Jellyfish 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 (the amount
Atolla jellyfish the “alarm jelly”. It is believed that the purpose of these flashes is to attract a bigger predator than the one that was currently attacking it (Herring 2004). It is an attempt to scare the predator that is currently attacking it with a larger predator that could possibly prey on the predator attacking it. There has been evidence that "Atolla wyvillei" is threatened by shrimp (Moore,1993). A close relative of "Atolla" species, the crown jellyfish is eaten as a delicacy in Japan (Seaunseen, 2014). Atolla jellyfish Atolla wyvillei, also known as the Atolla jellyfish or Coronate medusa, is a species