what is the average lifespan of a jellyfish
The Medusa phase is the jellyfish form that we're familiar with. Jellyfish live an average of 3 - 6 months in the medusa phase, but could spend years in the polyp phase, with some never actually maturing into a an adult medusa.ellyfish live an average of 3 - 6 months in the medusa phase, but could spend years in the polyp phase, with some never actually maturing into a an adult medusa.