The Productivity of Lakes

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Abstract
Factors which render a lake productive of fish are briefly considered. It is suggested that the rooted aquatic plants play an important role because they (1) absorb salts from the soil and add them to the water on decay; (2) add organic compounds to the water; (3) contribute to the organic detritus; (4) provide places of attachment for immense quantities of algae; (5) provide places of attachment for the animal eggs; (6) serve as forage plants for some animals; (7) provide hiding-places for fish; (8) tend to hold the soil of the bottom, including the organic detritus, in place. A review of literature supporting this view is presented, and the investigation of this contention, by practical quantitative studies of rooted aquatic vegetation and fish, is advocated.

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