JellyFish Facts

Brown Jellyfish

Brown Jellyfish picture

Brown Jellyfish

Jellyfish are mysterious and fascinating creatures that inhabit the oceans of the world. They are actually classified under the animal kingdom, and are members of the phylum Cnidaria, which is a marine group having a simple structure, of both fixed and mobile animals. Instead of a brain, the jellyfish has a network of nerves, which have receptors capable of detecting light, odor and other stimuli. Based on this, the jellyfish is able to co-ordinate appropriate responses.

The jellyfish has 200 different species and these come in a variety of sizes, shapes and colors. The size of their bell-shaped bodies range from a few centimeters in diameter to up to seven feet. The tentacles of certain jellyfish can reach up to 100 feet in length. Out of the 200 varieties, 70 of them are considered to be venomous and their sting is quite painful. All jellyfish, regardless of their size or venom, are very fragile marine animals, as they contain less than 5% of solid organic matter. Between the outer layer of epidermis and the inner layer, there is a gelatinous material called the mesoglea, which forms the bulk of any jellyfish and it consists of 95% water.

Jellyfish come in many colors and some are also transparent. The colors may also differ in the same type of jellyfish. The sea nettle jellyfish is found in brown color as well. This jellyfish has two varieties, the Chrysaora quinquecirrha or the Atlantic sea nettle, and the Chrysaora fuscescens or the Pacific sea nettle.

The Pacific sea nettle jellyfish inhabits the Pacific Ocean and is found mainly near the coast from California to Alaska. The diameter of its bell-shaped body ranges between 50 centimeters to 3 feet across. It has 24 tentacles and they are between 12 to 15 feet in length. It also has spiralling oral arms of the same length. There is an abundance of these creatures in the coastal waters in late summer. It is on display in many aquariums and is considered easy to maintain indoors.

The Atlantic sea nettle is found in the Atlantic estuaries. It has small white dots and sometimes reddish brown stripes. The tentacles of this jellyfish has nematocysts which has a venom, that it uses to immobilize its prey. If a human is stung by this jellyfish he will have moderate to severe pain. The sting is not fatal, but death can occur out of a severe allergic reaction. The best way to neutralize the sting, would be to spray vinegar on the affected part. Care should be taken, never to rub the affected part, as this will fire the latent nematocysts.

The shape of the sea nettle is radially symmetrical and its mouth is located at the underside of the bell body. This mouth opens directly into the gastrovascular cavity which serves the function of a stomach. The tentacles surrounding the mouth region will capture food and deliver it into the opening. The mouth is the only opening in this jellyfish and it serves as an excretory organ too. They can reproduce sexually as well as asexually.

Learn more about Jellyfish, different Jellyfish Species, general Jellyfish Information, Jellyfish Pets and Jellyfish Safety

Written by and Sudarsana Sinha.

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