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![Fertile areas of the ocean swarm with hundreds and hundreds of millions ofanimal plankton fish7966.jpg Fertile areas of the ocean swarm with hundreds and hundreds of millions ofanimal plankton](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish7966.jpg?itok=6CITwWGO)
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Fertile areas of the ocean swarm with hundreds and hundreds of millions ofanimal plankton. Some are visible as small dustlike particles; others can beseen only with a microscope. The living zooplankton shown here contain twokinds of copepods - animals shaped like grains of rice - and one kind of arrowworm - the long slender animals at upper right and lower left. (Image credit: NOAA Central Library Historical Fisheries Collection; P. 25 of Our Changing Fisheries 1970 Centenary NMFS centenary volume)