Read aquarium and aquatic animal guides, from fish species to tank ecology and care considerations.
The Yeti Crab is one of the strangest animals ever discovered in the deep ocean. With its pale body and hair-like bristles covering its claws and underside, it looks so unusual that scientists and the public quickly gave···
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Trachinus draco, commonly known in English as the greater weever fish, is a small coastal fish famous for its venomous spines and extremely painful sting. In Spanish it’s often called pez araña (“spider fish”) or som···
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The ocean is full of strange, almost unreal creatures—organisms so transparent and delicate that you might not even notice them unless you’ve seen a bloom up close. Salps are one of those animals. They look like tiny d···
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The blue dragon (Glaucus atlanticus) is a small marine invertebrate that lives in the open ocean. It is pelagic, meaning it typically stays far from shore rather than living on the seafloor or near coastal reefs. Despite···
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Overview: Are Sharks as Dangerous as We Think?Sharks have one of the worst reputations in the animal kingdom. Movies, headlines and viral videos make them look like relentless man-eaters—yet statistically, you are far m···
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Manatees—often nicknamed “sea cows”—are among the few fully aquatic mammals outside cetaceans, along with their close cousins, the dugongs. Since their land-dwelling ancestors returned to the water roughly 50 million···
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The idea of a shark cruising just off the beach usually sets off alarm bells. But meet the lemon shark (Negaprion brevirostris): a large, yellow-tinged coastal species that’s surprisingly tolerant, highly studied, and f···
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Curious about which marine species are on the brink? Iconic examples include the vaquita, blue whale, Hector’s dolphin, sea otter, and giant manta ray. Like every ecosystem on Earth, the oceans hold many species with ve···
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Whales (family Balaenidae) are among the largest creatures on Earth and have existed for millions of years. They belong to the group of baleen whales (Mysticeti), which are mammals adapted to aquatic life and possess bal···
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Since ancient times, tuna has been a highly valued food. However, it is often difficult for people to distinguish between tuna and bonito. Even within tuna, there are different categories such as bluefin tuna, yellowfin ···
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Many people mistakenly believe that sea sponges are not living organisms, or confuse them with aquatic plants. In reality, sea sponges are simple invertebrate animals. They belong to the phylum Porifera, one of the oldes···
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Seals, sea lions, and walruses are all carnivorous marine mammals that belong to the superfamily Pinnipedia. Because they share many physical traits and behaviors, people often confuse them. However, each belongs to a di···
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Sirenian mammals (Order Sirenia) are a group of marine placental mammals with only four living species today. Their name comes from the mythical “sirens” or mermaids, since early sailors often mistook female sirenians ···
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Sea turtles belong to two main families: Cheloniidae and Dermochelyidae. Within these groups, we find the green turtle, loggerhead turtle, olive ridley turtle, hawksbill turtle, flatback turtle, Kemp’s ridley turtle, an···
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The vaquita (Phocoena sinus), also known as the “little sea cow” or “cochito,” is the rarest marine mammal in the world and one of the most endangered. Endemic to the northern part of the Gulf of California, Mexico, ···
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Dolphins are highly popular marine mammals, instantly recognizable by their naturally upturned mouths that give the impression of a permanent smile. Combined with their playful, curious, and friendly nature, they are amo···
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Among the incredible biodiversity of marine ecosystems, one group of fish stands out for its seemingly magical ability to soar above the sea: the flying fish. While they don't truly fly like birds, these remarkable c···
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The box jellyfish (Chironex fleckeri) is considered one of the most venomous creatures on Earth. A single individual contains enough venom to kill up to 600 people. Since 1954, this species has been linked to over 5,500 ···
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Antarctica, the southernmost continent on Earth, spans approximately 14 million square kilometers. It is one of the coldest, most remote, and least inhabited places on the planet. Despite its harsh conditions, this froze···
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Covering over 70% of the Earth's surface, the oceans play a critical role in shaping the planet's climate and sustaining life. Ocean currents regulate weather patterns, and marine ecosystems support an astonishin···
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The Portuguese man o’ war (Physalia physalis), also known as the false jellyfish or bluebottle, is a marine hydrozoan from the phylum Cnidaria. Despite its jellyfish-like appearance, it is not a single organism, but rat···
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Commonly known as sharks or selachians, the cartilaginous fish that belong to the superorder Selachimorpha are among the most fascinating and extensively studied marine animals. Their advanced predatory abilities and rem···
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The evolutionary history of vertebrate animals begins with curious organisms that might not resemble typical animals at first glance—yet they are indeed animals. These are sea squirts. Though small and sedentary, often ···
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The ocean, as the most vast and mysterious ecosystem on earth, breeds a rich variety of life forms. Organisms living in the ocean or saltwater areas of coastal estuaries are collectively called marine organisms. They not···
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