Englisch-Deutsch-Übersetzungen für jellyfish im Online-Wörterbuch manifestograto.com (Deutschwörterbuch). Viele übersetzte Beispielsätze mit "jellyfish" – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen. Die Pluralform jellyfish wird insbesondere in kollektiver Bedeutung verwendet; die  Englischer Wikipedia-Artikel „Jellyfish“: [1, 2] PONS Englisch-Deutsch.
WürfelquallenÜbersetzung im Kontext von „"jellyfish“ in Englisch-Deutsch von Reverso Context: jellyfish. Die Pluralform jellyfish wird insbesondere in kollektiver Bedeutung verwendet; die  Englischer Wikipedia-Artikel „Jellyfish“: [1, 2] PONS Englisch-Deutsch. Übersetzung im Kontext von „jellyfish“ in Englisch-Deutsch von Reverso Context: Stop being such a spineless jellyfish.
Jellyfish Deutsch Jellyfish Facts and Information VideoSeven Pounds jellyfish scene
As they move the Jellyfish has a natural defense mechanism. Any time they feel in danger or they come into contact with something their tentacles will sting.
This releases toxins into what they came into contact with. Many people are afraid of the Jellyfish and it has been rumored to be a vicious attacker in the waters.
They are naturally designed though to release toxins through the tentacles when they come into contact with something or someone. That toxin can cause pain, swelling, and illness for a human that just happened to be in the wrong place at the wrong time in the ocean.
The lifespan of a Jellyfish is quite remarkable. Jellyfish are becoming the next trend in ornamental aquariums and Jellyfish Art is the leader in supplying live jellyfish and their specialized aquariums and products.
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Free-swimming scyphozoan jellyfish occur in all oceans and include the familiar disk-shaped animals that are often found drifting along the shoreline.
Most live for only a few weeks, but some are known to survive a year or longer. The bodies of most range in size from about 2 to 40 cm 1 to 16 inches in diameter; some species are considerably larger, however, with diameters of up to 2 metres 6.
Scyphozoan medusae consist of almost 99 percent water as a result of the composition of the jelly that forms the bulk in nearly all species.
Most feed on copepods, fish larvae , and other small animals that they catch in their tentacles, which have stinging cells nematocysts.
Some, however, simply suspension feed, extracting minute animals and algae phytoplankton from the water. Like all cnidarians, their bodies are made up of two cellular layers, the ectoderm and the endoderm, between which lies the gelatinous mesoglea.
In jellyfish the transparent mesoglea layer is quite thick. The life cycle of free-swimming scyphozoan jellyfish typically consists of three stages.
A sessile polyp scyphistoma stage asexually buds off young medusae from its upper end, with each such ephyra growing into an adult.
The adults are either male or female, but in some species they change their sex as they age. In many species, normal fusion of egg and sperm results in an embryo that is brooded in the gut of the adult until it becomes a ciliated planula larva, but in some this development takes place in the sea.
After the planula larva leaves its parent, it lives for a time in the plankton and eventually attaches to a rock or other solid surface, where it grows into a new scyphistoma.
Such a life cycle characterizes the order Semaeostomeae , which contains some 50 species of mainly coastal-water jellyfish, several of which have very wide geographic ranges.
Included among these are members of the genera Aurelia and Chrysaora and the big red jellyfish, Tiburonia granrojo subfamily Tiburoniinae , one of only three species of jellyfish that lack tentacles.
The mesogloea is bordered by the epidermis on the outside and the gastrodermis on the inside. The edge of the bell is often divided into rounded lobes known as lappets , which allow the bell to flex.
In the gaps or niches between the lappets are dangling rudimentary sense organs known as rhopalia , and the margin of the bell often bears tentacles.
On the underside of the bell is the manubrium, a stalk-like structure hanging down from the centre, with the mouth, which also functions as the anus, at its tip.
There are often four oral arms connected to the manubrium, streaming away into the water below. This is subdivided by four thick septa into a central stomach and four gastric pockets.
The four pairs of gonads are attached to the septa, and close to them four septal funnels open to the exterior, perhaps supplying good oxygenation to the gonads.
Near the free edges of the septa, gastric filaments extend into the gastric cavity; these are armed with nematocysts and enzyme-producing cells and play a role in subduing and digesting the prey.
In some scyphozoans, the gastric cavity is joined to radial canals which branch extensively and may join a marginal ring canal. Cilia in these canals circulate the fluid in a regular direction.
The box jellyfish is largely similar in structure. It has a squarish, box-like bell. A short pedalium or stalk hangs from each of the four lower corners.
One or more long, slender tentacles are attached to each pedalium. In some species, a non-detachable bud known as a gonophore is formed that contains a gonad but is missing many other medusal features such as tentacles and rhopalia.
Most jellyfish do not have specialized systems for osmoregulation , respiration and circulation , and do not have a central nervous system.
Nematocysts, which deliver the sting, are located mostly on the tentacles; true jellyfish also have them around the mouth and stomach.
They have limited control over their movement, but can navigate with the pulsations of the bell-like body; some species are active swimmers most of the time, while others largely drift.
The rhopalial ganglia contain pacemaker neurones which control swimming rate and direction. In many species of jellyfish, the rhopalia include ocelli , light-sensitive organs able to tell light from dark.
These are generally pigment spot ocelli, which have some of their cells pigmented. The rhopalia are suspended on stalks with heavy crystals at one end, acting like gyroscopes to orient the eyes skyward.
Certain jellyfish look upward at the mangrove canopy while making a daily migration from mangrove swamps into the open lagoon, where they feed, and back again.
Each individual has 24 eyes , two of which are capable of seeing colour, and four parallel information processing areas that act in competition,  supposedly making them one of the few kinds of animal to have a degree view of its environment.
The smallest jellyfish are the peculiar creeping jellyfish in the genera Staurocladia and Eleutheria , which have bell disks from 0. They can reproduce asexually by fission splitting in half.
Other very small jellyfish, which have bells about one millimeter, are the hydromedusae of many species that have just been released from their parent polyps;  some of these live only a few minutes before shedding their gametes in the plankton and then dying, while others will grow in the plankton for weeks or months.
The hydromedusae Cladonema radiatum and Cladonema californicum are also very small, living for months, yet never growing beyond a few mm in bell height and diameter.
The lion's mane jellyfish , Cyanea capillata , was long-cited as the largest jellyfish, and arguably the longest animal in the world, with fine, thread-like tentacles that may extend up to Jellyfish have a complex life cycle which includes both sexual and asexual phases, with the medusa being the sexual stage in most instances.
Sperm fertilize eggs, which develop into larval planulae, become polyps, bud into ephyrae and then transform into adult medusae. In some species certain stages may be skipped.
Upon reaching adult size, jellyfish spawn regularly if there is a sufficient supply of food. In most species, spawning is controlled by light, with all individuals spawning at about the same time of day; in many instances this is at dawn or dusk.
In most cases, adults release sperm and eggs into the surrounding water, where the unprotected eggs are fertilized and develop into larvae.
In a few species, the sperm swim into the female's mouth, fertilizing the eggs within her body, where they remain during early development stages.
In moon jellies, the eggs lodge in pits on the oral arms, which form a temporary brood chamber for the developing planula larvae. The planula is a small larva covered with cilia.
When sufficiently developed, it settles onto a firm surface and develops into a polyp. The polyp generally consists of a small stalk topped by a mouth that is ringed by upward-facing tentacles.
The polyps resemble those of closely related anthozoans , such as sea anemones and corals. The jellyfish polyp may be sessile , living on the bottom, boat hulls or other substrates, or it may be free-floating or attached to tiny bits of free-living plankton  or rarely, fish   or other invertebrates.
Polyps may be solitary or colonial. The polyp stage may last for years. After an interval and stimulated by seasonal or hormonal changes, the polyp may begin reproducing asexually by budding and, in the Scyphozoa, is called a segmenting polyp, or a scyphistoma.
Budding produces more scyphistomae and also ephyrae. These deepen as the constriction sites migrate down the body, and separate segments known as ephyra detach.
These are free-swimming precursors of the adult medusa stage, which is the life stage that is typically identified as a jellyfish.
Limnomedusae polyps can asexually produce a creeping frustule larval form, which crawls away before developing into another polyp. Some hydromedusae reproduce by fission.
Little is known of the life histories of many jellyfish as the places on the seabed where the benthic forms of those species live have not been found.
However, an asexually reproducing strobila form can sometimes live for several years, producing new medusae ephyra larvae each year. An unusual species, Turritopsis dohrnii , formerly classified as Turritopsis nutricula ,  might be effectively immortal because of its ability under certain circumstances to transform from medusa back to the polyp stage, thereby escaping the death that typically awaits medusae post-reproduction if they have not otherwise been eaten by some other organism.
So far this reversal has been observed only in the laboratory. Using the moon jelly Aurelia aurita as an example, jellyfish have been shown to be the most energy efficient swimmers of all animals.
They pause between the contraction and expansion phases to create two vortex rings. Muscles are used for the contraction of the body, which creates the first vortex and pushes the animal forward, but the mesoglea is so elastic that the expansion is powered exclusively by relaxing the bell, which releases the energy stored from the contraction.
Meanwhile, the second vortex ring starts to spin faster, sucking water into the bell and pushing against the centre of the body, giving a secondary and "free" boost forward.
The mechanism, called passive energy recapture, only works in relatively small jellyfish moving at low speeds, allowing the animal to travel 30 percent farther on each swimming cycle.
Jellyfish achieved a 48 percent lower cost of transport food and oxygen intake versus energy spent in movement than other animals in similar studies.
One reason for this is that most of the gelatinous tissue of the bell is inactive, using no energy during swimming. Jellyfish are like other cnidarians generally carnivorous or parasitic ,  feeding on planktonic organisms, crustaceans, small fish, fish eggs and larvae, and other jellyfish, ingesting food and voiding undigested waste through the mouth.
They hunt passively using their tentacles as drift lines, or sink through the water with their tentacles spread widely; the tentacles, which contain nematocysts to stun or kill the prey , may then flex to help bring it to the mouth.
A few species such as Aglaura hemistoma are omnivorous, feeding on microplankton which is a mixture of zooplankton and phytoplankton microscopic plants such as dinoflagellates.
Other species of jellyfish are among the most common and important jellyfish predators. Sea anemones may eat jellyfish that drift into their range.
Other predators include tunas , sharks, swordfish , sea turtles and penguins. Once jellyfish have become dominant in an ecosystem, for example through overfishing which removes predators of jellyfish larvae, there may be no obvious way for the previous balance to be restored: they eat fish eggs and juvenile fish, and compete with fish for food, preventing fish stocks from recovering.
Some small fish are immune to the stings of the jellyfish and live among the tentacles, serving as bait in a fish trap; they are safe from potential predators and are able to share the fish caught by the jellyfish.
Jellyfish form large masses or blooms in certain environmental conditions of ocean currents , nutrients , sunshine, temperature, season, prey availability, reduced predation and oxygen concentration.
Currents collect jellyfish together, especially in years with unusually high populations. Jellyfish can detect marine currents and swim against the current to congregate in blooms.
Jellyfish may also benefit from saltier waters, as saltier waters contain more iodine , which is necessary for polyps to turn into jellyfish.
Rising sea temperatures caused by climate change may also contribute to jellyfish blooms, because many species of jellyfish are able to survive in warmer waters.
When the phytoplankton die, they may create dead zones , so called because they are ahypoxic low in oxygen. This in turn kills fish and other animals, but not jellyfish,  allowing them to bloom.
They reproduce rapidly; they prey upon many species, while few species prey on them; and they feed via touch rather than visually, so they can feed effectively at night and in turbid waters.
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