Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School

Wildlife Management


An aquatic environment involves many complex relationships biologically, physically, and chemically. Many of these relationships are difficult to measure or are little understood. In nature, aquatic environments accommodate many types of aquatic life. Ecological disturbances may cause the environment to become unfit for economically important forms of life. Human interferences often causes polluted waters and naturally occurring disturbances are common. A disturbance of this kind is one of the major problems of fisheries management in the northern Great Plains area – seasonal anaerobosis of fish or other aquatic animals and plants, commonly known as winter kill. Winter kill is usually a result of dissolved oxygen depletion in the water, although under certain conditions lethal agents may cause death. The basic causes involved in winter kill are known, but many limnological relationships remain unsolved. There have been very few studies on winter conditions of lakes in relation to winter kill. Due to the many questionable or unknown factors relating to winter kill and the major problem in fisheries management it creates, this study was undertaken to gain a better understanding of the winter-kill phenomenon.

Library of Congress Subject Headings

Freshwater fishes


Includes bibliographical references (pages 50-52)



Number of Pages



South Dakota State University


No Copyright - Non-Commercial Use Only