It is carnivorous, feeding on small prey that it catches using the long stinging tentacles around the edge of its umbrella. Its mouth, located under the umbrella, is extended by four long, scalloped lobes: its oral arms.
This jellyfish multiplies at an alarming rate in the Pacific, where it competes for food with other marine species, namely those used by fisheries.
The northern sea nettle can grow to up to 30 cm in diameter with 6 m long tentacles.
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