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Jellyfish

Jellyfish or jellies are the major non-polyp form of individuals of the phylum Cnidaria. They are typified as free-swimming marine animals consisting of a gelatinous umbrella-shaped bell and trailing tentacles. The bell can pulsate for locomotion, while stinging tentacles can be used to capture prey.

 

Jellyfish are found in every ocean, from the surface to the deep sea. Scyphozoans are exclusively marine, but some hydrozoans live in freshwater. Large, often colorful, jellyfish are common in coastal zones worldwide. Jellyfish have roamed the seas for at least 500 million years, and possibly 700 million years or more, making them the oldest multi-organ animal.

 

These are moon jellys, moon jellyfish, common jellyfish, or saucer jellys and are a widely studied species of the genus Aurelia. All species in the genus are closely related, and it is difficult to identify Aurelia medusae without genetic sampling.

 

The jellyfish is translucent, usually about 25–40 cm (10–16 in) in diameter, and can be recognized by its four horseshoe-shaped gonads, easily seen through the top of the bell. It feeds by collecting medusae, plankton, and mollusks with its tentacles, and bringing them into its body for digestion. It is capable of only limited motion, and drifts with the current, even when swimming.

 

Aurelia aurita (also called the moon jelly, moon jellyfish, common jellyfish, or saucer jelly) is a widely studied species of the genus Aurelia. All species in the genus are closely related, and it is difficult to identify Aurelia medusae without genetic sampling; most of what follows applies equally to all species of the genus.

 

The jellyfish is translucent, usually about 25–40 cm (10–16 in) in diameter, and can be recognized by its four horseshoe-shaped gonads, easily seen through the top of the bell. It feeds by collecting medusae, plankton, and mollusks with its tentacles, and bringing them into its body for digestion. It is capable of only limited motion, and drifts with the current, even when swimming.

 

These animals are exhibited at the Blue Reef Aquarium Portsmouth. Blue Reef is a national chain of public aquariums in England. Blue Reef Aquarium Portsmouth is an aquarium situated on Clarence Esplanade, Southsea, Portsmouth, England. Over 40 living displays are home to various species from tropical sharks and lobsters to seahorses and tropical fish.

 

At the Aquarium’s heart is a large ocean tank where an underwater walkthrough tunnel offers close encounters with reef fish.

 

en.wikipedia.org/wiki/Jellyfish

 

en.wikipedia.org/wiki/Aurelia_aurita

 

en.wikipedia.org/wiki/Blue_Reef_Aquarium

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Uploaded on May 10, 2015
Taken on February 22, 2015