White-spotted jellyfish feed primarily on zooplankton and can reach up to 50 centimetres in size. It is native to the West Pacific from Australia to Japan, but has been introduced widely elsewhere. Photo credit: The Deep, Hull
A species of the genus Aurelia, it is translucent and can be recognised by its four horseshoe-shaped gonads. Capable of only limited motion, it drifts with the current, even when swimming.