Beyond Jaws: Exploring Shark Science and Conservation

Speak Up For Blue
  • 4.5 (11)
  • Nature

Dr. David Ebert and Andrew Lewin interview shark scientists and conservationists to find out the steps they took that lead them to study and work with sharks. Interviews include stories of field shenanigans; career choices and advice; and, the science of sharks that may or may not include great white sharks...mostly not.

  1. 19h ago

    Walking Sharks and the Great Zebra vs. Leopard Shark Debate with Dr. Chris Dudgeon

    Dr. Chris Dudgeon has spent more than two decades studying some of the ocean's strangest and least understood sharks, from the reef-walking Hemiscyllium species of Papua New Guinea and Indonesia to the shape-shifting zebra shark that spends its youth striped and its adulthood spotted. In this episode, hosts Andrew Lewin and Dr. David Ebert sit down with Chris, a senior researcher who bridges evolutionary biology, population genetics, and applied conservation, to unpack why a single species can carry two completely different common names, how a newly discovered walking shark came to be named after her, and what it actually took to build a rewilding program from scratch. The conversation traces Chris's path from a landlocked childhood in Canberra to the front lines of Australian shark science, including her role as a founding member of the Oceania Chondrichthyan Society and her work describing new walking shark species alongside taxonomist Gerry Allen. She walks through the surprising biogeography of Papua New Guinea's walking sharks, where distinct species turn up within a short distance of each other with no obvious barrier explaining the split, and the practical realities of doing fieldwork where saltwater crocodiles share the water. The back half of the episode is devoted to the StAR Project, the rewilding effort that raises zebra shark pups from eggs supplied by aquariums around the world and releases them into the wild in Indonesia and Thailand, and to the taxonomic history behind why scientists now call the species Stegostoma tigrinum rather than Stegostoma fasciatum. Along the way, Chris shares a personal tribute to her late PhD supervisor, Janet Lanyon, reflects on what it means to build a research career with no roadmap to follow, and offers direct advice for the next generation of aspiring marine scientists. It is a wide-ranging look at how careful taxonomy, genetics, and community partnerships come together to protect species most people have never heard of, let alone seen. Takeaways Zebra sharks and leopard sharks are common names for the same Indo-Pacific species, Stegostoma tigrinum, which is striped as a juvenile and spotted as an adult; the confusion exists because a completely unrelated species, Triakis semifasciata, is also called a leopard shark in the eastern Pacific. A 2018 taxonomic review found that the species' correct scientific name should be Stegostoma tigrinum, not Stegostoma fasciatum, because an earlier valid name had been overlooked. Walking sharks (genus Hemiscyllium) use their pectoral and pelvic fins to "walk" across reef flats, mostly at night, and new species are still being described in Papua New Guinea and eastern Indonesia. A newly described walking shark species was named after Chris by her own PhD student, Jess Blakeway. The StAR Project (Stegostoma tigrinum Augmentation and Recovery) rewilds zebra sharks bred from aquarium-supplied eggs, with active hatchery and release programs in Raja Ampat, Indonesia and the Gulf of Thailand. Chris was a founding member of the Oceania Chondrichthyan Society in the mid-2000s, part of a small cohort of students who built the region's shark research community largely from scratch. Chris's advice for aspiring marine scientists: pick an understudied species to build genuine expertise faster, expect the path to feel anything but linear, and be prepared to figure things out without a roadmap. Connect with us: Website: https://bit.ly/37TMqeK Instagram: https://bit.ly/3eorwXZ YouTube: https://www.youtube.com/@beyondjawspodcast7591 Dave:  Website: https://www.lostsharkguy.com/ Instagram: https://bit.ly/3q1J9Q5 YouTube: https://www.youtube.com/@lostsharkguy Andrew: Website: https://www.speakupforblue.com/ Instagram: https://bit.ly/37g5WkG YouTube: https://www.youtube.com/@SpeakUpForBlueTV

  2. Aug 11

    Walking Sharks Explained: A PhD Candidate's Path to a New Species

    Walking sharks are one of the strangest small predators on the reef: pectoral fins built for crawling across coral flats at low tide, distributions so narrow some species live in a single bay, and a family tree that's still being filled in. In this episode, Andrew Lewin and Dr. David Ebert are joined by Jess Blakeway, a PhD candidate at the University of the Sunshine Coast, whose research on the distribution, ecology, and biology of walking sharks (genus Hemiscyllium) in Papua New Guinea has already led to a new species discovery. Jess walks through her path from volunteering with sea turtles in PNG to noticing a walking shark outside its known range, emailing shark scientist Christine Dudgeon out of the blue, and eventually joining her as a PhD student. That relationship led to the description of Hemiscyllium dudgeonae, or Dudgeon's walking shark, named in honor of her supervisor. Jess and the hosts also dig into why these sharks have such tiny, non-overlapping ranges, how researchers tell nearly identical-looking species apart using color pattern, genetics, and geography, and the ongoing mix-up between "zebra sharks" and "leopard sharks," which turn out to be the same animal at different life stages. It's a fun, detail-rich conversation about what it actually looks like to find a new species in the field, what happens after that moment (specimen collection, museum deposits, taxonomic description), and what Jess has planned for her postdoc research. Takeaways: Papua New Guinea and northern Australia are home to all 10 known species of walking shark, each with a highly restricted range shaped by deep-water barriers, freshwater outflows, and shallow-water habitat limits. Jess Blakeway co-described Hemiscyllium dudgeonae, a newly recognized walking shark species named after her supervisor Christine Dudgeon. Because walking sharks look nearly identical morphologically, researchers rely on color pattern, genetics, and geography, not body shape, to tell species apart. Zebra sharks and leopard sharks are the same species (Stegostoma tigrinum): striped as juveniles, spotted as adults. Some walking shark distributions overlap without the species actually co-occurring, raising open questions about how isolation and reef geography shaped their evolution. Connect with us: Website: https://bit.ly/37TMqeK Instagram: https://bit.ly/3eorwXZ YouTube: https://www.youtube.com/@beyondjawspodcast7591 Dave:  Website: https://www.lostsharkguy.com/ Instagram: https://bit.ly/3q1J9Q5 YouTube: https://www.youtube.com/@lostsharkguy Andrew: Website: https://www.speakupforblue.com/ Instagram: https://bit.ly/37g5WkG YouTube: https://www.youtube.com/@SpeakUpForBlueTV

  3. Jul 27

    Inside Shark Week 2026: Jesse Colaizzi on Alien Sharks Untamed America

    It's Shark Week season again, and Andrew Lewin and Dr. David Ebert are joined for the third year running by Jesse Colaizzi, an award-winning television documentary producer, senior editor, and director of photography who works closely with Forrest Galante. Jesse pulls back the curtain on how a Shark Week episode actually comes together, from scouting locations to the final cut. Jesse joins the show remotely from Gujarat, India, where he is showrunning and editing Vantara's Sanctuary Stories, before turning to his newest project, Alien Sharks: Untamed America, premiering Wednesday, July 29th on Discovery. Built around America's 250th anniversary, the episode traces a journey across the country in search of cryptic and lesser known sharks, including white sharks off Diablo Canyon, a California horn shark, a swell shark located after months of searching, a guitar fish, bonnethead sharks, a swarm of blacktip sharks, a rediscovered tagged sawfish with researcher Dean Grubbs, and a basking shark in Cape Cod Harbor. Along the way, Jesse and the hosts dig into what editors notice that scientists and viewers often miss: coordinated hunting behavior in sharks, how white sharks react to a drone's shadow on the water, the technical tricks used to slow down fast-moving animals on camera, and how years of watching raw footage trained Jesse to read animal behavior the way a birder reads bird behavior. Jesse also shares stories from filming rescued and rehabilitated animals in India, the discipline it takes to run multiple shows at once, and why this year's episode leans into American wildlife, from bison to elk to the Statue of Liberty, rather than the usual landmarks. Key Takeaways Jesse Colaizzi is an award-winning producer, senior editor, and director of photography who works with Forrest Galante on Shark Week and Discovery Channel programming, including Extinct or Alive and Alien Sharks. Alien Sharks: Untamed America premieres Wednesday, July 29th and is built around an America 250 theme, spotlighting cryptic and lesser-known native sharks across the country. The team tracked white sharks, a California horn shark, leopard sharks, a swell shark, a guitar fish, bonnethead sharks, blacktip sharks, a sawfish tagged in partnership with researcher Dean Grubbs, and a basking shark in Cape Cod Harbor. Editors and camera crews rely on subtle behavioral cues, frame rate tricks, and instinct to capture usable footage of fast-moving, unpredictable animals in the wild. White sharks have been observed reacting to the shadow of a filming drone, a small but telling example of how visual and behavioral cues shape what ends up on screen. Sharks display coordinated group behavior when hunting, echoing patterns Dr. David Ebert has documented in his own research on pack hunting. Jesse is currently based in Gujarat, India, working on Vantara's Sanctuary Stories, a series focused on rescued and rehabilitated animals and the conditioning process used to care for them. This year's episode centers the Statue of Liberty and iconic American wildlife such as bison and elk instead of typical landmark imagery, offering a nature-first take on the America 250 theme. Connect with us: Website: https://bit.ly/37TMqeK Instagram: https://bit.ly/3eorwXZ YouTube: https://www.youtube.com/@beyondjawspodcast7591 Dave:  Website: https://www.lostsharkguy.com/ Instagram: https://bit.ly/3q1J9Q5 YouTube: https://www.youtube.com/@lostsharkguy Andrew: Website: https://www.speakupforblue.com/ Instagram: https://bit.ly/37g5WkG YouTube: https://www.youtube.com/@SpeakUpForBlueTV

  4. Jul 14

    She Spent Years Tracking Sharks in Crocodile-Infested Rivers

    Dr. Julia Constance is back on Beyond Jaws, and this time she's joining hosts Andrew Lewin and Dr. David Ebert as Dr. Constance. Julia returns fresh off completing her PhD on the natural mortality and movement ecology of two of the world's least understood sharks: the speartooth shark and the northern river shark, both found almost nowhere outside northern Australia and southern Papua New Guinea. Using a long-running acoustic telemetry dataset built by her supervisor since 2013, Julia tracked around 200 tagged sharks across Northern Territory river systems, some for up to a decade, to understand how these animals move, where they go, and what puts them at risk. The conversation digs into just how little is still known about these sharks once they leave the rivers as adults. Julia explains how individuals vanish from the tracking data for years at a time before reappearing at a river mouth, with almost no confirmed sightings of adults in the open marine environment. She and the hosts also compare the relatively stable status of Australia's river sharks to their close relative, the Ganges shark, a species so rare and poorly documented that even basic facts about its biology are borrowed from research on its Australian cousins. Along the way, Julia and Andrew share what it's actually like to do this fieldwork: murky, chocolate colored water, gear retrieval by feel instead of by sight, and working in rivers that hold the largest population of saltwater crocodiles on the planet. The episode also touches on a real and growing concern: proposed water resource development on the Adelaide River, home to the largest known population of speartooth sharks anywhere in the world, and what that could mean for a species already living in an extremely narrow habitat. Connect with us: Website: https://bit.ly/37TMqeK Instagram: https://bit.ly/3eorwXZ YouTube: https://www.youtube.com/@beyondjawspodcast7591 Dave:  Website: https://www.lostsharkguy.com/ Instagram: https://bit.ly/3q1J9Q5 YouTube: https://www.youtube.com/@lostsharkguy Andrew: Website: https://www.speakupforblue.com/ Instagram: https://bit.ly/37g5WkG YouTube: https://www.youtube.com/@SpeakUpForBlueTV

  5. Jul 6

    What Does a Camera Have to Do With Saving Sharks?

    For decades, stunning shark photographs have shaped the way millions of people think about these misunderstood predators. But behind every unforgettable image is a story that rarely gets told. In this episode of Beyond Jaws, we sit down with Manique Fallows to explore the passion, patience, and purpose behind a life dedicated to sharks. Monique shares how photography became more than a way to capture wildlife. It became a powerful tool for conservation, storytelling, and helping people connect with animals they often fear. We also talk about her work as an author, her experiences in the field, and what it is like building a life around some of the ocean's most iconic species. Whether you love sharks, wildlife photography, or inspiring stories from people making a difference for the ocean, this conversation offers a fresh perspective. You'll come away with a deeper appreciation for the people behind the lens and why their work matters now more than ever. Website: https://saltyseadogbooks.com/ Connect with us: Website: https://bit.ly/37TMqeK Instagram: https://bit.ly/3eorwXZ YouTube: https://www.youtube.com/@beyondjawspodcast7591 Dave:  Website: https://www.lostsharkguy.com/ Instagram: https://bit.ly/3q1J9Q5 YouTube: https://www.youtube.com/@lostsharkguy Andrew: Website: https://www.speakupforblue.com/ Instagram: https://bit.ly/37g5WkG YouTube: https://www.youtube.com/@SpeakUpForBlueTV

  6. Jun 15

    What a 5-Week Shark Trip Revealed About the Future of Shark Science and Conservation

    Dave Ebert returns from a five-week journey across South Africa, Sri Lanka, and the Maldives, sharing stories from shark research, Sharks International, mentoring young scientists, and the search for lost sharks. This episode explores why taxonomy still matters, how new shark and ray species are still being discovered, and why the future of shark science depends on training the next generation. Shark science, shark conservation, Beyond Jaws, Dave Ebert, lost sharks, new shark species, guitarfish, South Africa sharks, Sri Lanka sharks, Sharks International, marine biology, ocean science, shark research, taxonomy, chondrichthyans, marine conservation, Save Our Seas Foundation, Maldives diving, science communication. Connect with us: Website: https://bit.ly/37TMqeK Instagram: https://bit.ly/3eorwXZ YouTube: https://www.youtube.com/@beyondjawspodcast7591 Dave:  Website: https://www.lostsharkguy.com/ Instagram: https://bit.ly/3q1J9Q5 YouTube: https://www.youtube.com/@lostsharkguy Andrew: Website: https://www.speakupforblue.com/ Instagram: https://bit.ly/37g5WkG YouTube: https://www.youtube.com/@SpeakUpForBlueTV

  7. Jun 1

    How Do You Build an Ocean Career When You Live Inland?

    Ocean careers rarely follow a straight line. In this episode of How to Protect the Ocean, Dave Ebert takes over the host chair to interview Andrew Lewin about his career journey, from marine biology and consulting to podcasting, science communication, and his new role as Ocean Communications Manager with Pisces Ocean. Andrew shares how choosing family, living away from the coast, and building a podcast over many years helped shape a different kind of ocean career. The episode explores why storytelling matters in marine conservation, how podcasting can build real professional networks, and why science communication is becoming a powerful tool for ocean impact. This episode is for anyone trying to build a career in marine science, ocean conservation, science communication, or environmental storytelling, especially if your path does not look traditional. Connect with us: Website: https://bit.ly/37TMqeK Instagram: https://bit.ly/3eorwXZ YouTube: https://www.youtube.com/@beyondjawspodcast7591 Dave:  Website: https://www.lostsharkguy.com/ Instagram: https://bit.ly/3q1J9Q5 YouTube: https://www.youtube.com/@lostsharkguy Andrew: Website: https://www.speakupforblue.com/ Instagram: https://bit.ly/37g5WkG YouTube: https://www.youtube.com/@SpeakUpForBlueTV

  8. May 25

    Are Orcas Really to Blame for the Missing Great Whites?

    Great white sharks have disappeared from some of South Africa's most famous shark hotspots, but the reason may not be as simple as the popular story suggests. In this episode, Chris Fallows returns to talk about orcas, white sharks, shark nets, longline fisheries, and the uncomfortable possibility that humans played a much larger role than many people want to admit. This conversation looks beyond the headline of orcas hunting great whites and asks a harder question: what happens when we focus on the predator we cannot control while ignoring the human systems we can? From False Bay to Gansbaai to the broader South African coastline, this episode explores how shark conservation, fisheries, tourism, photography, and public storytelling collide when an iconic predator starts to vanish. Connect with us: Website: https://bit.ly/37TMqeK Instagram: https://bit.ly/3eorwXZ YouTube: https://www.youtube.com/@beyondjawspodcast7591 Dave:  Website: https://www.lostsharkguy.com/ Instagram: https://bit.ly/3q1J9Q5 YouTube: https://www.youtube.com/@lostsharkguy Andrew: Website: https://www.speakupforblue.com/ Instagram: https://bit.ly/37g5WkG YouTube: https://www.youtube.com/@SpeakUpForBlueTV

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Dr. David Ebert and Andrew Lewin interview shark scientists and conservationists to find out the steps they took that lead them to study and work with sharks. Interviews include stories of field shenanigans; career choices and advice; and, the science of sharks that may or may not include great white sharks...mostly not.

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