Jellyfish

A:

A jellyfish's body is made up mainly of water, along with a jelly-like substance called mesoglea, tentacles, a mouth and a thin layer of skin. Its body is around 90 percent water and its skin is only one cell thick.

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  • How are jellyfish scientifically classified?

    Q: How are jellyfish scientifically classified?

    A: Jellyfish are animals of the phylum Cnidaria, class Scyphozoa, order Semaeostomeae and family Cyaneidae. The phylum Cnidaria is an incredibly ancient group of invertebrate animals, stretching back hundreds of millions of years. Jellyfish are among the oldest types of multicellular animals. True jellyfish have a number of distinguishing characteristics by which they are classified.
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  • How do jellyfish swim?

    Q: How do jellyfish swim?

    A: Jellyfish swim by opening and closing a part of their body called the bell, which is the transparent, sack like part of their body that the tentacles hang from. The bell catches water when it opens and ejects it when it closes, propelling the jellyfish forward.
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  • What is the jellyfish's habitat?

    Q: What is the jellyfish's habitat?

    A: Jellyfish are found in all of the Earth's oceans, including the very deep sea, as well as shallow saltwater lakes. Various jellyfish species have a wide range of living preferences, with some preferring arctic waters, and others preferring warmer tropical waters. There are animals called hydrozoans that are closely related to jellyfish and live in freshwater lakes.
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  • What are some predators of the jellyfish?

    Q: What are some predators of the jellyfish?

    A: Some predators of the jellyfish include other jellyfish, sunfish, some sea turtles and humans. Occasionally birds and other fish will bite around the non-venomous inner tissue of the jellyfish, dodging the outer tentacles altogether.
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  • Are jellyfish carnivores, herbivores or omnivores?

    Q: Are jellyfish carnivores, herbivores or omnivores?

    A: Jellyfish are carnivores and excellent predators. They sting with tentacles to subdue small aquatic fish, and eat the eggs and invertebrates that stick to their tentacles.
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  • What is a red jellyfish?

    Q: What is a red jellyfish?

    A: The red jellyfish, Tiburonia granrojo, is a large, predatory species of jellyfish living deep in the Pacific Ocean. Dark red in color, it grows to 2 to 3 feet in diameter and has a fleshy appearance.
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  • What kinds of food do jellyfish eat?

    Q: What kinds of food do jellyfish eat?

    A: Jellyfish are opportunistic carnivores that will eat almost anything they come across. Smaller jellyfish consume plankton, larger ones eat fish eggs, crustaceans and snails, and the very largest jellyfish can catch and eat whole fish. Jellyfish can also be cannibalistic.
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  • Where do box jellyfish live?

    Q: Where do box jellyfish live?

    A: According to National Geographic, box jellyfish, also called sea wasps, live off the coastal waters of Northern Australia and throughout the Indo-Pacific. Box jellyfish also are frequently found off the coasts of Vietnam, Hawaii and the Philippines.
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  • Can you get a pet jellyfish for kids?

    Q: Can you get a pet jellyfish for kids?

    A: Non-poisonous jellyfish, such as Moon jellyfish and Blue Blubber jellyfish, are widely available and appropriate as pets for children. Pet jellyfish for kids require a special aquarium and fish-specific diets.
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  • How does a jellyfish move?

    Q: How does a jellyfish move?

    A: Jellyfish move by floating with the ocean's currents, jet propulsion or by using cilia. Jellyfish typically move deep in the water, though some move in shallow water. Man-o'-wars float on top of the water.
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  • What are the body parts of a jellyfish?

    Q: What are the body parts of a jellyfish?

    A: A jellyfish's body is made up mainly of water, along with a jelly-like substance called mesoglea, tentacles, a mouth and a thin layer of skin. Its body is around 90 percent water and its skin is only one cell thick.
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  • What do moon jellyfish eat?

    Q: What do moon jellyfish eat?

    A: Moon jellyfish primarily eat planktonic crustaceans, but they also eat other small plankton including molluscs, fish eggs and smaller jellyfish. They catch their food with sticky mucus that lines the underside of their bells and then direct it into their four stomach pouches with their tentacles.
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  • What are jellyfish made of?

    Q: What are jellyfish made of?

    A: Jellyfish are made of 95 percent water and 5 percent solid matter. The solid matter is composed of three layers: the epidermis is the outer layer, the mesoglea or the jelly is the middle layer and the gastrodermis is the inner layer.
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  • Q: Where do blue bottle jellyfish live?

    A: The blue bottle jellyfish lives in tropical waters in the Indian Ocean and the Caribbean Sea and off the entire coast of Australia. The jellies float near the surface of the water and often wash up onshore.
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  • Q: Is there a clear jellyfish species?

    A: Many species of jellyfish are transparent or partially transparent. The bell-shaped body of the jellyfish is filled with a gelatinous substance that is mostly water. With no skeleton and few specialized internal organs, there is very little to prevent light from passing through a jellyfish's body.
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  • Q: What eats jellyfish?

    A: Creatures that eat jellyfish include tuna, sharks and sea turtles such as the leatherback and the hawksbill. These animals eat jellyfish despite their prey's stinging tentacles. Jellyfish also eat each other.
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  • Q: Where does the cabbage head jellyfish live?

    A: The cabbage-head jellyfish, more commonly known as the cannonball jellyfish, lives in warm, temperate estuary waters around the world. They are commonly found along the North American Atlantic seaboard, but also live in areas of the Pacific.
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  • Q: What are characteristics of jellyfish?

    A: Jellyfish are free-swimming marine animals composed of more than 95 percent water, with bodies consisting of an umbrella-shaped bell and trailing tentacles. Jellyfish are radially symmetrical with a central axis through the length of their bodies. As a result, they have a top and bottom, but no left or right sides, as do most animals whose bodies are bilaterally symmetrical.
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  • Q: How many babies do jellyfish have?

    A: Jellyfish release thousands of larvae that settle on the ocean floor and turn into polyps that become baby jellyfish. Male jellyfish release sperm into the water and the sperm either fertilizes eggs that the female releases into the water or enter through the female's mouth and fertilize her eggs.
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  • Q: What is the niche of jellyfish?

    A: The ecological niche of jellyfish has remained largely unchanged for more than 600 million years. Jellyfish are carnivorous and live on plankton, small crustaceans, fish eggs, fish and other jellyfish. In turn, they are preyed on by tuna, sharks, sea turtles, swordfish and salmon.
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  • How many tentacles does a jellyfish have?

    Q: How many tentacles does a jellyfish have?

    A: A jellyfish may have from eight to hundreds of tentacles depending on its species. Jellyfish tentacles also vary greatly in size, from a few feet to over a hundred feet in length.
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