The general shape of comb jellyfish is spindle-shaped, radially symmetrical about the mouth-to-mouth axis.
Comb jellyfish are hermaphrodites, with two gonads and a female arranged symmetrically in each longitudinal gastric tube and symmetrically across the stomach plane.
When talking about the body of a jellyfish, things are actually quite simple. Compared to the vast majority of animals we are familiar with, jellyfish have a much simpler body structure. Jellyfish lack a brain, heart or bones, as well as every other vital organ that we humans possess. Jellyfish are members of the Cnidaria phylum – also known as Stinging Jellyfish, Stinging Prickly phylum or Stinging phylum.
Not only is it very simple in its physical structure, up to 98% of a jellyfish’s body is water (in addition to some other parts of the body). Jellyfish also have a mouth that takes in food and excretes it, as well as a stomach cavity, a rudimentary stomach.
The final element of its physical structure are the tentacles. Although they can vary greatly in length and number, they are generally the most important body part of the jellyfish. They are also the primary sense organs for these creatures, including providing vision.
Unlike humans, the eyes of most jellyfish are not concentrated in one organ; instead, vision is produced by a network of nerves and proteins called opsins.
Jellyfish reproduce by mating and also by asexual reproduction. Male and female jellyfish are clearly distinguished, although hermaphrodite jellyfish are also found.
The lifespan of a jellyfish is only a few hours to a few burials. However, there is a species of jellyfish that has been recorded to live up to 30 years.
Jellyfish are predators but passive. They eat crustaceans, plankton, fish eggs, small fish or even other jellyfish.
Jellyfish are also prey for a number of other predators such as sharks, tuna, swordfish, sea turtles and some species of salmon in the Pacific Ocean.
Jellyfish do not have a brain, heart, ears, head, legs or bones. Their skin is so thin that they can breathe through it.
Because they do not have a brain, jellyfish movements are limited, depending on ocean currents. Jellyfish also do not actively hunt for food but only wait for prey to encounter them. Tentacles are covered with special cells called Cnidoblasts, used for hunting and self-defense.
Basically, jellyfish operate without a heart. And the jellyfish’s digestive system is also very rudimentary.
A jellyfish’s main defense mechanism is to inject poison into its enemies, and its transparent body makes it easy for it to hide in the ocean.
Besides the harmful aspects, jellyfish is known to be a very delicious and nutritious ingredient in cooking and is very good for health thanks to the benefits it brings because inside jellyfish contains a lot of protein and minerals such as: B, Ca, and Fe in addition to vitamins such as B1, B2, Na are very good for health.
