Blue blubber jellyfish

These jellyfish vary in color, depending on which part of the world they are from. In some parts of the world they are known as the jelly blubber. They can vary from white to light blue and purple.  

The bell of the blue blubber jellyfish grows to approximately 30-45 cm (12-18 in) in width although they are usually slightly smaller. Bell colors range from a creamy white to a brown and blue color. The bell pulsates and is used to propel the jelly forwards. They have eight arms with tentacles that can also vary in color. Each of the eight arms have several small mouths that catch and transport food to the jelly's stomach.There is no mouth as such, rather there are numerous small openings on each arm. Food is passed through these openings to the stomach. The tentacles have stinging cells that can capture tiny crustaceans and small fish.

Its bell pulses in a distinctive, staccato-like rhythm.

The eight tentacles have large numbers of nematocysts or stinging cells on them. These are similar to a tube that has been pulled inside out into its self with a sharp point and has a mechanism to pump poison through the end of the point. These nematocysts are extremely small, about 0.001 mm in diameter. There is a trigger on the exterior of the tentacle and when this trigger is activated either chemically or physically the tube or tubule as it is known inverts its self. Pushing outwards and pushing the point into the prey, it then pumps poison up the tubule into the prey. This process of firing takes place in 700 nano seconds which is extremely fast and occurs with substantial pressure. In some species the point is able to penetrate the shell of small crustaceans.

The effect of the sting of the blue blubber jellyfish on humans is mild compared to some jellyfish.

 Usually the sting results in a slight redness around the area where the tentacles have touched, however some individuals may be more allergic than others. The area may be itchy for some time.