Joining up with Marcy over at Ben & Me for “Blogging through the Alphabet” and super excited to do so!
Since our family has a general love and appreciation for all the animals the Lord has created…I am going to attempt to “Blog through the Alphabet” using animals. Here is what we have done so far:
And now…J is for Jellyfish…
Jellyfish belong to the Phylum Cnidaria.
There are about 200 species of True Jellyfishes (belonging to the Class Scyphozoa). Only 70 can truly harm a human.
Jellyfish are found in every ocean of the world. They are even found in some freshwater lakes and ponds.
They range from the size of the eraser tip of pencil to approximately 8 feet in diameter and tentacles that reach 200 feet.
Jellyfish are made up of over 95% water!
They do not have a skeletal structure or shell.
Jellyfish do not have gills so technically they are not fishes but just sea jellies.
The growth of a jelly fish NEVER stops.
Some jellyfish are clear, but others are in vibrant colors such as pink, yellow, blue, and purple, and often are luminescent.
They are delicate and easily damaged.
Jellyfish eat and poop through their mouth. (YUCK!)
They eat many different types of things: small plants, copepods, fish eggs and other small fish; they also eat the planktonic eggs and young stages of many different kinds of marine animals. Some jellyfish even eat other jellyfish!
They have a top and a bottom but they do not have a left or a right.
They have no brain, no blood and no nervous system.
They can sometimes be found in a “bloom” which is a large group of them.
To move forward, they take water into their muscular bell and then squirt it out behind them, creating a jet of water that propels the jelly forward. They also drift on water currents to move.
Their bodies consist of three layers: The outer layer is called the epidermis, the inner layer which lines the gastrovascular cavity is called the gastrodermis, and the middle layer consists of a thick substance called the mesoglea.
Depending on the size and type of jellyfish, it can live anywhere from a few days to about a year.
Reproduction: The most familiar stage is the medusa stage, where the jelly usually swims around and has tentacles hanging down. Male and female medusae reproduce and form thousands of very small larvae calledplanulae. The larvae then settle on the bottom of the ocean on rocks and oyster shells and form a smallpolyp that looks just like a tiny sea anemone. Each polyp will bud off many baby jellyfish called ephyrae that grow very quickly into adult medusae.
Jellyfish stings can be painful to humans and sometimes very dangerous. But jellyfish don’t purposely attack humans. Most stings occur when people accidentally touch a jellyfish, but if the sting is from a dangerous species, it can be deadly.
A jellyfish tentacle can still sting even if it is separated from the its body.
I hope you have learned some fun things about the Jellyfish! Come back next week to see what interesting animal we discuss for K!
Here’s praying we all have fun learning!