The Fascinating World Of Jellyfish
Their tentacles, which reach up to 100 feet long in some species, are covered with cells called nematocysts that fire tiny poison harpoons, enabling the animals to immobilize krill, larval fish and other prey without risking their mushy bodies in a struggle.
In addition, this robotic platform could also be used as a scientific tool to further study the behaviors of ephyrae due to its various advantages, such as the ability to change the locomotion mode on demand and not being influenced by physiological factors 52 , 53 Ephyrae hold a critical position in ocean ecological system due to their large quantity and wide distribution 54 Although many previous researches have studied ephyrae's most typical swimming kinematics 23 , 25 , 26 , 27 , 28 , 29 , the impacts of changing the morphology and kinematics of the ephyrae to their survivability and habitat, which can happen when the environment is affected by pollutants 31 , 32 , 33 , ion concentration change 34 , and temperature variation 24 , remains to be further investigated using such tool as a future work.
There are about 10,000 cnidarian species, roughly half of which are anthozoans (a family that includes corals and sea anemones); the other half are scyphozoans, cubozoans, and hydrozoans (what most people refer to when they use the word "jellyfish").
Compared with fish, jellies are better feeders, better growers, more tolerant of all kinds of things,” she told me, adding of the marine environment: I think it's entirely possible we've made things better for jellyfish.” Part of her likes the idea of unruly jellies causing a commotion and foiling our plans.
Marker shapes illustrate the type of aquatic robot, from biological soft robots such as the medusoid and robotic ray made from rat cardiomyocytes seeded on silicon scaffolds ( 9 , 10 ) to purely mechanical robots, including bioinspired robots ( 3 , 7 , 33 , 34 ) and an AUV ( 35 ). Marker colors illustrate the type of propulsion, including medusan (jellyfish swimming), thunniform (fish swimming), rajiform (ray swimming), and propeller-driven (AUVs).
Other species, like upside-down jellies (Cassiopea species) and Australian Spotted gallumboverde (Phyllorhiza punctata), have symbiotic relationships with algae (zooxanthellae), and they obtain enough carbohydrates from them to not need additional food sources.
Small marine arthropods that do manage to escape the crenulated drapes of the lion's mane will undoubtedly get tangled in the sensory tentacles that trail up to four metres behind the bell—although the tentacles of the Arctic species of lion's mane can be as long as 30 metres.