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Toxic Substances in Discharges of Hypolimnetic Waters from a Seasonally Stratified Impoundment

Published online by Cambridge University Press:  24 August 2009

George Bret Oglesby ,
W. C. Noell ,
H. O. Delo ,
W. A. Dyer ,
R. H. England ,
J. R. Fatora ,
J. M. Grizzle  and
Stuart J. Deutsch
W. C. Noell
Affiliation:
Environmental Protection Division, State of Georgia Department of Natural Resources, 270 Washington Street S.W., Atlanta, Georgia 30334, U.S.A.
H. O. Delo
Affiliation:
Game and Fish Division, State of Georgia Department of Natural Resources, 270 Washington Street S.W., Atlanta, Georgia 30334, U.S.A.
W. A. Dyer
Affiliation:
Game and Fish Division, State of Georgia Department of Natural Resources, 270 Washington Street S.W., Atlanta, Georgia 30334, U.S.A.
R. H. England
Affiliation:
Game and Fish Division, State of Georgia Department of Natural Resources, 270 Washington Street S.W., Atlanta, Georgia 30334, U.S.A.
J. R. Fatora
Affiliation:
Game and Fish Division, State of Georgia Department of Natural Resources, 270 Washington Street S.W., Atlanta, Georgia 30334, U.S.A.
J. M. Grizzle
Affiliation:
Department of Fisheries and Allied Aquaculture, Auburn University, Auburn, Alabama 36830, U.S.A.
Stuart J. Deutsch
Affiliation:
School of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, U.S.A.
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Extract

A massive fish-kill at a trout hatchery located below the discharge of a seasonally stratified impoundment provided a unique opportunity to examine mechanisms of toxicity (using in situ water) by means of a largescale experiment at the hatchery itself. In order to assess the relative impact on the fish of a number of water constituents such as heavy-metals and organic materials, a variety of dosing chemicals were employed within the hatchery. Fish tissue and blood samples were collected for histological and chemical analysis, respectively.

It was concluded that a combination of manganese and organic material (probably humic in nature) in reduced chemical states in discharges of bottom (hypolimnetic) waters of the impoundment during periods of minimum power-generation was responsible for the mortality. Parallels between the fish-kill under investigation and other reported causes of hypolimnetic water toxicity were also drawn. It would appear that the redox state and nature of organic materials present may control the mechanisms in the various fish-kill situations. Implications for other users of the water are currently under investigation in an expanded programme.

Type
Main Papers
Information
Environmental Conservation , Volume 5 , Issue 4 , Winter 1978 , pp. 287 - 293
Copyright
Copyright © Foundation for Environmental Conservation 1978

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