http://en.wikipedia.org/wiki/Jellyfish_Lake
The golden jellyfish migration pattern is as follows:The golden jellyfish rotate counterclockwise as they swim at the surface, presumably to provide even exposure to the sun for the symbiotic algae in their bodies.
- Night - For about 14 hours a day the jellyfish make repeated vertical excursions between the surface and the chemocline in the western basin possibly to acquire nutrients from near the chemocline for their symbiotic algae.
- From early morning to about 0930 - The jellyfish move from center of western basin to the eastern basin.
- From early afternoon to about 1530 - The jellyfish move from eastern basin to near western end of lake.
- As the sun sets - The jellyfish move briefly eastward from western end to western basin where they remain through the night.