Does a jellyfish poop?

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asked Jun 6, 2022 in Fish by Sopmod2 (660 points)
Does a jellyfish poop?

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answered Jun 9, 2022 by Wendell (41,840 points)
Jellyfish do poop although they don't poop out of an anus.

Jellyfish actually poop out of their mouth which is the same place where they take in food.

Jellyfish expel waste through the same hole where they take in food.

Jellyfish are more colorful and fascinating to look at than flatworms, but they are similar in their excretion of waste.

Most animals have two holes, one for a mouth and one for an anus.

Not so with these mysterious creatures!

The first animals that arose seem to have literally had potty mouths: Their modern-day descendants, such as sea sponges, sea anemones, and jellyfish, all lack an anus and must eat and excrete through the same hole.

Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria.

Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are anchored to the seabed by stalks rather than being mobile.

The bell can pulsate to provide propulsion for highly efficient locomotion.

Box jellyfish, named for their body shape, have tentacles covered in biological booby traps known as nematocysts - tiny darts loaded with poison.

People and animals unfortunate enough to be injected with this poison may experience paralysis, cardiac arrest, and even death, all within a few minutes of being stung.

Lacking brains, blood, or even hearts, jellyfish are pretty simple critters.

They are composed of three layers: an outer layer, called the epidermis; a middle layer made of a thick, elastic, jelly-like substance called mesoglea; and an inner layer, called the gastrodermis.

Some interesting facts about Jellyfish are.

Some jellyfish can glow in the dark.
Jellyfish are the oldest multi-organ animal.
Jellyfish are found all over the world.
Some jellyfish are immortal.
Not all jellyfish have tentacles.
There's a giant jellyfish called the hair jelly.
150 million people are stung by jellyfish each year.

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