THE great importance of the small and microscopic animals and plants that drift throughout the water layers in the and constitute the ‘plankton’ is now well established. On the plankton plants, chiefly consisting of diatoms, most of the animal life in the sea is ultimately dependent for its food supply. It is therefore natural that in fishery investigations, when seeking the basal causes of fluctuations in supply of fish, much time should have been spent in a study of this drifting life.
"Plankton of the Offshore Waters of the Gulf of Maine”. By Henry B. Bigelow. Bulletin of the Bureau of Fisheries, vol. 40, 1924,: part 2, Document No. 968, pp. 1–509. Washington, 1926.