Conservation Photography

Nudibranchs – Photo taken in Indonesia – Jack’s April Underwater Photograph

Nudibranchs are an order of marine gastropod consisting of more than 3,000 species. They are soft-bodied, slug-like animals many of which are adorned with bright colors and extravagant body forms. Most nudibranch species live on reefs in temperate and tropical seas and are a popular species to observe by SCUBA divers around the world.

With so many species of nudibranch, their forms are very diverse. The smallest species is just 0.16 in (4 mm) long while the largest species can grow up to 23 in (60 cm) long. They all have small, simple eyes set into their bodies that are able to do little more than discern various levels of light.

Nudibranchs are named after the Latin word nudus meaning ‘naked’ and the greek bránkhia meaning ‘gills’. This is in reference to the fact that dorid nudibranch species breathe through a ‘naked gill’ shaped into branchial plumes – much like the alveoli of a human lung – but external to their bodies.

Nudibranchs can be found in oceans around the world, even in the Arctic and Antarctic. The largest diversity of nudibranchs occurs in warm waters on shallow reefs, although a recently discovered species was found at more than 8 200 ft (2 500 m). Most nudibranchs are benthic, crawling around on the seafloor or reef rather than swimming, in the water column. However, during their larval stages, most species are planktonic. They have tentacles on their heads that act as sensory organs and are sensitive to touch, taste, and smell as they move across the substrate in search of food and mates.

Most nudibranch species have simple guts and mouths featuring a radula – a simple, tongue-like organ that helps to eat. Nudibranchs are carnivorous predators, typically feeding on various species of sea sponges. Their specific diet depends on the species itself and the environment it inhabits, and many have formed close evolutionary relationships with their prey.

Nudibranchs are susceptible to a wide host of marine animals. However, they have developed various unique and effective defense strategies that help them to avoid predation as much as possible. Some have evolved to appear like their prey, marine sponges, and thus avoid detection by a predator through camouflage. In other species, the opposite is true, and they have intensely bright colors and patterns, warning predators of their chemical defenses that most predators such as fish do not find edible.

Perhaps even more fascinatingly, some nudibranchs that feed on hydrozoids, a family of sedentary animals related to jellyfish, can store the stinging cells of the hydrozoid in their own skin. They pass through the nudibranch’s digestive system without harming it and then are concentrated in the animal’s hind end. Any animal that tries to bite one of these nudibranchs will receive a painful sting and will likely not go near one again.

In all nudibranchs, which have both female and male sex organs, the sexual openings are on the right side of the body. However, they still require a mate in order to reproduce, as they are not able to self-fertilize. Following a dance-like courtship, two nudibranchs will cross-fertilize, each proceeding to lay eggs fertilized by the other.

The number of eggs each species normally lays variest widely. Some species such as Vayssierea felis lay just one while Aplysia fasciata may lay more than 25 million eggs. Larval nudibranchs look similar to larger nudibranchs but are generally smaller and with fewer extravagant appendages and, as we’ll explore further, a shell. Most nudibranch species will live for several months, with some living for up to a year while other species having a life cycle of only a few weeks.

See more of Jack Fung’s underwater photography on Instagram

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Conservation Photography

National Geographic Explorer Thomas Peschak to Receive 2025 Eliza Scidmore Award for Outstanding Storytelling

This year’s award recognizes Peschak’s legacy of visually illuminating ecosystems, including the people advocating for them, while connecting audiences to the importance of conservation

Cover of the Amazon Special Single-Topic October 2024 Issue of National Geographic Magazine. Photo by Thomas P . Peschak/National Geographic.

Award-winning photographer and National Geographic Explorer T homas P. Peschak will receive the National Geographic Society’s 2025 Eliza Scidmore Award for Outstanding Storytelling for his long legacy of conservation storytelling at National Geographic and beyond.

The award — named for the writer and photographer Eliza Scidmore, the first woman elected to the Society’s Board of Trustees in 1892 — recognizes individuals whose work focuses on immersive storytelling to advance our understanding of the environmental and conservation issues we face, with the ultimate goal of supporting societies in making the best decisions for a healthier planet.

While Peschak began his career training as a marine biologist specializing in human-wildlife interactions, he eventually moved to photojournalism after realizing his impact on conservation could be greater through storytelling to inspire change. Now, Peschak’s accomplishments are world-renowned, with 18 Wildlife Photographer of the Year wins, seven World Press Photo Awards, and most recently, the 2024 Wildlife Photojournalist Story Award — all for his significant work documenting some of the most crucial conservation stories of our time.

Ariaú River, Brazil – A pink river dolphin cruises in the shallows of a flooded forest in Brazil’s Ariaú River. Its unique anatomy allows it to swim easily through these waters. Narrow dorsal fins, long snouts and large, flexible flippers let the mammals slip in and out of submerged branches. “They basically fly between the trees,” marine biologist Fernando Trujillo says, “following the fish.” Featured in the Special Single-Topic October 2024 Amazon Issue of National Geographic Magazine. © THOMAS P. PESCHAK/NATIONAL GEOGRAPHIC

“Tom’s work is rooted in a commitment to drive meaningful impact. Whether documenting vital ecosystems, the plight of at-risk species or the stories of communities, his images open our eyes to the world, make it clear what’s at stake and inspire us to act,” said Jill Tiefenthaler, CEO of the National Geographic Society. “Tom’s dedication to illuminating and protecting the wonder of our world defines his work, and it’s why we are deeply honored to present him with the 2025 Eliza Scidmore Award for Outstanding Storytelling.”

Most recently, he was the lead storyteller on the National Geographic and Rolex Perpetual Planet Amazon Expedition, a multiyear series of solutions-centered science expeditions spanning the entire Amazon River Basin. Working with fellow Explorers and local communities, Peschak immersed himself in the basin for 396 days to reveal its aquatic and wetland habitats. The single-topic October issue of the National Geographic magazine was devoted entirely to Peschak’s stunning images of the Amazon Expedition. Starting with ice axes and crampons in the icy high Andes and finishing with scuba gear in the Atlantic Ocean, he created the first-of-its-kind comprehensive photographic archive of our planet’s most iconic and biodiverse river system.

Wolf Island, Galapagos Islands – A ground finch pecks at the base of a Nazca booby’s flight feathers and drinks the blood. © THOMAS P. PESCHAK/NATIONAL GEOGRAPHIC

To date, Peschak has photographed 20 National Geographic magazine features on various subjects, including manta rays, sea turtles, climate change in Antarctica and the global seabird crisis, the latter of which resulted from a Society grant in 2017. Seeking to address the loss of 230 million seabirds over 60 years, Peschak mined archives for images of seabird colonies in Peru taken 100 years ago and re-photographed those same locations, presenting these images side by side in an innovative multimedia display to visualize this staggering absence in the hopes of protecting this ecologically critical and unique species.

Aldabra Atoll, Seychelles Islands – Blacktip reef sharks wait for the tide to refill the lagoon at remote Aldabra Atoll. © THOMAS P. PESCHAK/NATIONAL GEOGRAPHIC

In addition to his extraordinary photojournalistic work, Peschak has written and photographed eight books, including “Sharks and People,” which chronicles the relationship between people and sharks around the world, and “Wild Seas,” a collection of photos taken by Peschak documenting the beauty and fragility of underwater life and wild coastlines from around the world. He has also appeared as a speaker for the National Geographic Live! series, having presented over 20 shows in 15 cities on three continents.

Mexico – A manta ray being cleaned by Clarion angelfish. Today these animals play an important role in tourism in places like Mexico’s Archipiélago de Revillagigedo Biosphere Reserve, in the Pacific Ocean about 240 miles southwest of Baja’s southern tip. © THOMAS P. PESCHAK/NATIONAL GEOGRAPHIC

“Photography and storytelling aren’t just about highlighting places with unique biodiversity, especially when areas like the Amazon basin are under siege every day from issues like overfishing, pollution and climate change,” said Peschak. “To capture the full scale, it’s imperative to highlight these challenges as well as the people who are facing them head-on: local communities, Indigenous peoples, researchers and other Explorers. The goal and hope with my work has always been to photograph places I love in order to help save them, so it is a true honor to receive this award and get to continue to work on important stories of conservation.”

Bahama Islands – Green sea turtles congregate near a dock in the Bahamas. © THOMAS P. PESCHAK/NATIONAL GEOGRAPHIC

While remaining a cornerstone of storytelling work at the Society, Peschak continues to focus on marine conservation storytelling more broadly, serving as the director of storytelling for the Save our Seas Foundation — an organization he has been an integral part of for almost two decades. He is also a founding director of the Manta Trust and a senior fellow of the International League of Conservation Photographers.

Peschak will be honoured as the 2025 Eliza Scidmore Award recipient during the annual National Geographic Society Storytellers Summit in February 2025. To learn more about Peschak and other Explorers’ work, visit our website here.

ABOUT THE NATIONAL GEOGRAPHIC SOCIETY

The National Geographic Society is a global nonprofit organization that uses the power of science, exploration, education and storytelling to illuminate and protect the wonder of our world. Since 1888, National Geographic has pushed the boundaries of exploration, investing in bold people and transformative ideas, providing more than 15,000 grants for work across all seven continents, reaching 3 million students each year through education offerings, and engaging audiences around the globe through signature experiences, stories and content.

Conservation Photography

Manta Ray Magic: Witnessing a Feeding Frenzy in the Great Barrier Reef – Photography by Aliya Siddiqi

While working at an island that’s known as “the home of the manta ray,” it’s easy for most of us staff to get jaded at seeing one or two manta rays…per day. Maybe they do a quick cruise past, or maybe a stop at the cleaning station. But when these mantas do aggregate around this small island on the Great Barrier Reef, those are the days that turn into pure magic. And it reminds us all as to why these animals are so spectacular to interact with.

Manta rays, more specifically Manta alfredi, are unique in the contrast between their large size and inquisitive behavior around humans. Despite reaching average lengths of three to five meters wingtip to wingtip, they are filter feeders and seek out the smallest creatures in the ocean to feed on. The diets of manta rays are found to consist mostly of different types of zooplankton, small creatures that range from microscopic single-celled organisms to the larvae of larger animals like crabs, octopuses, and fish. Zooplankton are heterotrophic, meaning that they obtain their energy from feeding on other organisms including phytoplankton and other zooplankton. In this photo series, all of those small dots sparkling in the photos indicate a high number of plankton.

According to scientists studying the island aggregation site, the higher biomass of zooplankton seems to be a result of “local concentration and retention processes around the island”. Though still unknown why these zooplankton blooms around the island happen, when it does become what we call “manta soup,” the foraging behaviour of the manta rays gives guests and staff some unforgettable experiences. The elasmobranchs ensure filter-feeding efficiency by looping around consistently in nutrient-dense areas. All one must do is stay in that same spot and wait for the mantas to swoop in and detour around you – though with strong currents, this is often more easily said than done. However, some days you get lucky when the weather window blesses you with no wind, high zooplankton biomass, and an influx of manta rays.

These photos come from a day like that, making it almost too easy for an amateur photographer like me to capture these charismatic animals. The mantas were swooping in and out, with some of the females displaying quite pregnant bellies. Like any aggregation site, tourism operators greatly benefit from the frequency at which these animals appear. Their docile and curious nature also makes them excellent flagship species for marine conservationists. Listed as Vulnerable to Extinction by the IUCN, these experiences with the public allow for an opportunity to discuss the challenges our oceans are facing, and why protection is of the utmost importance.

Conservation Photography

Cleaning Stations & Coastal Cruising – Under the Waves with Karim Iliya, October 2024

This is a turtle cleaning station. You can see the turtle in the back getting cleaned by a fish which eats parasites and algae off the turtle’s skin, shell, and scales. The turtle in the front is waiting its turn. This is a symbiotic relationship in which the turtles get cleaned, and the fish get a meal.

A Hawaiian green sea turtle cruises beneath the waves off the coast of Hawaii. This turtle was eating algae off the rocks, seemingly unaffected by the powerful turbulent water all around. When not eating algae, these turtles spend much of their time laying on the nearby beach .

Karim was published in National Geographic magazine for his humpback whale photography. He now leads his own trips so that others can swim with whales.

If you are interested in swimming with or photographing humpback whales, Karim guides people on small trips between August and October every year in Tonga. Visit www.dancewithwhales.com to find out more

To see more of Karim’s work, visit his website at www.karimphotography.com