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confetti sea

Posted by
daniela scharnowski (Berlin, Germany) on 5 January 2011 in Animal & Insect and Portfolio.

Sea Nettle: Chrysaora melanaster
The largest jellyfish of the Arctic
Size
* bell upto 60cm
* tentacles and lips may stretch more than 3 m

Color & Characteristics
* Color: white, brown to orange stripes
* 24-32 long orange-red tentacles
* 4 long curtain-like lips
* 8 marginal rhophilia (sense organ), spaced between 32 lappets
* 16 dark brown/black radiating streaks on subumbrella between 8 stomach pouches
* tentacles can produce a nasty sting to humans

Habitat
* Epiplegic (surface waters) to ~100 m depth
* Nertic (shelves) and over basins
* Commonly observed by divers or ROVs, its abundance to and size make it rare to capture in plankton nets
* Benthic form has not been observed in the Arctic, suggesting the species may be seasonally imported from the subarctic

Feeding
* Diet includes copepods, larvaceans, other jellies, larger zooplankton and small fish

Life cycle
* An obligate benthic phase, that strobulates (buds) to release ephra larvae
* larvae mature into adult body-form that releases eggs and sperm
* Fertilized eggs settle to seafloor to prooduce a small non-colonial benthic form
* Life span in Arctic unknown, possibly only one season
[http://www.arcodiv.org/watercolumn/cnidarian/Chrysaora_melanaster.html]
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The ones we have at the Berlin aquarium have bells only about 15cm.

PENTAX K-x 1/30 second F/5.6 ISO 1600 43 mm

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PENTAX K-x
1/30 second
F/5.6
ISO 1600
43 mm

jellyfish
aquarium
2011
animal