The oceans are full of strange and surprising creatures, but some fish really stand out for their odd shapes and behaviours.
Most of these are creatures we’ll never get to see up close and personal, but it’s absolutely fascinating to know that they exist at all. From glowing lures to see-through skin, these are some of the weirdest fish you’ll ever come across (or simply hear about).
1. Anglerfish with its glowing lure
Anglerfish live deep in the ocean, where sunlight never reaches. They use a glowing lure that dangles from their head to attract prey. The eerie light draws smaller fish close enough to be snapped up in one bite. If you’re fascinated by them, it helps to know their strangeness serves a purpose. The lure is actually bacteria that glow naturally, turning this creepy fish into a master of disguise and survival in the dark.
2. Blobfish and its saggy appearance
The blobfish is often voted the ugliest fish in the world. Out of water, it looks like a drooping blob with a big nose and sad expression. In reality, it only looks like that because it’s pulled from the deep sea. In its natural habitat, the pressure keeps its body firm and more fish-like. What looks weird to us is simply its body adapting to survive at depths most creatures couldn’t handle.
3. Leafy seadragon with camouflage fins
This fish looks more like floating seaweed than an animal. Its leaf-like fins drift gently in the water, making it almost impossible to spot among real plants. It uses this disguise to avoid predators. For people interested in unique marine life, the leafy seadragon shows how incredible camouflage can be. Its survival depends on blending in so well that most divers swim past without ever noticing it.
4. Stargazer with eyes on top of its head
The stargazer gets its name because its eyes sit high on its head, almost pointing to the sky. It buries itself in sand and waits for prey to swim close before lunging out to grab it. While it looks unusual, the odd eye placement makes perfect sense. It allows the fish to stay hidden while keeping watch above, proving that weird designs often have practical uses.
5. Barreleye fish with a see-through head
This deep-sea fish is renowned for its transparent skull. Its eyes sit inside the clear dome, glowing green and pointing upward to spot prey in the dark. It’s one of the strangest sights in the ocean. The clear head helps protect its sensitive eyes while still letting light in. It shows just how extreme evolution can get when survival depends on spotting faint movements in the deep sea.
6. Axolotl with its permanent smile
Although often thought of as an amphibian, the axolotl is closely related to fish in its behaviour. With frilly gills and a constant smile, it looks like a cartoon come to life. Many people keep them as pets. Its weirdness lies in staying youthful. Unlike most creatures, axolotls never fully grow up, keeping their larval features for life. This unusual trait makes them look strange but also fascinating to scientists.
7. Gulper eel with its giant mouth
The gulper eel is known for a jaw that can stretch wide enough to swallow prey almost as big as itself. Its long, whip-like tail glows to attract food in the deep sea, making it both strange and effective. Its oversized mouth looks comical, but it’s a clever adaptation. In the deep ocean, where meals are rare, being able to gulp down anything that comes along can mean the difference between life and death.
8. Handfish that walks on fins
Instead of swimming gracefully, the handfish uses its fins like little legs to walk along the sea floor. Watching it move is strange, almost as if it’s a creature caught between land and sea. This bizarre way of moving makes it one of the rarest and oddest fish around. For scientists, handfish highlight how flexible evolution can be in solving problems like feeding and survival.
9. Parrotfish with beak-like teeth
Parrotfish get their name from the hard, beak-like teeth they use to scrape algae from coral reefs. Their colourful bodies and unusual mouths make them instantly memorable. At night, some even produce a mucus cocoon for protection. What looks odd is actually useful. Their scraping keeps coral reefs clean and healthy. Without them, the balance of life on reefs would shift dramatically, proving that weirdness often serves a greater purpose.
10. Goblin shark with a snapping jaw
This deep-sea shark has a long, flattened snout and jaws that shoot forward to snatch prey. Its strange face and sudden attack make it one of the ocean’s weirdest predators. It’s sometimes called a “living fossil.” While it looks scary, the goblin shark is rarely seen and not considered dangerous to humans. Its odd design is perfectly suited to the depths, where stealth and speed are essential.
11. Sunfish with its massive round body
The sunfish is one of the heaviest bony fish in the world. With a huge, flat body and tiny fins, it looks like half a fish floating awkwardly near the surface. However, it survives just fine in this odd form. Sunfish drift with ocean currents and often bask at the surface. What looks clumsy is actually efficient, showing that survival doesn’t always require elegance.
12. Fangtooth fish with oversized teeth
Despite being small, the fangtooth fish has enormous teeth that stick out even when its mouth is closed. Its fearsome grin looks terrifying, but in reality, it’s too small to be a danger to humans. Its strange design makes sense in the deep sea, where prey is scarce. The teeth help it grab and hold onto anything that passes by, proving that looking scary can be an advantage.
13. Flying fish that glide above water
These fish have long fins that act like wings, letting them glide above the surface for several metres. Watching them leap out of the water makes them look like creatures caught between worlds. Their odd ability protects them from predators. By escaping into the air, they make hunting much harder for the fish chasing them. It’s strange, but it works brilliantly in the wild.