Abstract
THE production rate, or rate of growth, of aquatic organisms is one of the foremost problems of limnology. For a particular animal population, the rate of production can be measured by the difference between the rate of growth and the rate of mortality of the individuals making up the population. Considerable attention has been given to fish populations in this respect, and methods for determining the vital statistics of the populations have been developed (Ricker, 1948) and are being continually improved. The production rate of fish populations can now be computed if the necessary data are furnished. The rate of production of fish populations is influenced by a wide variety of factors, such as the amount of basic mineral nutrients present in the water, the degree of light penetration, the amount of predation, and the presence of parasites and disease organisms. Of major importance is the relationship between the population and its food sup-
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