Jellyfish




General&Features

Jellyfish is not true fish. A group of jellyfish is known as a bloom and they gather in a small area, but also have a time factor. The jellyfish does not have any bones and have an umbrella shaped body that is convex. The digestive cavity comprises of gastro vascular cavity and radiating canals.

Jellyfish, which looks like jellies are the major kind of non polyp forms of individuals that originate from the phylum Cnidaria family. They are free swimming marine animals who comprise of an umbrella shaped bell and tentacles.

Characteristics

A Jellyfish ranges around one millimeter in bell height and 2 mts in diameter and bell height. The tentacles and mouth extend beyond the bell dimension. The smallest jellyfish is the creeping jellyfish in the Staurocladia and Eleutheria group which have bell disks from 0.5 mm to a few millimeters in diameter and short tentacles that helps them to move across sea beds.

Distribution

The pacific sea nettle jellyfish

The pacific sea nettle jellyfish

Jellyfish are found in every ocean from the very surface of the deep seas. They are exclusively found in fresh water. Big sized jellyfish are found in coastal zones all over the world. The Jellyfish has roamed all over the seas for at least over a million years and they are known to be the oldest multi organ animal

Diet

Jellyfish is carnivorous animals who feed on plankton, crustaceans, fish, small fish and their eggs as well as other jellyfishes. They hunt with their long flowing tentacles used as drift nets. Their swimming techniques help them to capture prey when their body expands; they help to displace more water that helps to bring in preys within their reach.

Behavior

A White spotted Jellyfish in Hawaii

A White spotted Jellyfish in Hawaii

Most jellyfish are marine animals although a few jellyfish reside in fresh water. The best known freshwater jellyfish is the cosmopolitan Hydrozoans jellyfish. Some of the jellyfish population is restricted to coastal salt water lakes

Reproduction

The Jellyfish reproduces sexually as well as asexually. Upon reaching the adult size, jellyfish reproduces on a daily basis if they are fed well. Spawning is controlled by light and they generally reproduce around dusk or dawn. Jellyfish is either male or female and in most cases, adults release the sperm and eggs into the water where the eggs are fertilized and are formed. The polyp produces asexually by budding process.


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Scientific classification of Jellyfish

Jellyfish

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