The word “jellyfish” is often used to describe animals that are made of gelatinous materials. Some types of jellyfish sting (called medusae) and others do not (called a salp). When a huge amount of plants or animals show up suddenly, scientists call it a “bloom”. Jellyfish often bloom, which causes issues for fisheries and tourism. A common analogy used to describe the delicate way jellyfish pounce through the water likens the jelly’s movements to ‘a simple form of jet propulsion’.
Jellyfish have large appetites, including phytoplankton, copepods (zooplankton), larvae, and sometimes, even other jellyfish. When the jellyfish are moving in ‘blooms’, they will eat literally anything that’s in the water/in their way. A jellyfish has a simple digestive system with only one opening. Fun fact: jellyfish are made up of more than 95% water.
The expected life span of a jellyfish is one year, typically starting with a spring birth and growing into adulthood during summer. By the end of summer, the jellyfish’s delicate skin is quite damaged by the end of summer, causing problems, which ultimately lead to death. However, scientists recently discovered an “immortal” species of jellyfish, which reverts back to a larval state as it ages, causing “immortality”.
Though it is rare for a jellyfish to reproduce in captivity, it is not uncommon for jellyfish to reproduce in the wild. They are typically found in coastal waters of all zones, but mostly warm or tropical waters. They are even found in brackish water with as low a salt content as 0.6%. Their biomes are reefs, tropical coastal, and freshwater lakes. They are also found in both oceans and inshore seas. Jellyfish can withstand temperatures as low as -6 degrees Celsius and as high as 31 degrees Celsius.
Though jellyfish are wildly liked and eaten in countries all over the world, there are many organizations set up for the conservation of the jellyfish species. Jellyfish are slowly becoming extinct for many unknown reasons, but water pollution is one of the reasons, and so is “hobby killing”.
Jellyfish are the major non-polyp form of the phylum Cnidaria. They are typified as free-swimming marine animals consisting of a gelatinous umbrella-shaped bell and trailing tentacles. Their scientific name is Medusozoa, their rank is subphylum, and their classification (also phylum) is Cnidaria. Jellyfish have no brain, no blood, and a very limited nervous system, used only to catch and kill their prey or food. There is about 200 different species of True Jellyfish, including one species that is literally immortal.
For the conception of jellyfish, a male jellyfish releases his sperm into the water that surrounds him, and then the sperm swim into the mouth of a female jellyfish. The sperm then fertilize the female’s eggs and eventually form an embryo. The typical amount of baby jellyfish born from a single mother at one time varies on the species and type of jellyfish. Jellyfish have a difficult and complex life...