Abstract
ing fresh-water fish populations; but to date the emphasis largely has been upon lakes, ponds, and upon trout streams or small warm-water streams. Relatively little attention has been given to larger rivers, partly because they present greater difficulties. To the fishery manager, estimation of the fish population of a given body of water is fascinating, because it both satisfies his scientific curiosity and challenges his resourcefulness, and it is useful since it provides an inventory of stock on hand.
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