Jellyfish primarily eat plankton, which are organisms that lack the strength and size to swim and therefore drift in marine and freshwater currents. Larger species of jellyfish also eat crustaceans, fish and other jellyfish. Jellyfish are carnivorous and primarily feed on animals. Some jellyfish have tissue containing symbiotic algae, which enables them to receive energy through photosynthesis.Know More
Jellyfish have simple bodies with a mouth in the center and trailing tentacles. They have no bones, brain or heart. Their tentacles are covered by cells that shoot out harpoons that puncture their prey and release a neurotoxin. These dart-like harpoons and stinging venom cause paralysis, which enables the jellyfish to capture their prey and also functions as a defense mechanism.
Despite their name, jellyfish are considered plankton rather than fish. Some jellyfish grow to 7 feet long with 100-foot tentacles, whereas small jellyfish can measure only an inch long. Jellyfish are ancient creatures that have lived in the oceans around the world for at least 650 million years. Most jellyfish are transparent and have pulsating, bell-shaped gelatinous bodies and trailing tentacles. There are thousands of different jellyfish species, most of which are ocean dwelling. While jellyfish can kill small sea creatures, their sting typically causes only temporary pain, fever and muscle cramps in humans.Learn more about Jellyfish
Most species of jellyfish live for less than one year. Some smaller species may only live for a few days. However, a type of jellyfish called Turritopsis is technically immortal, as it can age backwards into a polyp form and then produce hundreds of genetically identical adult forms.Full Answer >
There is a species of jellyfish that theoretically live forever; it is called the Turritopsis dohrnii. It lives in the Mediterranean Sea and around the waters of Japan.Full Answer >
Jellyfish are animals of the phylum Cnidaria, class Scyphozoa, order Semaeostomeae and family Cyaneidae. The phylum Cnidaria is an incredibly ancient group of invertebrate animals, stretching back hundreds of millions of years. Jellyfish are among the oldest types of multicellular animals. True jellyfish have a number of distinguishing characteristics by which they are classified.Full Answer >
Jellyfish are made of 95 percent water and 5 percent solid matter. The solid matter is composed of three layers: the epidermis is the outer layer, the mesoglea or the jelly is the middle layer and the gastrodermis is the inner layer.Full Answer >