This article explores the phenomenon of jellyfish in Japan, discussing their types, effects on fisheries and aquaculture, how climate change has impacted their occurrence, and strategies for managing them. It mentions the most common species found in Japanese waters such as the Aurelia aurita (moon jellyfish) and Chrysaora pacifica (Pacific sea nettle), as well as other types like Nemopilema nomurai (Nomura’s jellyfish), Cyanea capillata (Lion’s mane jellyfish), Mastigias papua (Golden jellyfish), and Rhopilema esculentum (Edible jellyfish). It also looks at the positive and negative impacts that they can have on fisheries and aquaculture operations throughout Japan, as well as how climate change has led to more frequent occurrences of jellyfish blooms along Japanese coasts. Finally, it discusses strategies for managing their populations such as monitoring blooms using traditional methods