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![The three-celled counting chamber was designed to fulfill a specific need in the study of variations in the distribution of very small zooplankters fish5558.jpg The three-celled counting chamber was designed to fulfill a specific need in the study of variations in the distribution of very small zooplankters](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish5558.jpg?itok=2woJ4ogz)
Description
The three-celled counting chamber was designed to fulfill a specific need in the study of variations in the distribution of very small zooplankters. This needwas to be able to describe the mechanisms underlying the distribution andmovements of sardines, it was necessary to precisely determine the distributionof their food which consist primarily of small zooplankters. (Image credit: NOAA Central Library Historical Fisheries Collection)