guardians of the sea: japanese sea nettles

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You are looking at magnificent Japanese sea nettles that reside at the Vancouver Aquarium — a non-profit society dedicated to the conservation of aquatic life. Japanese sea nettles are a type of jelly, an invertebrate made up mostly of water. Jellies have no heart, brain or bones. They swim by jet propulsion, the jelly will expand then quickly contract its bell-shaped body, which forces water away from the bell and pushes the jelly in the opposite direction.

  • grant: $54,000 - Vancouver Aquarium Marine Science Centre

    To affect the conservation of aquatic life through display and interpretation, education, research, and direct action.

  • topic: jellyfish

  • location: vancouver

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guardians of the sea: japanese sea nettles

You are looking at magnificent Japanese sea nettles that reside at the Vancouver Aquarium — a non-profit society dedicated to the conservation of aquatic life. Japanese sea nettles are a type of jelly, an invertebrate made up mostly of water. Jellies have no heart, brain or bones. They swim by jet propulsion, the jelly will expand then quickly contract its bell-shaped body, which forces water away from the bell and pushes the jelly in the opposite direction.

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location: Vancouver, BC

best viewing hours: 24/7

time zone: Pacific Time

related links: Questions & Answers

did you know?

Jellies are invertebrates belonging to the phylum Cnidaria. Though many of the animals in this phylum such as sea anemones produce a jelly as part of their life cycle, there are only about 200 species of large jellies that people are likely to notice.

did you know?

A jelly is an invertebrate made up of 96% water, and has no heart, brain or bones.

did you know?

Jellies live in all the world's oceans.

did you know?

Jellies swim by jet propulsion: it expands then quickly contracts its bell-shaped body, which forces water away from the bell and pushes the jelly in the opposite direction.

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Jellies don't have complex eyes although some species have eyespots, which are light-sensitive spots on the rim of their bells called ocelli.

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Jellies have sensory organs statocysts that help maintain the jelly's balance. When a jelly tips too far to one side, the statocyst stimulates nerve endings that cause muscles to contract, turning the jelly right side up.

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Jellies are drifters and can't hide from predators, but some are transparent which conceals them from hungry leatherback sea turtles and ocean sunfish.

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Jellies have specialized stinging cells, called cniodocytes. Each of these cells contains a nematocyst which acts like a mini-harpoon. When a jelly touches something the nematocyst is released and injects toxin into the prey.

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Moon jellies range along both coasts of North America. While swimming you may encounter masses of them (called smacks) drifting with the current near the beach. Their sting will not kill you unless you are allergic to the toxin. It will probably feel tingly, but some say they don't feel anything when stung.

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Jellies live in the polyp, or budding, stage for five years or more. During the medusa stage jellies may live for several months.

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The jellies at the Aquarium are fed a daily meal of larval brine shrimp enriched with fatty acids, as well as frozen copepods.

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A jelly can regenerate small amounts of tissue that has been damaged.

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Australia’s box jelly is the most dangerous jelly. It has a lethal toxin more potent than cobra venom. It can kill a person in minutes.

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Jellies have been in the Earth's oceans for over 650 million years; they were here before the dinosaurs.

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The largest jelly has a bell that can reach 2.4 metres across and tentacles that extend over half the length of a football field.

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Many people consider jellies a delicacy. They are dried and de-salted to provide a nutrient-rich, low fat, low-calorie meal. It could become the next diet-craze food.
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Related Links · Questions & Answers

You are looking at magnificent Japanese sea nettles that reside at the Vancouver Aquarium — a non-profit society dedicated to the conservation of aquatic life. Japanese sea nettles are a type of jelly, an invertebrate made up mostly of water. Jellies have no heart, brain or bones. They swim by jet propulsion, the jelly will expand then quickly contract its bell-shaped body, which forces water away from the bell and pushes the jelly in the opposite direction.

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