JELLYFISHJellyfish belong to the family of phylum Cnidaria, which includes Hydras, polyps, jellyfishes, sea anemones and corals. While some like corals, are fixed and grow attached to rocks, jellyfish is mobile. Since jellyfish is not actually a fish, many people consider the name to be misleading and thus use jellies or sea jellies instead.
A group of jellyfish is sometimes called a bloom or a swarm. "Bloom" is usually used for a large group of jellyfish that gather in a small area, but may also have a time component, referring to seasonal increases, or numbers beyond what was expected. Jellyfish are "bloomy" by nature of their life cycles, being produced by their benthic polyps usually in the spring when sunshine and plankton increase, so they appear rather suddenly and often in large numbers, even when an ecosystem is in balance. Using "swarm" implies some kind of active ability to stay together, which a few species like Aurelia, the moon jelly, demonstrate.
Jellyfish invokes mixed reaction from beach goers. Its unusual appearance is amusing and fascinating to look at. However, the trouble it causes to those who encounter it is immense. It varies from mild to fatal stings.
A group of jellyfish is sometimes called a bloom or a swarm. "Bloom" is usually used for a large group of jellyfish that gather in a small area, but may also have a time component, referring to seasonal increases, or numbers beyond what was expected. Jellyfish are "bloomy" by nature of their life cycles, being produced by their benthic polyps usually in the spring when sunshine and plankton increase, so they appear rather suddenly and often in large numbers, even when an ecosystem is in balance. Using "swarm" implies some kind of active ability to stay together, which a few species like Aurelia, the moon jelly, demonstrate.
Jellyfish invokes mixed reaction from beach goers. Its unusual appearance is amusing and fascinating to look at. However, the trouble it causes to those who encounter it is immense. It varies from mild to fatal stings.
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