Document Type

Thesis - Open Access

Award Date

1977

Degree Name

Master of Science (MS)

Department

Wildlife and Fisheries Science

Abstract

The food habits, food selectivity, growth, condition, and population structures of the white crappies (Pomoxis annularis) and black crappies (P. nigromaculatus) in Lake Poinsett, South Dakota, were studied from May, 1975, to May, 1976. The total food volume of 173 adult white crappies consisted of 59.0% plankton1o crustaceans, 25.2 % insects, 14.5 % fish, and 1.3 % miscellaneous organisms. The food volume of 39 adult black crappies consisted of 39.0 % planktonic crustaceans, 3.5 % insects, 57.8 % fish, and 0.7 % miscellaneous organisms. Both species selected Daphnia pulex over other zooplankton and probably contributed to its decline from 193.8/l on June 27 to 0.0/1 on August 21. Both species preyed indiscriminately on forage fish. Growth rates were comparable to those found in similar temperate lakes. The growth rates of the crappies increased while their population densities declined. The population decline appeared to be due to a lack of spawning habitat caused by low water levels.

Library of Congress Subject Headings

Crappie
Fish populations -- South Dakota
Lake Poinsett (S.D.)

Description

Includes bibliographical references (pages 42-44)

Format

application/pdf

Number of Pages

51

Publisher

South Dakota State University

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