Apopulation explosion of dinoflagellates in the ocean that can occur during summer months is called a

Dinoflagellates are large group of flagellate eukaryotes (multicellular organisms) that constitute the group dinoflagellata. Red tides is a common name for alga bloom (large concentrations of aquatic microorganisms ) which when caused by a few species of dinoflagellate and the bloom takes on a red or brown color. Therefore, the answer to the question is red tides.