Upside-down jellyfish

Upside-down jellyfish

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Credit: ANDREW J. MARTINEZ/SCIENCE PHOTO LIBRARY

Caption: Upside-down jellyfish (Cassiopeia xamachana). This jellyfish swims upside-down as it contains symbiotic algae in its tentacles. When inverted like this, the algae are exposed to the maximum amount of light. The algae produce oxygen, which allows the jellyfish to live in oxygen-poor waters. Although the algae make much of the food this jellyfish needs, it does also take small fish and shrimp. Its tentacles are covered in stinging cells (nematocysts) that inject poison into anything that touches them. The poison is not strong enough to harm a human. This jellyfish inhabits Caribbean Sea. Photographed off Bonaire Island, Netherlands Antilles.

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Keywords: algae, animal, atlantic, bonaire, caribbean, cassiopeia xamachana, cnidarian, coelenterate, horizontal, invertebrate, invertebrates, inverted, island, jellyfish, marine, nature, netherland antilles, ocean, sea, symbiosis, tropical, underwater, upside-down, wildlife, zoology

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