There is increasing evidence that high concentrations of plankton are sometimes associated with mass mortality among marine animals (Taylor, 1917, see ref's pp. 14-16; Marchand, 1928; BrongersmaSanders, 1947; Gunter, et al., 1947).
Woodcock, Alfred H.. 1948. "Note concerning human respiratory irritation associated with high concentrations of plankton and mass mortality of marine organisms." Journal of Marine Research 7, (1). https://elischolar.library.yale.edu/journal_of_marine_research/650