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When the jellyfish are swimming, the tentacles contract so they are about 150 mm (6 in) long and about 5 mm (0.20 in) in diameter; when they are hunting, the tentacles are thinner and extend to about 3 m (9.8 ft) long. The tentacles are covered with a high concentration of stinging cells called cnidocytes, which are activated by pressure and a ...
The process of producing dehydrated jellyfish typically includes the removal of the tentacles prior to drying, [6] [13] because the upper dome area of the marine animal is the part typically used for cooking. [10] Jellyfish deteriorate rapidly at room temperature so processing starts soon after they are caught.
These tentacles serve the purpose of hunting and gathering food, because — unlike many other species of jellyfish — the Crimson Jellyfish does not have any arms. The Crimson Jelly has approximately 120 tentacles which is significantly more than other members of the Turritopsis genus which range from 80 to 100 tentacles.
Once contact has been made, nematocysts on the tentacle fire into the prey, injecting poison which paralyzes the animal, and the tentacle itself coils around the prey. The tentacles then bring the prey into the mouth, where it is released and then digested. Just like salt water jellyfish they do have stinging cells.
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 36.5 m (119 ft 9 in) long (though most are nowhere near that large). [54] [55] They have a moderately painful, but rarely fatal, sting. [56]
The new species of jellyfish is considered “relatively large,” its body reaching just over 1 inch in height and its tentacles measuring over 2 inches in length, the study said.
During June and July, changes in the water salinity lead to the expatriation of larval stage jellyfish via the Tsushima strait. In 2005 the largest blooms were in late October. [5] It is noted that this species of jellyfish in six months can grow from the size of a grain of rice to greater than 6 ft (1.8 m) wide. [7]
Turritopsis dohrnii, also known as the immortal jellyfish, is a species of small, biologically immortal jellyfish [2] [3] found worldwide in temperate to tropic waters. It is one of the few known cases of animals capable of reverting completely to a sexually immature, colonial stage after having reached sexual maturity as a solitary individual.