Marking, L. L., Dawson, V. K., and Crowther, J. R., 1983, Comparison of column
aerators and a vacuum degasser for treating supersaturated culture water: The
Progressive Fish-Culturist, v. 45, no. 2, p. 81-83.

Abstract:

Supersaturation of nitrogen gas in water is a common problem in fish culture; mild
cases cause stress and  severe incidence cause gas bubble disease. Numerous
techniques have been proposed for the elimination of  excess gas. A vacuum
degasser, a column aerator, and a combination of the two aeration systems were
evaluated  for treating supersaturated well water. The degasser, the column aerator,
and the combined systems effectively  reduced nitrogen gas from about 133% to
near 100% of saturation. However, the vacuum degasser also  decreased the
dissolved oxygen from 27 to 22% of saturation, whereas the column aerators
increased the oxygen  level to over 91% of saturation.

Keywords:

aquaculture-equipment, water-treatment, supersaturation, degassing,
dissolved-oxygen, fish-culture