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Two enclosures (diameter 40m; depth 6.20m) of plastic material have been anchored in the shallow and strongly eutrophic Lake Comabbio (Northern Italy). These isolate a water column from the surface to the lake bed of theoretical volume 7500 m3. One enclosure was continuously supplied with oxygen from the 15th of November to the 6th December 1986, the other kept as control. The experiment was carried out for 72 days (26th September - 9th December). The interactions among fish respiration, photosynthesis and oxygen supply are discussed. This treatment, in spite of the fish respiration and microbic and mineral oxygen consumption, increased the oxygen concentration in the whole water column of 2 mg/l in comparison with the concentration in the control.

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Authors: RAVERA O, JRC Ispra (IT);RICCARDI N, JRC Ispra (IT);SECHI P, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Terzo Congresso Nazionale della Società Italiana di Ecologia, Siena (IT), Oct. 21-24, 1987 Extract: Atti de Terzo Congresso Nazionale della Società Italiana di Ecologia (1989) pp. 1077-1078, Edizione Zara, Parma (IT)
Availability: Available from (1) as Paper IT 33661 ORA
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