Why Dalians beach glows blue at night

Sea of Stars
Pinpricks of light on the shore seem to mirror stars above in an
undated picture taken on Vaadhoo Island in the Maldives.
The biological light, or bioluminescence, in the waves is the
product of marine microbes called phytoplankton—and now
scientists think they know how some of these life-forms create
their brilliant blue glow.

Various species of phytoplankton are known to bioluminesce, and
their lights can be seen in oceans all around the world, said marine
biologist and bioluminescence expert Woodland Hastings of
Harvard University.
"I've been across the Atlantic and Pacific, and I've never seen a
spot that wasn't bioluminescent or a night that [bioluminescence]
couldn't be seen," Hastings said.
The most common type of marine bioluminescence is generated by
phytoplankton known as dinoflagellates. A recent study co-
authored by Hastings has for the first time identified a special
channel in the dinoflagellate cell membrane that responds to
electrical signals—offering a potential mechanism for how the
algae create their unique illumination.