Dawson, V. K., Johnson, D. A., and Sullivan, J. F., 1992, Effects of the lampricide
3-trifluoromethyl-4-nitrophenol on dissolved oxygen in aquatic systems: Great Lakes
Fishery Commission Technical Report, v. 57, p. 21-33.

Abstract

The effects of the lampricide 3-trifluoromethyl-4-nitrophenol (TFM) on dissolved
oxygen and other water- quality characteristics were evaluated in a series of test
chambers under selected combinations of water,  sediment, TFM, and exposure to
sunlight. Concentrations of TFM gradually decreased over time, especially in  the
presence of sediment and sunlight. The lampricide did not directly cause a reduction in
dissolved oxygen  concentration, but appeared to inhibit photosynthetic production of
oxygen during daylight. Dissolved oxygen  concentrations were significantly reduced
by the presence of TFM in chambers exposed to sunlight.  Concentrations of total
ammonia were significantly higher in chambers with sediment than in those without 
sediment. In chambers that contained river water and were exposed to sunlight,
ammonia concentrations were  low because of either oxidation by the elevated
dissolved oxygen concentrations or the assimilation of nutrients  by algae. The
observed changes in dissolved oxygen and ammonia because of the presence of TFM
were subtle,  but statistically significant.

Keywords

population-control, ichthyocides, toxicity-tests, water-quality, dissolved-oxygen,
ammonia, Petromyzontidae-