Image of a blue algae bloom near Hong Kong shoreline . The non-toxic phytoplankton is not considered harmful and is relatively common in Hong Kong . Commonly known as ` ` Sea Sparkle , '' the algae is not in itself potentially harmful . However , the bloom is a sign of a troubled ecosystem , marine scientists say .
Image of a blue algae bloom near Hong Kong shoreline . Commonly known as ` ` Sea Sparkle , '' the algae is not in itself potentially harmful . However , the bloom is a sign of a troubled ecosystem , marine scientists say .