This is an entirely personal choice of aid organisations based on information from Charity Navigator and personal knowledge of some of the organisations and their projects.
If you can't donate, perhaps you can work directly with village or regional organisations that work towards sustainable reef management. Many hands make light work.
You can of course do both!
"Greenpeace is the only global environmental charity that accepts no corporate or government donations so we can maintain a much needed independent voice, but it means we rely on individual supporters like you to fund our work. By making a much needed donation you will join Greenpeace in our work to protect our precious planet and find the solutions we need to our most important environmental issues. You are helping Greenpeace investigate, campaign, document and lobby for a sustainable balance between humans and the environment."
"From climate change to plastic pollution and over-fishing, the threats to our oceans are more urgent every day. Oceans sustain all life on earth. Now they need us to protect them."
"Sea Shepherd Conservation Society (SSCS) is an international non-profit, marine wildlife conservation organization.
Established in 1977, our mission is to end the destruction of habitat and slaughter of wildlife in the world’s oceans in order to conserve and protect ecosystems and species. We use innovative direct-action tactics to investigate, document, and take action when necessary to expose and confront illegal activities on the high seas. By safeguarding the biodiversity of our delicately balanced ocean ecosystems, Sea Shepherd works to ensure their survival for future generations."
rare states that "Human behavior is at the root of every major conservation and development challenge. Changing our behavior is the single most important thing we can do to ensure nature’s survival. Rare uses insights from behavioral science to motivate people and communities to adopt behaviors that benefit people and nature. We then work with partners to bring these solutions to scale. That’s what makes us Rare."
"Conservation International has pioneered transformational initiatives for climate stability, ocean conservation and planet-positive economies — from debt-for-nature swaps to funds for Indigenous peoples to novel carbon financing.
Conservation International is:
"Formed in 2011, the Manta Trust is a UK registered charity that co-ordinates global mobulid research and conservation efforts. Our team is comprised of a diverse group of researchers, scientists, conservationists, educators and media experts; working together to share and promote knowledge and expertise. Our mission is to conserve mobulid rays, their relatives, and their habitats, through a combination of research, education and collaboration."
Visit their website. There are many impressive success stories. Donate!
"Founded in 2002, SHARKPROJECT now counts as one of the largest and most influential organisations in the world. Team spirit, wide-ranging communication, never-ending ideas and a great deal of dedication. Our staff still all work on a voluntary basis. Rentals and other overheads are covered by our members, the result of which is that all donations flow directly into the projects without incurring any administrative costs. shark species." SharkProject does not advertise for donations, but they do explain how to donate on their websitedonate on their website.
The Tuna Research Tuna Research and Conservation Center is a collaboration between Stanford University's Hopkins Marine Station and The Monterey Bay Aquarium. The mission of the Tuna Research and Conservation Center (TRCC) is to advance the knowledge and understanding of tunas and other highly migratory marine fishes through research, education, and conservation.
"SOS Seaturtles was founded some 30 years ago by a small group of photographers, journalists and divers. It's aim from the very beginning has been to campaign for the sea turtle. We know how slowly the wheels turn at the political level, and for this reason we strive to inform the public directly of the sea turtle's struggle to survive in the hope that as many people as possible will voluntarily refrain from buying products made from this marine animals and supporting the various organizations protecting Sea turtles.
100% of the donations go directly to the projects."
The "Sea Turtle Foundation is a non-profit, non-government group based in Australia working to protect sea turtles through research, education and action. Turtles have seen the Earth undergo many changes over time and managed to survive them all. However, things are tough in the modern era when you are a slow breeding, long-lived reptile. Turtles face many threats from changes in climate, loss of nesting habitat, increased ocean pollution, and deliberate and accidental deaths caused by fishing activities around the world. These factors combined are pushing many of the world's populations of sea turtles toward extinction. Sea Turtle Foundation is working to address these threats through rescuing stranded turtles in North Queensland, training others to respond to strandings, providing educational programs for schools and communities and supporting research into turtle health and ecology throughout the Indo-Pacific region."
"Working with people around the world—from fishermen to government leaders, divers to scientists, Californians to Fijians—the Coral Reef Alliance - CORAL - unites communities to save coral reefs. We lead holistic conservation programs that improve coral reef health and resilience and are replicated across the globe."
The Global Coral Reef Alliance GCRA is "a small, non-profit organization dedicated to scientific research and sustainable management of the most valuable and threatened of all ecosystems—coral reefs. CRA is a coalition of volunteer scientists, divers, environmentalists and other individuals and organizations, committed to coral reef preservation. We primarily focus on coral reef restoration, marine diseases and other issues caused by global climate change, environmental stress and pollution. We work on hands-on direct-action projects around the globe to save and restore coral reefs by being the global leader in:
1) preserving the lost knowledge of reefs in the past, 2) correctly diagnosing the causes of the present destruction of reefs, and 3) developing cutting edge therapeutic methods that are our last chance to save coral reefs for future generations"