More energy storage molecules accessible to moon jellies allows them to reproduce more, resulting in more births. Fewer deaths would also enhance the jelly population. The number of sea turtles and moon jelly consumers has reduced. Moon jellies and other jellies, according to scientists, thrive in locations that are severely impacted by human activities. Overfishing, ocean warming, and pollution are all variables that diminish the predators and competitors of moon jellyfish while increasing their prey.
The moon jelly population decrease could have been caused by the decrease of food. There could have been an increase of competition for the food, making it harder for the jellies to survive on the dwindling food supply, which could have been caused by a population increase of the species the moon jellies pray on.