World of Sharks

October is famously spooky season – but did you also know it’s the month that we celebrate one of the funkiest groups of elasmobranchs? October 17th is International Sawfish Day, an event held every year to raise awareness of these wonderfully weird and seriously threatened animals.

‘What is a sawfish?’ I hear you cry. Well, fear not – this is an episode dedicated entirely to learning all about them. And to teach us all about these fantastical and mysterious creatures, our guest is Dr Barbara Wueringer, a scientist specialising in the behaviour, sensory ecology and biology of sharks and rays...

Many of us enter the water hoping to encounter sharks and rays, and maybe even get some prize images of our own – but how can we do it with as little impact on the animal as possible? In this episode, we discuss how to share the water with sharks safely, ethically and responsibly with wildlife photographer and filmmaker Luke Saddler, who has spent countless hours observing sharks in their environment and capturing their natural behaviours. We talk about how to: read body language, choose a responsible tourism operator, start out in wildlife film-making and become a ‘fly-on-the-wall’ – all while hearing...

Ghofrane Labyedh came to Cameroon in search of whales and instead discovered an overlooked conservation story: threatened sharks and rays were being landed in large numbers, yet little was known about the fisheries catching them.

Since 2019, Ghofrane has worked alongside Cameroon’s coastal communities to understand these fisheries and the cultural, social and economic importance of sharks and rays. In this episode she shares stories of her work, which weaves together research, community-led conservation, policy and storytelling; culminating in an initiative where the fishers themselves play a central role in protecting the endangered species on their doorstep.

The international trade in shark fins is a behemoth; vast, complex and difficult to disentangle. But for molecular and forensics expert Dr Diego Cardeñosa, one of the most powerful tools we have to tackle the fin trade is the tiniest part of a shark: their DNA. In this episode, we take a deep dive into Diego's research, which has been instrumental in understanding the nuances of the fin trade and securing better regulations for this billion-dollar industry. This includes the development of a portable, easy-to-use and inexpensive DNA ID kit (the "lab-in-a-backpack") that can help local officials identify e...

Few sharks capture the imagination quite like the thresher shark. They are well-known for their cartoonish appearance, “anxious-looking” faces and seriously cool hunting technique. But in scientific terms, we know very little about them – despite their endangered status.
Rafid Shidqi is on a mission to change that. For the last eight years, he has led groundbreaking research on the elusive pelagic thresher sharks of Alor, Indonesia, whose preference for deep, pelagic habitats make them extremely difficult to study. In 2018, Rafid started the non-profit Thresher Shark Indonesia, working within remote, shark-dependent fishing communities to better understand and protect the specie...

This episode is an extra special one – it’s our 100th! To celebrate this milestone, our host Dr Isla Hodgson looks back across half a decade and 100+ hours of conversations about sharks with the people who know them best. And, we hear messages and bonus shark stories from some friends of the pod. 

Transcript and shownotes: www.saveourseas.com/worldofsharks/podcast.

This episode features the voices of (in order of appearance): 

Dr David Shiffman [5.10] 

Dr Helen Scales [5.51]

Dr Luz Saldana Ruiz (en Español) [13.46]

Jillian Morris-Brake [16.51]

Steve...

Parasites have a bad rep. We often see them as harmful, exploitative, and just plain icky. But in the shark world, parasites are much more than just irritating hitchhikers. They are ecosystem engineers and important indicators of the health of not just sharks, but the entire ocean. And studies are starting to show some may actually benefit our sharky friends.

Isla met with shark parasitologists Dr Bjoern Schaeffner and Dr Jaime Penadés Suay at Sharks International, Sri Lanka, where they were hosting a workshop on shark parasites. Together, they discuss what parasites we might find in a...

We're diving back into our mailbag to answer more of your burning sharky questions! In this episode we address all sorts of fascinating queries such as how bioluminescence evolved in sharks, which species are capable of breathing while they’re not swimming, and whether sharks are really older than trees. Plus, we take deep dives into several awesome species – great white sharks, grey reef sharks, pocket sharks and of course, James’ favourite, the velvet belly lantern shark. 

Specific question timestamps:

Q1: Are there any shark species that are showing signs of adapting well to climate change...

Art has the power to change perspectives, spark dialogue, and raise awareness of the complex issues facing our ocean. This is exactly why PangeaSeed was established. Since its inception in 2010, PangeaSeed has brought together local artists and their communities to collaborate on large-scale, vibrant public artworks on the walls of their towns and cities, depicting the ocean, her inhabitants, and the challenges she faces, in line with PangeaSeed's mission to bridge art and science. Over the last decade,  over 500 murals have been created in locations across the world. Ahead of their travels to Seychelles, Isla sat down with executive d...

In August 2025, a paper published in the journal Frontiers in Marine Science suggested that ocean acidification could negatively impact a shark's most useful tool: their teeth. We speak with the papers lead author, Max Baum, about this research, and what the findings could mean for the sharks of tomorrow. Plus we take a deep dive into the wonders of shark teeth, and meet a decidedly unbothered tiger shark named Farida.

You can read the paper we discuss in this episode here: Simulated Ocean Acidification Affects Shark Tooth Morphology 

You can also follow Max on Instagram (@max...

Sharks have been around a long, long time (over 450 million years!). But how did they evolve into the extraordinarily diverse and successful group of animals that we have today? On today's episode, we meet palaeontologist and author of The Secret History of Sharks, Professor John Long, to discuss a thrilling story of evolutionary experimentation, fossilised clues, and above all, survival.

The Secret History of Sharks is available now: https://www.quercusbooks.co.uk/titles/john-long-2/the-secret-history-of-sharks/9781529427356/

Shownotes: www.saveourseas.com/worldofsharks/podcast

The Maldives has served as a shark sanctuary for 15 years, and is now one of the most diverse regions for sharks and rays in the world. But with great success comes a new problem: conflict with humans. Fishers are reporting a loss of some of their catch to sharks, an issue known as depredation. For her PhD, SOSF project leader Mina Hatayama is seeking to understand depredation in the Maldives, studying shark behaviour and how it impacts local fishers and their attitudes towards sharks. She will also be asking the very intriguing question of whether hotter sharks are hungrier...

Sometimes called the 'couch potatoes of the sea', nurse sharks are famous for their laid back attitude to life spending most of their days cosied up in piles, napping. But their gentle, docile nature doesn't make them any less special. In this episode, we sit down with SOSF project leader and PhD Researcher Sergio Madrigal Mora - who has spent a lot of time hanging out with the Labradors of the shark world - to discuss how nurse sharks are perfectly adapted to life in the tropics and why they form 'cuddle huddles' on the sea floor. And, we...

We know sharks have incredible senses, but just how good is their eyesight? In this episode, we explore the world through a shark's eyes with fish vision expert Dr Lily Fogg. How does fish vision compare to our own? How do the eyes of a fish living on a vibrant coral reef differ from those hanging out in the murky depths? And do sharks see in technicolour, or multiple shades of grey?

We also take a dive deep into Lily's most recent research, which investigated the eyes of the world's longest living vertebrate: the greenland shark. Her...

To kick off our new season, we're diving into our mailbag to answer your burning questions! From speedy sharks to mimicry and even fossilised shark poop, we're leaving no stone unturned...

Thank you to everyone who sent in a question - we had so many we ended up doing two episodes! Part 2 will be out later in the season.

Questions answered (with timestamps):

The conversations that shape the fate of sharks and rays rarely happen in quiet laboratories or out at sea. More often, they unfold in fluorescent-lit halls, behind nameplates and microphones, inside sprawling congress centres where global decisions about nature are made. At the IUCN World Conservation Congress, surrounded by thousands of delegates debating the future of biodiversity, host Isla sat down with SOSF Scientific Advisor Sarah Fowler and Chair of the IUCN Shark Specialist Group, Dr Rima Jabado, to discuss how far we’ve come in the race to save sharks and rays from extinction – and what steps we need...

Did you know that there are over 60 species of shark who are luminous? In this episode, we learn all about the sharks who light up the darkness of the deep sea. How are they able to produce their own light? And why have they evolved the ability to glow? We are joined by Professor Jerome Mallefet, an expert in bioluminescence who has studied some of the most fantastical species on earth, including a shark with lightsabers on its back - the velvet belly lanternshark - and the largest known luminous vertebrate, the kitefin shark.  

Shownotes: www.saveourseas.com...

How do sharks locate prey when they’re roaming the open ocean? What does a shark ambush look like? Are sharks capable of hunting cooperatively? And why do cookiecutter sharks take on prey much larger than themselves (including submarines!)? We are asking all these questions and so much more this week as we dive into the fascinating world of shark behavioural ecology to better understand foraging and hunting, with marine biologist and co-lead of the Predator Ecology and Conservation Lab at Florida International University, Dr Yannis Papastamatiou.

Find out what it was like to dive with over 300 bl...

It’s spooky season, and what a great excuse to visit our friends in the dark; the deep-sea sharks, rays, skates and chimaeras! We’re joined by fisheries scientist and deep-sea legend Dr Brit Finucci to go on a journey into the darkness – a far from barren landscape filled with weird and wonderful creatures. We’ll meet icons like the small-but-ferocious prickly dogfish, the luminous lanternsharks, the ancient and toothy frilled sharks, and a ghost shark called Colin, who just so happens to be new to science.

Shownotes: www.saveourseas.com/worldofsharks/podcast 

If you want to l...

From a shovel to a mallet, and even an aeroplane - the hammerheads really do win the prize for some of the most bizarrely shaped sharks out there. But why do they have such oddly-shaped noggins? What do they eat? Where do we find them? And why are one of the most charismatic groups of sharks in the world also one of the most threatened? 

In this episode we are joined by Dr Kelly Kingon, Associate Professor at the University of the Bahamas, SOSF project leader and co-director of the non-profit CHaPO (Conserve Habitats and Protect Organisms). K...

Tagging hammerheads, tracking silky sharks and exploring a remote coral paradise in the middle of the Gulf of Mexico…This week, we’re diving into the fascinating world of shark trophic ecology with PhD researcher and SOSF project leader Brett Sweezey! Brett is investigating the interactions between predators and prey, and how they influence where sharks go amongst the unique habitats of the Flower Garden Banks National Marine Sanctuary. Join us as we discuss the innovative methods Brett is using, some fascinating early findings, and the challenges and triumphs of studying these incredible creatures in their natural habitat.

Yo...

A turtle that looks like a pig, and a shark that looks like a plane...in this episode, we're heading to the colourful, diverse lands of the Kikori River in Southern Papua New Guinea to meet researcher and director of the Piku Biodiversity Network (www.pikubionet.org.pg). In 2018, Yolarnie expanded the PBN - which originally focussed on the community-led conservation of the endangered pig-nosed turtle - to include the 45 species of shark and ray that can be found in the Kikori river system. These species include the unusual and understudied winghead shark, one of the few sharks that...

Dive into the deep, remote waters of New Zealand's Fiordland with us as we meet the mysterious broadnose sevengill shark and the scientist who is trying to study them: Dr Alice Rogers. Alice's research aims to discover how these ancient creatures are responding to climate change - will the fiords provide vital refuge for the species as our waters get warmer?Along the way, she and her team are uncovering uncovering the secrets of these elusive "grandpa" sharks.

Shownotes: www.saveourseas.com/worldofsharks/podcast

Follow Alice: @dralicerogers

Find out more: https://saveourseas.com/pr...

We're taking to the skies to find out what great white sharks get up to when no-one's looking...

From his drone’s vantage, Carlos Gauna — AKA The Malibu Artist — has captured previously unrecorded behaviours of one of the ocean’s most captivating predators, the great white shark. His footage has fascinated viewers from across the globe, challenged misconceptions of white sharks, and even altered Carlos’ own perspective of the species. In this episode we talk about some of these behaviours; from a shark apparently 'eating' kelp to their interactions with dolphins and people. And, we discuss the moment tha...

Tagging tiger sharks, seamount navigation, and a great white shark called Princess Sparkles...  This week, we're diving into the fascinating world of shark movement ecology with research scientist Dr Sammy Andrzejaczek to explore how and why sharks move about the oceans - in particular zooming in on their vertical space use and asking why some sharks take frequent dives to depths of over 1,000 metres. We also discuss the potential effects of the lunar cycle, and what white sharks are up to off the coast of central California. And, we take you behind the scenes as Sammy explains some of t...

In this episode of World of Sharks: In the Field, we are learning what it’s like to live and work on a tiny, remote island in the middle of the Indian Ocean, and study sharks and rays in what can be considered one of the most pristine marine environments on earth today. 

In part 1, we meet the team of the Save Our Seas Foundation D'Arros Research Centre (SOSF-DRC), explore the island and its vibrant underwater world, and swim with one of the largest aggregations of reef manta rays in Seychelles. 

Time stamps: 

02.30: Intro...

In part 2 of our 'In the Field' episode with the Save Our Seas Foundation D'Arros Research Centre, we are heading to the neighbouring atoll of St Joseph to tag juvenile sharks and take part in their long term mark-recapture study. We'll also be finding out more about the sharks of D'Arros, and heading out at night in search of bull, mako, silvertip and grey reef sharks...

Time stamps:

03.55: Why is D'Arros so important to sharks and rays?

07.15: Tagging juvenile sharks on St Joseph atoll

23.00: Camping overnight on the atoll and sea...

We're gonna need a bigger podcast...

In honour of the 50th anniversary of the release of Jaws - one of the most iconic shark movies of all time - we are bringing you a very special bonus episode wholly dedicated to the film. Host Isla is joined by two jawsome guests: shark scientist and science communicator Amani Webber-Schultz (@curly_biologist), and social scientist and Associate Professor in public policy, Dr Chris Pepin-Neff (@csyd2202). Together, they discuss the cultural impact of Jaws and its negative effects on public perceptions of sharks and shark conservation, as well as its pos...

They are the most iconic shark species of all time, known for their strength, hunting prowess, and long-distance travel. But there is a lot more to great white sharks than their reputation. They are not the mindless killers that the movies would have you believe – in fact, they are a highly curious and elusive species who continue to surprise us. And someone who knows white sharks inside out is Dr Alison Kock, a marine biologist who has spent the last 20 years studying their behaviour and ecology. In this episode, Dr Kock shares everything she knows about the world's largest pr...

This week on the World of Sharks podcast we are meeting Ana Lúcia Furtado Soares, founder of the Angola Elasmo Project - a grassroots initiative focussed on the research and conservation of sharks and rays along the Angolan coast – to discuss the joys and challenges of building a project from scratch, working with data-poor fisheries and the importance of empowering local voices.

Shownotes: www.saveourseas.com/worldofsharks/podcast 

You can follow the Angola Elasmo Project on Instagram (angola.elasmoproject) and find out more about the project here: 
https://saveourseas.com/project/documenting-shark-diversity-and-fisheries-
in-an...

The trade in shark liver oil is an invisible threat to sharks. Not only is there limited research on the topic, but liver oil is notoriously difficult to track and trace. Enter Dr Madeline Green, molecular fisheries ecologist and Principle Investigator of the Forensic Fisheries Lab at the University of Tasmania. Madi is working to apply protocols from the tracing of olive oil to extract DNA from shark liver oil samples, in order to identify species and help monitor this complex trade. In this episode, we learn all about Madi's research, and how the trade in liver oil...

Spiral intestines! Curly poop! A shark that eats plants! And…turning your stomach inside out because you ate something dodgy?! In this episode we explore the ins and outs of a shark’s digestive system with animal physiologist Dr Samantha Leigh (@sea_science_sam), an expert in all things shark gut. We learn how a shark’s digestive system is designed for maximum efficiency, the different ways in which they ingest their hugely diverse diets, and how some sharks are able to survive weeks – sometimes months – without a meal. We also take a deep dive into Dr Leigh’s research on...

Why swim when you can just walk from a to b?! This week, we are taking a closer look at the "walking" or epaulette sharks, a group of nine species who have evolved a slightly unusual way of getting around. We're joined by Faqih Akbar Alghozali, co-founder of Elasmobranch Project Indonesia (EPI) and SOSF project leader, who has lots of stories to share from his time in the field with the Kalabia, or Raja Ampat epaulette shark. Faqih and his team are trying to understand more about this poorly studied species, who are endemic to this remote paradise. 

Join us for a slightly different easter egg hunt, as we go in search of shark eggcases! From tiny catshark eggcases no bigger than your index finger, to a skate that lays eggs larger than your head and even an egg that looks (and functions) like a corkscrew - we explore them all with Cat Gordon, Senior Conservation Officer for The Shark Trust. And, we learn about one of the longest running citizen science projects for sharks, rays and skates: The Great Eggcase Hunt. 

You can find out more about The Great Eggcase Hunt and how you c...

In this episode, we are exploring the ‘sixth sense’ of sharks – electroreception! We are joined by sensory biologist and shark elasmobranch expert Dr Stephen Kajiura, Professor in the Department of Biological Sciences at Florida Atlantic University (FAU) to discuss how sharks are able to detect minute electrical signals and use this sense to pinpoint prey with mind-blowing accuracy. We also get deep into functional morphology, zooming in on the Ampullae of Lorenzini and the unique morphology of the hammerhead. And, we chat about how electroreception doubles up as a kind of internal shark sat nav, helping them to navigate entire...

How do sharks learn to be a shark? Do they really eat their siblings? Is there such a thing as a shark teenager? How do sharks find a mate? And what happens when they reach old age? In this episode, we answer all these questions and more as we embark on a true deep dive into the lives and life histories of sharks, with elasmobranch expert and SOSF Scientific Advisor Dr Dean Grubbs!

Dean is Associate Director of Research for the Florida State University Coastal and Marine Laboratory (https://marinelab.fsu.edu) - @FSUmarinelab. 

Shownotes f...

The shark meat trade is a multi-billion dollar industry. But it receives relatively little attention, and remains understudied. This week, we sit down with conservation scientists Dr Divya Karnad and Dr Trisha Gupta, who have collaborated on research that aims to better understand the drivers and complexities of this trade. Using India as a case study, they are looking for ways to encourage more responsible and sustainable actions at all stages of the supply chain – from source to consumer.

The papers mentioned in this episode are:

Karnad, D., Narayani, S., Kottillil, S., Kottillil, S., Gupta, T...

You asked for more episodes on lesser known or slightly more obscure species - so we're kicking off a new season with a whole episode devoted to just that! Host Isla and special guest, scientist and science communicator Kristian Parton (host of the Shark Bytes Youtube channel) challenge themselves to discuss species and sharky facts that even the most enthusiastic of shark nerds might not have heard of. How about a shark that wags it's tail, or one with glow in the dark armpits? Ever heard of a shark with social anxiety? Or, did you know that venomous sharks...

Dive into the wonders of South Africa's kelp forests on this special episode of World of Sharks.

Join us as we head beneath the waves with marine biologist and SOSF project leader Dr Jannes Landschoff, who has dedicated much of his working life to understanding the unique and vast habitat that is the Great African Seaforest. As the only forest of giant bamboo kelp in the world, the seaforest stretches from the rocky shores of Cape Town, South Africa, to the coastline of Namibia. It is home to an astonishing diversity of species – from minute invertebrates invisible to...

We know that globally, sharks and rays are in trouble. But just how bad is it? And can we still do something about it? 

In this special bonus episode of World of Sharks, host Isla sits down with chair of the IUCN SSC Shark Specialist Group (IUCN SSC SSG), Rima Jabado, and program officer of the IUCN SSC SSG Alexandra Morata to discuss their latest report The Global Status of Sharks, Rays and Chimaeras. This pivotal document compiles the knowledge of over 350 experts from 115 countries and stresses the urgent need to address the major threat facing sharks and...