When will the blue tears in Shitang appear?

According to the data of Fuzhou local treasure, "blue tears" generally appear in summer every year (especially in the exchange season between spring and summer), mostly from April to August, usually after 7 pm. The temperature of "blue tears" should be suitable (the water temperature is about 20 degrees, which is also one of the conditions for noctiluca to appear easily), and it is best to choose a sunny night. Blue tears will be washed ashore by the waves at high tide and low tide, so it is the best time to watch blue tears at high tide at night.

Nocturnal algae "blue tears" appear earlier than fireflies every year, mainly living in seawater and staying on the beach after low tide. Nocturnal algae is a marine genus of dinoflagellate, which is nearly spherical, with a diameter of 150 ~ 2000 microns and is nontoxic. When noctilucent algae accumulate in large quantities, it can be found that the seawater is pink during the day and blue at night, which often appears in early April. Patches of blue light are one of the wonders of the ocean, and its fluorescent bands appear not only on the beach, but also on the sea.