... det-rimental to desired fish populations. The key to controlling thermal pollution” is a firm understanding of how tempera-ture affects fish, and of the circumstances that truly consti-tute ... 1146 THERMAL EFFECTS ON FISH ECOLOGY Of all environmental factors that influence aquatic organ-isms, temperature is the most all-pervasive. There is always an environmental temperature ... Francis Group, LLC THERMAL EFFECTS ON FISH ECOLOGY 1151 24. Parker, F.L. and P.A. Krenkel, 1969b, Thermal pollution: Status of the art, Dept. of Envir. and Water Res. Eng., Vanderbilt Univ. Rept....