Helmet jelly (Periphylla periphylla) feeding.
Location: Trondheim Fjord
Periphylla periphylla is found in depths from about 1000 meters down to 7000 meters. During the night Periphylla migrates from between 60 and 200 meters they have been recorded in depths of only 2 meters. The main body of the Periphylla periphylla jellyfish can grown to 35cm with 12 tentacles growing to 50 cm in length. The Norwegian name for this jellyfish is kronemanet. The color varies from pale pink or orange to dark red. Scientists believe they are long-lived (30 years?). The maximum recorded depth is 2700 metres.