Red tide, also known as red tide. Red tide is a natural ecological phenomenon that one or more kinds of micro phytoplankton, protozoa or bacteria in the ocean suddenly and rapidly proliferate or gather under certain environmental conditions, causing color change in a certain sea area for a period of time. Red tide is a marine biological disaster. Usually, the color of water body is red, yellow, green and brown due to the number and species of red tide organisms
According to the above definition, which of the followings is most likely to belong to red tide phenomenon
The phenomenon of water body turning blue has occurred many times in the middle reaches of the Yangtze River in China