The shrimp-like euphausiid (upper) and the copepod occur in many kinds and often in great abundance. These two groups of planktonic animals are of greatest importance as food for larger animals, like fish, squid, or even whales. In the Antarctic, euphausiids are the principal food of the blue whale.

Image ID: fish7965, NOAA's Historic Fisheries Collection
Photo Date: 1969 circa
Credit: NOAA Central Library Historical Fisheries Collection; P. 27 of "Our Changing Fisheries" 1970 Centenary NMFS centenary volume

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