center recognition.
- Developed four new educational materials and translated two into 16 languages to support the marine tourism industry in achieving sustainability targets.
- Establishing a new Reef-World Development strategy and recruiting new roles – Development and Programmes Managers.
- Reef-World’s board welcomes new Chair and Trustees strengthening organisational leadership.
Reef-World started as a one-person mission to inspire and empower communities to act in conserving and sustainably developing coral reefs and related ecosystems. Today, the team of 12 continues to meet this mission by inspiring and empowering the global marine tourism community to be exemplary sustainability leaders by using the Green Fins guidelines and tools to simultaneously use and protect the world’s precious reefs.
In April 2024, the fourth global coral reef bleaching event was confirmed. Reef-World’s work has never been more urgent as the marine environment, and the benefits they provide humanity, continue to be eroded by global threats. The reduction of local threats, like those from the marine tourism industry, is an essential step to ensuring a future where coral reefs survive and continue to support the millions of people who depend on their ecosystem benefits. Reef-World’s work buys time for coral reefs and related ecosystems to be resilient to the impacts of global threats.
“Right now our corals are facing the greatest fight of their existence as the terrifying predictions of the steps towards their complete extinction are starting to come true. But all is not lost, reefs are resilient and they have existed on this planet for millions of years. We must take action now, to buy time for reefs by reducing threats facing them and allowing them to react and adjust to the changing environment they need to survive in.” – Chloe Harvey, Executive Director
Looking Forwards:
Like coral reefs, the Reef-World team needs to be resilient in the face of the complex challenges of the conservation sector. Reef-World has invested significantly in developing a Culture of Care to ensure the well-being of its team on a daily basis, continuing to be an exemplary employer to enable its team to best achieve the mission for coral reef conservation.
With the foundations of a Culture of Care and organisational development laid, Reef-World is emerging from the end of a natural organisation life cycle, that brings the challenges of growth and scale, stronger than ever. With a new strategy in place to generate much needed resources, Reef-World is excited for the opportunities to leap forward, continue to scale our impact and lean into new innovations and untapped opportunities for marine conservation.
We continually strive to become a forward-thinking organisation that delivers on our goals and commitments to our stakeholders with fresh approaches and not being afraid of steering away from a “normal approach.” This approach is not only applied to our programmes of work but also internally and carries over to our Culture of Care for our team.” — JJ Harvey, Operations Director
The Reef-World Foundation is immensely grateful for the continued support of its grant funders: UN Environment Programme, IUCN’s Blue Natural Capital Financing Facility, Adventure Travel Conservation Fund, PADI Aware Foundation, and World Nomads Footprints Program.
Reef-World would also like to express its gratitude to international partners whose vital support has resulted in significant tangible benefits for our work and mission: PADI; Professional SCUBA Schools International (PSS); Explorer Ventures; 1% for the Planet; ZuBlu; Snorkel Venture, GSTC; Dive O’Clock; Seven Dragons; DiveAssure and Eco Beach, without whom these achievements would not be possible.
The full 2023–2024 Annual Impact Report is available on Reef-World’s website.
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