Explanation:

It is green algae which is behind the scintillating phenomenon observed in oceans when they glow fluorescent blue at night.
The Noctiluca algae is often reported to occur in patches or blooms in the Northern Arabian Sea.
These striking green blooms often appear to glow at night due to a special phenomenon called bioluminescence, earning them the nickname ‘sea sparkle’.
An Indo-US study has found that global warming is leading to large-scale fish kills in the Arabian Sea by fuelling the growth of this harmful bioluminescent algae.
It is believed to be dangerous to ocean life because it produces ammonia. Their growing abundance is a cause of concern, because they adversely affect fish, which do not thrive in such waters