Most Dangerous Aquatic Animals

The ocean is a vast world full of beautiful but potentially dangerous creatures. Sharks are widely known as dangerous creatures of the sea, but there are many other aquatic animals that can injure and kill. For example, certain types of aquatic reptiles, fish and even invertebrates like coral can be dangerous.

  1. Box Jellyfish

    • There are many species of jellyfish that live in the ocean, but not all of them are as dangerous as the box jellyfish. Most jellyfish sting if they come in contact with another animal, but the sting of a box jellyfish can be fatal since its venom is among the most deadly in the world. The box jellyfish carries a venom that releases toxins that can instantly stun prey and attack the heart and nervous system. The pain from a box jellyfish sting can cause victims to go into shock and drown before reaching the shore for help. Even if the sting is treated quickly, long-term pain and scarring may result.

    Great White Shark

    • These large aquatic animals are some of the most infamous predators of the sea, starring in films like "Jaws" and "Deep Blue Sea." Though these films may not be entirely accurate in their portrayal of the great white shark, the danger these creatures pose is real. Out of the 100 or so shark attacks that are reported annually, between one-third and one-half of them can be attributed to great white sharks. These creatures have up to 300 serrated teeth arranged in rows within their enormous mouths, and they can grow to more than 15 feet in length. Though their numbers are decreasing because of accidents and overfishing, great whites are still a real danger in the ocean.

    Lionfish

    • Though they may be small compared to the bulk of a great white, lionfish carry a dangerous venom in their myriad spikes and spines. Lionfish grow to a maximum of 15 inches and can be found in the Indo-Pacific region. A sting from a lionfish can cause severe pain, headaches, breathing difficulties and vomiting. If not treated properly, severe complications may occur, but the venom is rarely fatal to humans.

    Yellow-Bellied Sea Snake

    • Though is has small fangs, the bite of a yellow-bellied sea snake can be extremely dangerous, even fatal. These sea snakes have venom more toxic than the deadliest cobra, and it does not take long for the poison to go into effect. The bite itself may go unnoticed, but symptoms including aching, stiffness and paralysis may follow shortly. Found in most oceans throughout the world, sea snakes live entirely in the water and rarely venture onto land. In most cases, sea snake bites are defensive -- these creatures rarely attack humans unprovoked.

    Stonefish

    • The most venomous of all fish, the stonefish carries a deadly neurotoxin that can be fatal to humans. These fish are highly camouflaged, and they can be difficult to distinguish from rocks and sand on the ocean floor. A row of spines along the stonefish's back contains the deadly venom that can be released if accidentally stepped on or eaten by another fish. Stonefish venom can become fatal in as little as two hours if not properly treated.