This report is based upon data gathered from June, 1971 through October, 1972, as part of continuing studies initiated to determine the effects of heated water on aquatic resources of the White River at Petersburg, Indiana. The heated effluent is discharged into the river by an electric generating station. Emphasis was placed on the distribution and abundance of smaller fish and invertebrates. A primary concern was to determine if the heated water affected the food habits, external parasites, or reproduction of the fishes. Sampling was continued through the winter to determine effects of heated discharge during the colder parts of the year. Results showed that differences can be found between heated and unheated water. However, the differences are rather minor and it is not always clear that they relate to temperature. Some may relate to other habitat factors. Other than in the effluent canal itself, where populations of organisms are much depressed, no evidence of major harmful effects caused by heated water were found.

Bibliography: p. 101.