Why did the moon jelly population has exploded in the Glacier sea?(why is there a lot of moon jellies in the Glacier sea?)

To reproduce, organisms need to release energy from energy storage molecules. If there are more energy storage molecules available to the moon jellies, they can reproduce more, resulting in more births. Fewer deaths would also cause the jelly population to increase.

Explanation:

In the past, jelly populations were kept in check by predators like sea turtles and jelly-eating fish. Due to the reduction of these predators, jelly populations are growing at alarming rates.