Jellyfish eat plankton and small fish, which they catch using their venomous tentacles. In some cases, the polyp is free-floating. The first is the polypoid stage, when the animal takes the form of a small stalk with feeding tentacles.
Very often, this polyp is attached to the sea floor, or to another hard surface; it rarely moves around. A group of jellyfish is called a smack; an occurrence of many jellyfish simultaneously is sometimes called a bloom. Journal of Plankton Research 5 5: There is a different process in which they are cleaned, which can take up to 40 days.
Jellyfish reproduce both sexually and asexually. Polyps generally have a mouth surrounded by upward-facing tentacles. Retrieved 7 April A polyp that lives that way is called sessile. Both forms of jelly fish have small tentacles with nematocysts stinging cells that sting and can hurt people on contact.
Some jellyfish glow in the dark this is called phosphorescence. A few species of jellyfish do not have the polyp portion of the life cycle, but go from jellyfish to the next generation of jellyfish through direct development of fertilized eggs.
In most species, spawning is controlled by light, so the entire population spawns at about the same time of day, often at either dusk or dawn. Jellyfish at the medusa stage usually lives only up to six months, after which it dies. Well-fed adult jellyfish spawn daily.
Some of the most dangerous jelly fish include the box jelly Genuses Chironex, Chiropsalmus and Carybdea and the tiny, two-cm-across Irukandji jelly Carukia barnesi ; the venomous sting of these jellyfish can kill a person.
Sometimes they are dried to preserve them. Life cycle[ change change source ] Polyps Most jellyfish undergo two distinct life history stages body forms during their life cycle.
They are often eaten in a kind of salad, with soy sauce or vinegar. In most cases, adults release sperm and eggs into the surrounding water, where the unprotected eggs are fertilized and mature into new organisms. Jellyfish spoil very quickly after they are caught.nd non-conventional information combined with the analytical framework of fuzzy logic that increasing trends of jellyfish abundance were identified to be 62%.
Jelly Fish It's that time of year again -- late summer to early fall -- when a lot of wine-colored, glistening, saucer-shaped, transparent, (but at times somewhat milky) jellies are seen beached.
Yes, they can be seen offshore, but it seems once they enter shallower waters they.
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Jellyfish are animals of the phylum Cnidaria. They are a monophyletic clade, the Medusozoa. Most of them live in the oceans, in salt water, where they eat small sea animals like plankton and little fish, and float in the sea.
Only a few jellyfish live in fresh water.Download