Robert E. Wollitz

Apparently extensive fish mortalities were reported to have occurred in the North Fork Pound Reservoir during February, 1969 and February, 1970. A study was initiated in September, 1969 and continued through October, 1970, in order to ascertain the causes of these mortalities. Chemical water analyses disclosed that the lake pH varied from 4.0-6.4, with a mean near 5.0. The heavy metals, copper, mercury, zinc, iron and manganese were found in the lake waters at levels reported to have chronic effects on fish. Biological investigations revealed fish populations were at low levels (...

Hidden Valley Lake is an acid water, shallow trout impoundment located in southwest Virginia at an elevation of approximately 3,600 feet above sea level. Renovation of the dam and outlet structures and fish management procedures are discussed. Subsurface water temperatures and dissolved oxygen values were obtained during the summers of 1965 and 1966. These are discussed in relation to an aeration system installed during the fall of 1965. No definite conclusions concerning beneficial effects on the fishery were arrived at; although dissolved oxygen in bottom waters was higher during...