Blade Jellyfish Peter foerster

1) Name of your organism

Genus: Chrysaora herba

Species: Chrysaora

Common Name: Blade Jellyfish

2) In what zones of the ocean is your organism found? What are some of the abiotic factors in this zone?

The blade jellyfish is found only in one zone, the euphotic zone. The jelly spends the majority of its time in the euphotic zone. In the euphotic zone, the jelly will hunt its prey throughout most of its day. After the hunting, the blade jellyfish will rest for most of the night. Some abiotic factors in this zone include high sunlight, lots of oxygen, warm temperature, and low pressure.

3) What traits make your organism well-suited to live in this zone?

The euphotic zone is the ideal place of living for the blade jellyfish. It would be best to call it a utopia for blade jellyfish. In the zone, the jellyfish has all the abiotic factors which it needs. The jellyfish prefers warmer climates, most preferably temperatures which are between 104 and 25 degrees Fahrenheit. Any temperature out of range is dangerous for the jellyfish and may paralyze/kill it. Oxygen is needed for the jellyfish to survive. The blade jellyfish is different from other jellyfish because it has a respiratory system. It must live in areas with high concentrations of oxygen. The blade jellyfish also has a wide variety of animals to prey on in the zone.

4) How does your organism move?

The organism moves on its own. The blade jellyfish is not a free-floating zooplankton. It is classified as a nekton because of its ability to swim. A vital body part for the jellyfish's movement is it's bell. The bell is the head of the jelly. The bell is able to flap, enabling the jellyfish to skim through water. The jellyfish is able to move at speeds of 20 miles per hour.

5) How and what does your eat?

The blade jellyfish eats a wide variety of animals. The blade jellyfish will eat organisms that are less than four feet in length. The jelly most prefers the mullet to be their favorite. The blade jelly hunts by first chasing down the prey. The jelly next closes in on the enemy and stings it. The blade jellyfish is able to launch microscopic blades that paralyze and kill it's prey. Once the prey is weakened, the jelly will wrap it's tentacles around it and consume it. Below are fish which are most favorable for the jelly's diet.

Croaker Fish
Spot Fish

Atlantic Bonito
Mulltet Fish
Butter Fish

6) How big is your organism?

The blade jellyfish is relatively small, not too large. The jellyfish reaches a total length of 2 feet. The tentacles usually reach a foot in length. The bell of the jellyfish reaches a foot in length also. The jellyfish weighs a total of 5 pounds.

7) What color is your organism? Why does it have those colors?

The jellyfish has a blue color, best known as teal. It has no other color, it's pure teal. The color gives the blade jellyfish many advantages. The color of the jellyfish allows it to blend with the water. Blending with the water helps the jellyfish in hunting. It will be hard for the prey to notice the jellyfish and this is a key advantage in hunting. This specific color also is key in helping the jellyfish evade predators. The transparent blue color is hard for many organisms to notice.

8) How does the organism protect itself?

The blade jellyfish uses it's tentacles to protect itself. The tentacles contain an extremely toxic substance which can paralyze and kill an enemy. Their tentacles are called cnidocytes. The cnidocytes contain microscopic blades which can be fired to hit an enemy up to four feet in range. Once an enemy is hit, it could be stunned, paralyzed, or killed. The blade jellyfish can also attack by wrapping the venomous tentacles around the enemy.

Microscopic Venom Blades

9) Is your organism planktonic, nektonic, or benthic? Explain how it floats/swims/attaches/ whatever.

Many would expect a jellyfish to be benthic, but it isn't quite so with the blade jellyfish. The jellyfish is nektonic, it swims on its own. The bell of the jellyfish will flap, enabling it to move. The jellyfish is also very light (5 pounds), making it a very fast swimmer for its size. The blade jellyfish will reach a maximum of 20 miles per hour.

10) Describe the method/structures your organism uses to breathe.

Most jellyfish don't use cellular respiration, rather they dissolve oxygen. The blade jellyfish is quite an unusual jellyfish. The blade jellyfish uses cellular respiration to circulate oxygen throughout its body. The figure below shows the circulatory and respiratory system of the jellyfish. The circulation of blood allows different systems to function as well.

Blade Jellyfish lungs

11) Explain how your organism reproduces. Why does your organism reproduce this way?

The blade jellyfish reproduces in two ways. It uses asexual and sexual reproduction. During sexual reproduction, the male jellyfish will insert sperm into a female jellyfish's ovaries. The female jellyfish will carry the fertilized eggs for about a week and then lay them in sand. During this time, the male will find another female jellyfish and eventually die off. The fertilized eggs become larvae and eventually asexual reproduction takes place. One jelly will split to become another jellyfish. This type of reproduction is crucial and helps. With sexual reproduction, the eggs will have an advantage in being healthy. Asexual reproduction allows more offspring to hatch. More offspring makes competition easier.


Cutting Process

Step #1: Material (blue) is cut out and shaped.

Sewing Process

Step #2: Once cutting is done, sewing the material together takes place. The material is then merged together, but a little opening is left for the next step.

Stuffing Process

From the previous step I mentioned that I left a little opening. Why is that? The little opening was made to be able to stuff cotton inside of the material. Once the material was stuffed, the realistic shape was finally made. Next, the opened space had to be sewed back in.

Jellyfish Complete!

Every step has been finished, now the project is complete!

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