Abstract
Nannochloropsis is an ubiquitous genus, found in diverse aquatic environments including open ocean as well as fresh and brackish water. Recently, large-scale blooms occurred frequently along eutrophic coastal zone from the Bohai Sea to the northern Yellow Sea in China. The cell density reached 10(9) to 10(10)cells per liter during a bloom near Qinhuangdao, Hebei Province. The bloom forming species, a yellow-green microalgae was successfully isolated and cultivated in the laboratory. Microscopic observation indicated that the cells contained simple morphological characteristics with a diameter about 2 μm. Pigment analyses confirmed that the pigment composition of the newly isolated strain BDH02 was similar to that of Nannochloropsis granulata. Phylogenetic analyses of 18S rRNA gene, ITS, and rbcL gene indicated that the strain was closely related to N. granulata. This is the first record of a bloom caused by N. granulata in China.
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