Jellyfish

* They are passively transported by the water currents. * They can swim with rhythmical contractions of the bell (muscles) that propel it with the force of the water pushed from inside the bell, sort of like jet propelling does with air jets, the action creates an equal and opposite reaction.
it floats and drifts with the current
jelly fish moves its body to move in waterA jellyfish opens up its umbrella-like body wider than usual, and then shrinks it back to size. The water that was inside the umbrella-like body structure was squeezed out when the body structure shrank to normal size, so the aqua jet propelled the jellyfish a few feet. That is how a jellyfish moves.

because it is to cold for them and enemies eat them

Jellyfish have been proven to be the most energy efficient swimmers of all animals.They move through the water by radially expanding and contracting their bell-shaped bodies to push water behind them.The main form of movement is when the Jellyfish raises its stingers high up around it, and shoots them back down, causing the water to help it move forward. The water currents move the jellyfish around otherwise.

The Portuguese Man o' War lives at the surface of the ocean, with its float above the water, serving as a sail, and the rest of the organism hanging below the surface. It has no means of propulsion, but is moved by a combination of winds, currents, and tides. It is found in open ocean in all of the world's warm water seas but most commonly in the tropical and subtropical regions of the Pacific and Indian oceans, and the northern Atlantic Gulf Stream. Strong onshore winds may drive them into bays or on beaches.

They don't actually migrate, as they stay in the same ecosystem all year. But they do travel, especially within lakes, due to seasonal heating.
Jelly fish sort of migrate. Each day the travel from west to east, then back to the west. To learn more info go to http://marinelakes.ucmerced.edu/Lakes/OTMigrate.html Just copy and paste this adress instead of re-typing it all.

An octopus is more aggressive but , doesn't sting.

A jellyfish's venom is incredibly complex as it directly attacks the central nervous system as well as other organs. The venom can kill within three minutes after being stung. Box jellyfish venom have caused over 72 known fatal deaths.

no they don't but they do sting you

Jelly just refers to the fact many of them are semi-transparent , and the bodies are kind of like jello jigglers.

They have a jelly-like substance in them

I was there in August as well and I found that I was surrounded by small jellyfish. No bigger than the palm of my hand, with stingers about 5 - 6 cm long, they could not sting us. I went into the water daily and felt these harmless jellies, I never got stung, but I did see 2 larger ones about 12 meters out. They looked very dangerous but didn't come too close. I was in a hotel down the beach from the Atlantis hotel.

Jellyfish have been around for 500 million years.
Jellyfish have roamed the seas for at least 500 million years.

The tentacles of the jellyfish ar dangerous not its body, but overall yes it is a dangerous sea creature, some jellyfish have tentacles as longas 10 to 9 feet and are not visible to humans naturally. The tentacles when on contact with skin leave small posion that makes the person suffocate and causes their body to go through immnense amount of pain!( i will be corrected on the effects of the sting so please do not refer to the effects that i have said as the accurate ones )

some jellyfish are transparent and are hard to see, the only dangerous part in a jellyfish are the tentacles which suck!

so they cannot be spotted by any predators. they are also transparent, witch means the jellyfish is camouflaged. some aren't so transparent. the box jellyfish is quite colorful. some jellyfish are still because the current takes them with it such as the mediterranian jellyfish. the Enchanted Jellyfish is a very colorful creature. so most jellyfish are very active but some are lazy current users.

---- The Box Jellyfish is transparent and almost invisible to the human eye.

---- Although it could be considered different shades of blue, or clear/white. ----

They are only about 2 and a half centimeters long, they are very, very small, most people don't ever see them, only trained scientists have ever even been able to find one, because they are so small, many people do not know they've been stung by a jellyfish, and how much danger they are in.

Each species of jellyfish have their own habits. The mating habit known as mass spawning, allows jellyfish to mate without even needing to meet. The feeding habit of most jellyfish is floating about and eating whatever comes along.

There is an anti-venom treatment for only one species of box jellyfish, Chironex fleckeri. Treatment for stings from all box jellyfish species starts with a complete flushing of the area by a mild acidic solution such as vinegar, or citric acid. This inhibits the unfired nematocysts from further envenoming the victim. All remaining tentacles should then be removed by picking, scraping, or flushing them off the skin with salt water. Do not press on the tentacles, nor rub them off with sand. Immediate medical assistance should be sought, since box jelly envenomation may be life threatening.

If not a box jelly sting, or if stung swimming in an area not typical for box jellies, do not use vinegar. Also, do not use urine, alcohol, meat tenderizer, acidic solutions, baking powder, or even fresh water. All of these have been demonstrated to trigger further envenomation in certain jellyfish species. Start treatment by flushing with sea water while removing all remaining pieces of tentacle. Once the area is free of tentacles, heat can help break down the venom proteins, so soak the affected area in hot water, or under a hot shower for 20 minutes. Fresh water is fine at this point if all remaining pieces of tentacle have been removed. The water should be as hot as possible (without scalding, of course). If heat is not available, an ice pack can reduce the pain, but it only offers temporary relief.

Again, please do not listen to old wives tales about urine, alcohol, and other home remedies; science has proven them to be less than worthless treatments. In short, flush box jelly stings with vinegar if available and call medics. Otherwise, flush with sea water and remove any remaining pieces of tentacle. Treat with heat, and ice is nice.

Jellyfish go through two life history stages throughout their lifetime, the first form is called a polypoid and the second is the jellyfish.

Sunfish are known to eat jellyfish in the deeper parts of the ocean. They are also known to eat puffer fish.

jellyfish have stinging cells called cnidoblasts that produce capsules full of poison filled barbs...whenever someone or something brushes against these capsules the capsules explode and pierce the victim

please recommend

60 degrees in water like bays or oceans. The moon jellyfish is the most commen in the U.S.

Depending on the species, the body contains between 95 and 98% water. Most of the umbrella mass is a gelatinous material - the jelly - called mesoglea which is surrounded by two layers of protective skin.