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What is dolphin skin made of?
Dolphin skin is made of a highly elastic outer epidermis combined with a dense, collagen-rich dermis underneath. This structure allows the surface of the skin to deform microscopically as water flows across it, absorbing turbulence instead of letting it build up. Unlike most animals, dolphins continuously renew their outer skin layer, which helps keep the surface extremely smooth and free from parasites, algae, and drag-inducing roughness. This unique combination of elasticity, rapid regeneration, and micro-scale surface control is one of the key reasons dolphins can swim at high speeds with remarkably low resistance. 
In the mysterious depths of the ocean, every species has had to adapt to the relentless laws of physics to survive. Among the champions of hydrodynamics, dolphins and sharks dominate the waters, reaching impressive speeds and navigating with an ease that defies comprehension. Behind their performance lies an evolutionary secret: the structure of their skin.
Dolphin skin under magnification — The smooth, elastic surface of dolphin skin helps dampen turbulence and maintain a stable flow of water along the body, reducing drag and improving swimming efficiency.
The Dolphin's Secret: Intelligent Skin
Dolphins, true acrobats of the ocean, can slice through the water at speeds exceeding 50 km/h (31 mph). The common dolphin (Delphinus delphis), for example, is known for its bursts of speed and ability to surf the waves. Its secret lies partly in the dynamic structure of its skin. Composed of an elastic outer layer and a deeper layer of collagen, their skin absorbs and dampens water turbulence. This phenomenon, known as drag reduction, allows them to minimize resistance and conserve energy. Studies have shown that dolphin skin contains microscopic folds that adjust according to hydrodynamic forces, reducing vortices that would otherwise slow them down. Some researchers are now drawing inspiration from this structure to design anti-friction materials for the naval and aerospace industries. One notable example is the development of dolphin-inspired coatings for submarines and ships. Engineers have tested flexible hull materials that mimic dolphin skin’s ability to adjust to water pressure, leading to reduced fuel consumption and increased speed. This technology could revolutionize underwater transportation by making vessels more energy-efficient and maneuverable. 
The Living Armor of Sharks
While dolphin skin is flexible and dynamic, shark skin is a true microscopic armor. Covered in tiny dermal denticles—small rigid structures similar to serrated scales—it plays a crucial role in their speed and maneuverability. The great white shark (Carcharodon carcharias), for example, can reach speeds of up to 56 km/h (35 mph) thanks to this adaptation. The dermal denticles create a textured surface that channels water into fine layers, reducing drag and increasing swimming efficiency. This unique coating also limits the growth of algae and parasites, an evolutionary advantage that allows sharks to maintain optimal hydrodynamics without being slowed down by unwanted organisms. Inspired by this adaptation, engineers have developed biomimetic coatings for ship hulls and swimsuits. In fact, some shark-skin-inspired swimsuits were banned from the Olympic Games after it was proven that they provided swimmers with an unfair advantage.
Why dolphin skin is so hydrodynamically efficientWater flowing over a dolphin’s body does not behave like it does over a rigid surface.
Because the skin is soft and elastic, it can subtly adapt to changes in pressure and flow, reducing the formation of turbulent vortices that normally slow an object down in water. This effect is known as turbulence damping. Instead of breaking the flow into chaotic swirls, dolphin skin helps maintain a smoother boundary layer, allowing water to slide along the body with minimal energy loss. This is why dolphins can cruise efficiently for long distances and still reach explosive bursts of speed when hunting or escaping. 
Shark skin vs dolphin skin — two different solutions to the same problemAlthough dolphins and sharks both move with extraordinary efficiency through water, their skins solve the problem in completely different ways.
Shark skin is covered with millions of microscopic tooth-like structures called dermal denticles. These tiny ridges channel water into narrow streams, reducing drag and preventing turbulent flow from forming. This system is so effective that it has inspired modern aircraft coatings, swimsuits, and boat hulls through biomimicry. Dolphin skin, on the other hand, does not rely on hard structures. Instead, it uses soft, deformable tissue to smooth out water movement dynamically. One species uses micro-armor to guide the flow. The other uses elasticity to absorb it. Two evolutionary paths — same hydrodynamic goal. 
Why Can't Humans Compete?
Unlike dolphins and sharks, the human body is not designed for optimal hydrodynamics. Our smooth skin creates more friction with water, and our muscles are not optimized for efficient propulsion in this element. Even with cutting-edge equipment, we remain far from the natural efficiency of these marine predators. 
Sharkskin: The Banned Technology
In the 2000s, sports equipment manufacturers designed swimsuits inspired by shark skin, called sharkskin suits. These suits were covered with micro-relief structures mimicking the dermal denticles of sharks, reducing drag and improving buoyancy. They allowed swimmers to shave off crucial fractions of a second in competition. Their effectiveness was so remarkable that at the 2008 Beijing Olympics, over 90% of medalists wore these suits, breaking numerous world records. In response to this disparity, the International Swimming Federation (FINA) decided to ban these swimsuits in 2010, arguing that they provided an artificial advantage beyond the athletes' natural abilities. However, while based on the concept of shark denticles, these suits did not perfectly replicate the complex structure of real shark skin. Shark skin functions not only through its texture but also through the flexibility and dynamics of its denticles, which adapt to water flow. Despite its biomimetic inspiration, sharkskin technology remained an approximation of nature's perfection. 
Two Strategies, One Goal
Dolphins and sharks have taken different evolutionary paths to achieve the same result: fluid and efficient navigation. While dolphin skin adapts in real time to turbulence, shark skin stiffens and channels water flow. Two fascinating biomechanical solutions that highlight nature's ingenuity. In laboratories worldwide, these natural marvels are inspiring innovations in fields ranging from maritime transport to sports equipment. Prototypes of dolphin-inspired submarines are being developed, and biomimetic underwater drones based on shark skin could one day revolutionize ocean exploration. Once again, the ocean proves to be an infinite reservoir of solutions for the future. And beyond dolphins and sharks, other marine creatures hold secrets of hydrodynamic perfection. From the streamlined bodies of orcas to the undulating propulsion of cuttlefish, the ocean continues to challenge our understanding and inspire the next wave of human innovation. Frequently asked questionsWhat does dolphin skin feel like?
Dolphin skin feels smooth and firm, with a rubber-like elasticity that allows it to flex under pressure from moving water.
Why is dolphin skin so smooth?
Dolphins continuously renew the outer layer of their skin, which helps prevent algae, parasites, and roughness from building up.
How does shark skin reduce drag?
Shark skin is covered with microscopic dermal denticles that create tiny channels in the water flow, helping reduce turbulence and drag.
Can humans copy dolphin or shark skin?
Yes. Both dolphin-skin-inspired elasticity and shark-skin-inspired micro-textures have influenced biomimetic designs for surfaces built to reduce drag.
Read More : The business of Sharks
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Serge Melesan
Underwater & Fine Art Ocean Photographer Specialist in Fine Art Ocean Photography. Published in Oceanographic Magazine & Earth.org. National Geographic Traveller – Portfolio Winner (2023). Archives
Janvier 2026
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