Pelagia - Fearsome Jellyfish Mauve jellies move in droves, their nasty stings feared by swimmers.
Surface chlorophyll a concentration in the global ocean.
Phytoplankton bloom observed by the ocean color sensor MODIS onboard NASA satellite Terra in May 2010. The bloom spreads broadly in the North Atlantic from Iceland to the Bay of Biscay - Source : NASA's Earth Observatory (http:/earthobservatory.nasa.gov)
