(all pictures on this page are of courtesy of Alexander Semenov)
         The Moon jelly is one of the most common jellyfish among others. It can be found in almost all shallow marine and coastal regions. The Moon jellyfish are not very good swimmers because of their short tentacles and, therefore, are sometimes found washed up on the shorelines. The map below shows the distribution of the Moon jelly around the world in the dotted regions. Notice how the Moon Jelly does not like to live in freezing cold waters, avoiding the Arctic Ocean, but are widely distributed because they can survive in waters varying from zero to thirty-one degrees Celsius.  The comfortable range for these jellies are from eight to nineteen degrees Celsius. Remember that these jellies don’t live in the deep portion of water due to the fact that its food source is usually located at the surface of the water and Moon Jellyfish relies on the current to pull them along.


Where the food goes.. I go!
         Like many other animals, jellyfish migrate in the direction that they can likely survive in. What helps you survive?  Food. Jellyfish will move in the direction of the greatest light because plankton moves in the direction of light and where there’s the prey the predator is not far behind. Jellyfish are usually seen popping up in the areas of water during the warm seasons and causing trouble to fishermen. (Dr. Bill Incatasciato, 2012) The moon jellyfish is a common jelly amongst many others and their impact on the fishing market is no surprise. Jellyfish can get tangled and damage nets that are put out by fishermen and decrease the amount of fish caught. A study supported by the JSPS and KSEF Core University Program on Fisheries Science (FiSCUP) and International Collaboration Research on Giant Jellyfish tried to determine the distribution and abundance of jellyfish in the summer of Japan by measuring out the sound speed, density, and target strength amongst three different types of Jellyfish, in which the Aurelia aurita is one of them. The results of these experiments were inconclusive because although all three of the jellyfish are from the same order (Semaeostomeae) there doesn’t seem to be any solid evidence to show a direct correlation between the acoustic characteristics of these jellyfish. According to Dr. Harlen the definition of acoustic scatter is “ultrasound spectroscopy and sonar rely on the scattering of sound waves at interfaces between different media”. These Scientists suggest that jellyfish may differ their sound waves by species and not order. Further experiments are needed to resolve the issue of figuring out the abundance and distribution of jellyfish. (Miyajima, Y.Y., et al. 2009)

Temperatures effect on asexual reproduction
           In 2012 an experiment published in the Journal of Experimental Marine Biology and Ecology shows that there's a correlation between the temperatures of the water and the food abundance directly affects the reproduction of the Moon Jelly. The planulae of wild moon jellies were used for this experiment and were placed into six different conditions food and water conditions. The six conditions consisted of three different temperature settings at 6 degrees Celsius, 12 degrees Celsius, and 18 degrees Celsius with alternating high and low supply of food. These experiments proved to be successful; four types of asexual budding were observed. The fully grown moon jellies  were found to reproduce by lateral budding, lateral budding by means of stolons, reproduction from parts of stolons/stalks, and longitudinal fission at the two higher temperature settings. The results of this experiment concluded that at higher temperatures with high food supply the planulae settles onto a hard substrate into its colonies faster and asexually reproduce more. Other experiments have been concluded that moon jellyfish do not asexually reproduce in reaction to harsh conditions, but with the abundance of food supply. Even if the moon jellyfish was enriched with food, but the food supply is low, they still wouldn’t asexually reproduce as often as they would if the supply was high. The theory is that at higher temperatures the planulae settles faster and therefore can start to grow; the increased supply of food causes growth of tentacles that aid in the consumption of food so, therefore food benefits those with more tentacles. At low temperatures the planulae is said to settle at a slower pace and if they don’t settle in an area after two weeks, they die. Therefore, temperature is a key factor in the settlement of the planulae and their survival. (Webster, Clare N., et al. 2012.)