![]() Immortal Jellyfish ( Turritopsis dohrnii) Through clinical trials researchers are getting closer to producing an antidote to the sea wasp jellyfish’s venom. Scientists are researching why the sea wasp jellyfish’s venom is so powerful, and have found a special component of the venom that drills holes in the victim’s red blood cells. This venom is best suited for capturing prey and isn’t useful to deter predators, so sea wasps are a common food source for leatherback turtles and other large sea creatures. Contact with the ten-foot (3.04 m) tentacles causes immediate pain followed by cardiac failure, leading to death of the prey within a few minutes time. The sea wasp is the most venomous jellyfish and produces the strongest and fastest reaction of any venomous animal. This is the largest cubozoan jellyfish with a bell of approximately eight inches (20.32 cm) and tentacles up to ten feet long (3.04 m). The sea wasp jellyfish is found in the coastal waters of Australia and Southeast Asia. While it should be easy to remove jellyfish blooms from the water, Nomura jellyfish have a special defense mechanism. When they feel threatened they release billions of sperm and eggs which attach to the ocean floor and grow into more jellyfish. These scientists believe Nomura jellyfish are able to grow so large from a combination of hydroelectric projects and farming along the Yangtze river that have created enriched nutrient habitats in the Sea of Japan. Nomura jellyfish have become such a big problem for China and Japan that special research teams have been formed to understand why this species grows so large and how the population can be reduced to a safer level. ![]() Nomura jellyfish are found in the seas between China and Japan and often create jellyfish blooms that decimate fish populations. One of the largest species of jellyfish, the Nomura jellyfish can grow up to six feet (1.82 m) in diameter and usually weigh over 400 pounds (181.43 kg). Moon jellyfish are one of the species most commonly eaten by people. Moon jellyfish are bioluminescent and glow a light purple when bumped in the dark. Their sting is not strong enough to penetrate human skin so they’re safe to touch, making moon jellyfish common aquarium species. They have distinctive half circles on the bell which are reproductive tissues. Moon jellyfish are one of the most common jellyfish and can be found in coastal waters of all oceans except the Arctic Ocean. People snorkeling through these waters have reported a slight stinging sensation in the water, likely caused by the upside-down jellyfish’s mucus. While the venom from a single upside-down jellyfish isn’t very strong, once one jellyfish releases envenomated mucus the rest of the colony follows suit, making the water dangerous for small fish. These jellyfish release mucus filled with nematocysts into the water to capture prey and ward off predators. Upside-down jellyfish have a unique defense and hunting mechanism. Upside-down jellyfish are usually found in sheltered coastal areas of tropical waters around the world. Instead of floating bell-up through the ocean, they sit with their bell on the ground, extending their tentacles up to catch food. Upside-down jellyfish act differently than most jellyfish. Lion’s mane jellyfish are bioluminescent and have tentacles covered in millions of stinging cells, holding venom that can be very painful to humans. But since they’re mostly found in cold water, lion’s mane jellyfish don’t normally interact with humans. Lion’s mane jellyfish are mostly found floating in the open ocean in the Arctic and North Pacific Oceans. Their name comes from the approximately 1,200 tentacles that make up their mane. The lion’s mane jellyfish is the largest species of jellyfish, with some specimens coming close to the size of a blue whale. The biggest recorded lion’s mane jellyfish had a seven-foot (2.13 m) diameter bell and 112 feet (34.13 m) long tentacles. ![]() Lion’s Mane Jellyfish ( Cyanea capillata) Jellyfish Diet & How They Catch Their Food.Near Shore and Deep Sea Jellyfish Species.Physical Description and Jellyfish Lifespan.The Complete Jellyfish Guide: Lifespan, Diet, Predators, Sting & Myths.15. White-Spotted Jellyfish (Phyllorhiza punctata).14. Cauliflower Jellyfish (Cephea cephea).Fried Egg Jellyfish (Cotylorhiza tuberculata) Mangrove Box Jellyfish (Tripedalia cystophora) Four-Handed Box Jellyfish (Chiropsalmus quadrumanus)
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