No Sting Jellyfish on Kakaban Island

there are at least four types of jellyfish found in this lake, the most we can find is the type of Mastigias papua, besides that there is also a clear colored jellyfish (Aurelia aurita) which is almost invisible, even when photographed it looks faint by other jellyfish, besides that there is also a cute type of Tripedalia cystophora and a type of Cassiopeia or which is unique by swimming upside down.