Fertile areas of the ocean swarm with hundreds and hundreds of millions of animal plankton

Fertile areas of the ocean swarm with hundreds and hundreds of millions of animal plankton. Some are visible as small dustlike particles; others can be seen only with a microscope. The living zooplankton shown here contain two kinds of copepods - animals shaped like grains of rice - and one kind of arrow worm - the long slender animals at upper right and lower left.

Photo Date: 1969 circa