Great White Shark Populations Have Interesting DNA

Great white shark DNA is one of the most puzzling mysteries in marine biology. Recent research has revealed that despite being one species, great whites have split into three distinct genetic groups across the globe. What’s even stranger: their nuclear DNA and mitochondrial DNA tell conflicting stories, leaving scientists scratching their heads. Shark philopatry—the tendency of females to return to their birthplace to give birth—adds another layer to this mystery. While philopatry has been well documented in species like lemon sharks and blacktip sharks, great whites show patterns that don’t neatly fit the rules. This episode unpacks how philopatry and DNA research intersect, why sharks defy easy explanations, and how these puzzles matter for conservation. Shark conservation depends on solving these mysteries. If different populations are genetically distinct, protecting one region isn’t enough. By understanding how sharks move, breed, and adapt, we can build stronger policies, create better marine protected areas, and ensure these apex predators survive in a rapidly changing ocean. Link to article: https://www.sciencealert.com/the-dna-of-great-white-sharks-defies-explanation-heres-why?utm_source=chatgpt.com Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube      

Advocacy for scientists is a skill that can transform how research impacts the real world. In this episode of How to Protect the Ocean, host Andrew Lewin reflects on an article by Melissa Varga from the Union of Concerned Scientists that encourages scientists to step into advocacy roles. Andrew shares why many researchers hesitate to speak out, the cultural challenges within academia, and how advocacy can be integrated into a science career without sacrificing credibility. Ocean conservation also depends on people outside the scientific community. Andrew emphasizes that anyone, scientist or not, can play a role in advocating for the ocean. From joining local campaigns to supporting policy initiatives, small steps build a movement that strengthens the voice for conservation. This episode highlights how advocacy can feel intimidating at first but ultimately becomes a natural extension of caring for the ocean. Website:  https://blog.ucs.org/melissa-varga/new-to-advocacy-3-tips-for-early-career-scientists/   Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube    

Sustainable fashion is more than a trend, it is a movement that connects what we wear to the health of our planet. In this episode, Andrew Lewin speaks with Courtney Barriger, CEO of Holding Court Inc., about how clothing design can reduce waste, prevent microplastic pollution, and empower people to make responsible choices. The discussion reveals the hidden costs of fast fashion, from synthetic fibers shedding microplastics into waterways to the massive environmental toll of textile waste. Ocean protection is at the heart of this conversation. Courtney shares her journey of creating stylish, environmentally conscious fashion that looks good while doing good. She explains why rethinking our clothing habits can help reduce plastic pollution and highlights innovative solutions in textile production. If you’ve ever wondered whether your wardrobe impacts the ocean, this episode will show you how fashion choices can truly protect marine life. Website: https://holdingcourtinc.com/ Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube    

Terracycle is proving that almost anything can be recycled, from cigarette butts to ocean plastics, transforming how the world thinks about waste. In this episode of How to Protect the Ocean, Andrew Lewin speaks with Tom Szaky, the founder and CEO of TerraCycle, to explore how his company is creating global recycling programs that redefine sustainability and consumer responsibility. TerraCycle has become a leader in connecting corporations and individuals to solutions that keep waste out of landfills and oceans. This conversation dives into the economics of recycling, why certain materials are left behind, how microplastics can be repurposed, and what it takes to shift both corporate and consumer behavior. By the end, you’ll see why recycling is not just about sorting bins but about reimagining the value of our waste. Terracycle Website: https://www.terracycle.com/ Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube  

Shark Meat Fed To Students in Brazil’s public institutions has sparked outrage after Mongabay uncovered thousands of tons of mislabeled shark meat, including endangered species like angelsharks, being served in schools, hospitals, prisons, and elderly care centers. Labeled as “cação” or “angel fish,” these meals were consumed by thousands of unsuspecting Brazilians, raising urgent concerns for both public health and ocean conservation. Shark meat in Brazil carries dangerous risks due to high levels of mercury and arsenic that accumulate in these apex predators. Scientists warn that children and vulnerable populations are especially at risk, while conservationists highlight the devastating impact on shark populations that have already declined 71% in open oceans. Lawmakers are calling for hearings, industries are pushing back, and the global conservation community is debating how to respond. This episode investigates how a school lunch scandal reveals the larger crisis of food security, seafood mislabeling, and biodiversity loss. Mongabay articles: https://news.mongabay.com/short-article/2025/08/brazil-serves-potentially-contaminated-shark-meat-to-children-in-public-schools/ https://news.mongabay.com/custom-story/2025/08/revealed-brazilian-state-buys-endangered-angelsharks-for-school-lunches/ https://news.mongabay.com/short-article/2025/08/brazils-shark-meat-problem/ https://news.mongabay.com/short-article/2025/08/brazil-cities-order-endangered-angelshark-meat-despite-fishing-ban/ https://news.mongabay.com/short-article/2025/08/brazil-cities-vow-to-stop-buying-threatened-shark-meat-after-mongabay-probe/ https://news.mongabay.com/2025/08/mongabay-shark-meat-expose-sparks-call-for-hearing-and-industry-debate/   Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube    

Oceana, working to protect endangered species, is at the heart of this powerful episode featuring Tara Brock, an environmental lawyer advocating for ocean life. Tara unpacks how the Endangered Species Act is used to protect humpback whales and sea turtles, and how legal tools like this remain essential to ocean conservation. As threats like ship strikes, climate change, and bycatch continue to rise, Tara explains why this legislation is still one of the strongest protections we have—and how it’s enforced. Throughout the episode, we explore Oceana’s litigation strategies, real-world wins in protecting marine life, and the ways the law intersects with fisheries, policy, and public engagement. Tara’s stories and insights offer a clear call to action: the ocean needs legal defenders, and everyone has a role to play in protecting it. If you care about protecting species on the brink, this conversation will inform and inspire you. Oceana's Website: https://usa.oceana.org/ Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube    

Starting an environmental nonprofit often begins with a vision and the determination to make a difference, but it also comes with challenges in funding, community support, and long-term sustainability. In this episode of How to Protect the Ocean, Bart Oor and Sander Brienen share the story of how they created Balean, a platform designed to help independent projects and nonprofits access the support they need to thrive. Independent changemakers are reshaping how conservation work is done. Bart and Sander explain the obstacles they faced, how collaboration shaped their journey, and why Balean is launching in October as a dedicated space to fund and grow independent ocean initiatives. If you’re passionate about starting your own project or nonprofit, this conversation provides both inspiration and practical advice. Website: https://www.balean.org/ Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube    

Pacific Islands Heritage Marine National Monument: For over a decade, these waters stood as one of the largest no-take zones on Earth, safeguarding corals, fish, and migratory species. But on day one of his presidency, Donald Trump erased the U.S. commitment to 30x30 and soon after issued Proclamation 10918, opening parts of the monument to commercial fishing. Marine conservation at risk: The rollback sparked lawsuits and reignited the debate over whether U.S. marine protections are too vulnerable to political swings. Just two weeks ago, a court overturned Trump’s proclamation on a technicality, reclosing the area to fishing. In this episode, we break down what happened, what’s at stake, and how the U.S. can rebuild trust in its marine conservation commitments. The future of 30x30: We explore the tension between conservation science, fishing industry pressure, and fragile presidential protections. The conversation highlights why codifying protections into law may be the only way forward to safeguard biodiversity hotspots like Wake, Johnston, and Jarvis. Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube    

Less than 400 left — that’s how many North Atlantic right whales remain in the world. These critically endangered whales are at the center of an urgent conservation story, but how the media communicates about them plays a powerful role in shaping public awareness and action. In this episode of How to Protect the Ocean, Andrew Lewin sits down with Dr. Marcus Reamer, a new PhD graduate in science communication, to explore how newspapers and digital outlets covered right whale crises over the past decade. Science communication emerges as a critical conservation tool, with Dr. Reamer sharing insights from his research on major publications like the New York Times, Washington Post, and LA Times. Together, they unpack why media coverage spikes during crises but fades when attention shifts elsewhere, and what this means for endangered species storytelling. Whale conservation depends not only on data and science but also on the narratives shared with the public. This conversation highlights how media framing can help or hinder conservation literacy, and how improved communication can increase support for saving one of the world’s rarest whales. Link to article: https://iopscience.iop.org/article/10.1088/2515-7620/adeeec Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube    

Managing fishing vessels goes far beyond tracking where a boat is registered. In this episode, we dive into Oceana’s Beyond the Flag report to explore how large-scale fishing vessels are often flagged in one country but owned in another, creating dangerous loopholes that allow illegal, unreported, and unregulated (IUU) fishing to thrive. This legal and beneficial ownership opacity undermines ocean governance, drains resources from coastal nations, and hides the true power behind global fishing operations. Managing fishing vessels transparently is essential for sustainable ocean futures. We discuss why more than 6,900 industrial vessels are shrouded in secrecy, how open registries like Panama and Belize fuel the problem, and what can be done to hold owners accountable. With solutions ranging from public vessel ownership databases to policy reform, this episode highlights how better transparency could transform fisheries management worldwide. Join the Undertow: https://www.speakupforblue.com/jointheundertow Connect with Speak Up For Blue Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube