The nettle passes though two different body forms during its life cycle. The most familiar form is the medusa, while the smaller form is the larval stage. Jellyfish are either male or female. A few steps are required in order for a jellyfish to reproduce. First, the reproductive organs in the male (the gonads) develop in the lining of the gut. Second, the male releases sperm through its mouth column. Third, the sperm has to swim into the mouth of the ...

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Sea nettle, Sea nettle - Life cycle and reproduction, Sea nettle - Habitat, Sea nettle - Feeding Habits, Sea nettle - Defense Mechanisms, Sea nettle - Sting Treatment

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Most jellyfish pass through two different body forms during their life cycle. The first is the polyp stage; in this phase, the jellyfish takes the form of either a sessile stalk which catches passing food, or a similar free-floating configuration. The polyp's mouth and tentacles are located anteriorly, facing upwards. In the second stage, the jellyfish is known as a medusa. Medusae have a radially symmetric, umbrella-shaped shaped body called a bell. The medusa's tentacles hang from the border of ...

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Jellyfish, Jellyfish - Life cycle and reproduction, Jellyfish - Defense and feeding mechanisms, Jellyfish - Body systems, Jellyfish - Blooms and grouping, Jellyfish - Jellyfish in captivity, Jellyfish - Cuisine, Jellyfish - Treatment of stings

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Jellyfish have two major body forms throughout their life. The first form is called the polyp stage and is characterized by either a non-moving (sessile) stalk that catches food drifting by or a similar form that is free-floating. Their mouth and tentacles are located anteriorly, facing upwards. The second form looks like a saucer and is called the medusa stage. It is characterized by a round (radially symmetric) dome-shape body plan with food-catching tentacles hanging down. It is this form which is most able to respond to and interact with its environment and is also the form with which people are most fa ...

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Jellyfish, Jellyfish - Detailed description, Jellyfish - Treatment of stings, Jellyfish - Freshwater jellyfish, Jellyfish - Cuisine

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When stung by a jellyfish, first aid may be in order. Though most jellyfish stings are not deadly, other stings, such as those perpetrated by the box jellyfish (Chironex fleckeri) — the most venomous marine creature and possibly the most venomous of any creature on earth — may be fatal. Serious stings may cause anaphylaxis and eventual paralyzation, and hence people stung by jellyfish must get out of the water to avoid drowning. In these serious cases, advanced professional care must be sought. This care may include administration of an antivenin and other supportive care such as requ ...

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Jellyfish, Jellyfish - Life cycle and reproduction, Jellyfish - Defense and feeding mechanisms, Jellyfish - Body systems, Jellyfish - Blooms and grouping, Jellyfish - Jellyfish in captivity, Jellyfish - Cuisine, Jellyfish - Treatment of stings

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See text Nettle (Urtica) is a genus of flowering plants in the family Urticaceae, mostly perennial herbs but some are annual and a few are shrubby. The most prominent member of the genus is the Stinging nettle Urtica dioica, native to Europe, Asia, and North America. The genus also contains a number of other species with similar properties, listed below. However, a large number of species names that will be encountered in this genus in the older literature (about 100 species have been described) are now recognised as synonyms of Urtica dioica. Some of t ...

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• Nettle - Uses
• Nettle - Safety

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Jellyfish are commonly displayed in a aquaria across the United States and in other countries; among the more known are the Monterey Bay Aquarium, Vancouver Aquarium, and Maui Ocean Center. Often the tank's background is blue with the animals illuminated by side lighting to produce a high contrast effect. In natural conditions, many of the jellies are so transparent that they can be almost impossible to see. Holding jellies in captivity also presents other problems: for one, they are not adapted to closed spaces or areas with walls, w ...

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Jellyfish, Jellyfish - Life cycle and reproduction, Jellyfish - Defense and feeding mechanisms, Jellyfish - Body systems, Jellyfish - Blooms and grouping, Jellyfish - Jellyfish in captivity, Jellyfish - Cuisine, Jellyfish - Treatment of stings

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The jellyfish can detect the touch of other animals using a nervous system called a "nerve net", which is located in its epidermis. Impulses to these nerve cells are sent from nerve rings that have collected information from the environment of the jellyfish through the rhopalial lappet, which is located around the animal's body. Jellyfish also have ocelli that cannot form images, but are sensitive to light; the jellyfish can use these to determine up from down, basing its judgement on sun ...

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Jellyfish, Jellyfish - Life cycle and reproduction, Jellyfish - Defense and feeding mechanisms, Jellyfish - Body systems, Jellyfish - Blooms and grouping, Jellyfish - Jellyfish in captivity, Jellyfish - Cuisine, Jellyfish - Treatment of stings

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When stung by a jellyfish, a little first aid is in order. The goal in first aid is to prevent nematocysts further discharging their venom and reduction of the harmful effects of the venom. If the sting is serious get out of the water immediately to avoid drowning. The first step is to carefully remove any attached tentacles from the skin as they continue to discharge venom. Clothing, sand, towels, and seaweed are all effective for this purpose. Secondly vinegar is recommended to neutralize any nematocysts that haven't discharged into the sk ...

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Jellyfish, Jellyfish - Detailed description, Jellyfish - Treatment of stings, Jellyfish - Freshwater jellyfish, Jellyfish - Cuisine

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Craspedacusta sowerbyi is known as the freshwater jellyfish. This hydromedusan species, which is not a jellyfish but a polyp, can be found in slow moving freshwater bodies all around the world. While it normaly breeds asexually which causes large collonies of same gender, in the summer, and a very hot summer near englands'longtitude, it changes into a moving creature which looks lik ...

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Jellyfish, Jellyfish - Detailed description, Jellyfish - Treatment of stings, Jellyfish - Freshwater jellyfish, Jellyfish - Cuisine

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Most jellyfish have tentacles or oral arms coated with thousands of microscopic nematocysts; generally, each of these nematocyst has a "trigger" (cnidocil) paired with a capsule containing a coiled stinging filament, as well as barns on the exterior. Upon contact, the filament will swifly unwind, launch into the target, and inject toxins. It can then pull the victim into its mouth, if appropriate. Although most jellyfish are not perniciously dangerous to humans, a few are highly toxic, such as Cyanea capillata. The recently dis ...

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Jellyfish, Jellyfish - Life cycle and reproduction, Jellyfish - Defense and feeding mechanisms, Jellyfish - Body systems, Jellyfish - Blooms and grouping, Jellyfish - Jellyfish in captivity, Jellyfish - Cuisine, Jellyfish - Treatment of stings

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Nettle stems are a popular raw material used in small-scale papermaking. The tops of growing nettles are a popular cooked green in many areas, and are exceptionally high in protein. Some cooks throw away a first water to get rid of the formic acid, while others retain the water and cook the nettles straight. Nettle tops are sold in some farmers' markets and natural food stores. Nettle is believed to be a galactagogue and a clinical trial has shown that the juice is diuretic in patients ...

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Nettle, Nettle - Uses, Nettle - Safety

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