Chrysaora melanaster, commonly known as the northern sea nettle or brown jellyfish, is a species of jellyfish native to the northern Pacific Ocean and adjacent parts of the Arctic Ocean.

[1][2] Although jellyfish kept in public aquariums sometimes are referred to as C. melanaster, this is the result of the historical naming confusion and these actually are C.

[1] It dwells at depths of up to 100 meters, where it feeds on copepods, larvaceans, small fish, large zooplankton, and other jellies.

[7] Pollock can be both the food of the northern sea nettle and also the competitor for potentially limited sources of prey.

[8] The total biomass of the northern sea nettle has increased in recent years as climate change has caused a more stable and productive surface layer.