Last update: November 12th, 2019 at 11:00 am
When sunlight is plentiful in the southern latitudes, spirals of plankton like these are common in the Indian Ocean. But the plankton also require nutrients to bloom, which is why plankton is more typically found closer to the coast than in the open ocean. In this case, strong currents seem to have carried the nutrients out further from the coast than normal.
Source: NASA Earth Observatory