Jellyfish Essay

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JELLYFISH Jellyfish are very unique, aquatic creatures. They have drifted along on ocean currents for millions of years, even before dinosaurs lived on the Earth. They just float around and look weird. A jellyfish jiggles like gelatin, and some just look like small, clear blobs. But others are bigger and more colorful with a bunch of tentacles that hang down underneath it, kind of like an octopus. The body of a jellyfish consists of 95 percent water, the wall of a jellyfish is very fragile. They have no brain, no respiratory system, and no circulatory system. The average length of a jellyfish tentacle is one to ten meters long. Located inside the tentacles are the nematocysts or stinging cells which contain venom-filled threads. Jellyfish have only one opening on their body, the mouth. The mouth is located inside a short tube on the center of the body. The sting of a jellyfish is different for each type of jellyfish. They sting by releasing venom from their nematocysts. There are few species that cannot sting at all. The sting of most jellyfish is harmless, but there are few varieties that can cause death by a single sting. Jellyfish sting for the following two reasons: to capture prey and for defense or protection. The habitat of a jellyfish is very spread out. They live in all four oceans. Some live in tropical regions, some live in temperate regions, and some live in arctic regions. Jellyfish can be either freshwater or saltwater jellyfish. They can be found in all levels of water. Jellyfish are carnivores. They capture their prey by trapping it with their tentacles and injecting it with venom. This will either paralyze or kill the prey. Jellyfish digest their food very quickly. They wouldn’t be able to float if they had to carry a large undigested meal around for a long period. They dine on

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