Aurelia aurita
"Aurelia aurita" lives in ocean water temperatures ranging from ; with optimum temperatures of . It prefers temperate seas with consistent currents. It has been found in waters with salinity as low as 6 parts per thousand.
The relation between summer hypoxia and moon jellyfish distribution is prominent during the summer months of July and August where temperatures are high and dissolved oxygen (DO) is low. Of the three environmental conditions tested, bottom DO has the most significant effect on moon jellyfish abundance. Moon jellyfish abundance is the highest when bottom dissolved oxygen concentration is lower than 2.0 mg L -1. Moon jellyfish show a strong tolerance to low DO conditions, which is why their population is still relatively high during the summer. Generally, hypoxia causes species to move from the oxygen depleted zone, but this is not the case for the moon jellyfish. Furthermore, bell contract rate, which indicates moon jellyfish feeding activity, remains constant although DO concentrations are lower than normal. During July and August it is observed that moon jellyfish aggregations of 250 individuals consumed an estimated 100% of the mesozooplankton biomass in the Seto Inland Sea. Other major fish predators that are also present in these coastal waters do not seem to show the same high tolerance to low DO concentrations that the moon jellyfish exhibit. The feeding and predatory performance of these fish significantly decreases when DO concentrations are so low. This allows for less competition between the moon jellyfish and other fish predators for zooplankton. Low DO concentrations in the coastal waters such as the Tokyo Bay in Japan and Seto Inland Sea prove to be advantageous for the moon jellyfish in terms of feeding, growth, and survival.
Lighthouse lizardfish
The lighthouse lizardfish is known to live in a marine environment within a depth range of about 2–100 meters. They are native to reef-associated locations within a tropical climate. The average length of the Synodus jaculum as an unsexed male is about 10 centimeters or 3.9 inches. The maximum recorded length of the Synodus jaculum as an unsexed male is about 20 centimeters or 7.87 inches. This species is identified by its brown colored body with the dark brown splotches. This species also has transparent fins. The lighthouse lizardfish is native to the areas of Indo-Pacific, East Africa, Marquesan, Society islands, north to the Izu Islands in Japan, south to New South Wales in Australia, Palau, and Kosrae in Micronesia. This species occupies coral reefs and it is found on sand or rubble near coral heads. This species of fish is caught and sold as fresh and salted in markets. It is also common to find this species isolated, in pairs, or in small groups.