Document Type

Thesis - Open Access

Award Date

1982

Degree Name

Master of Science (MS)

Department

Wildlife and Fisheries Science

First Advisor

Charles G. Scalet

Abstract

The effectiveness of stocking rainbow trout (Salmo gairdneri) in 47 selected stock ponds in south-central South Dakota was analyzed in 1977 and 1978. Rainbow trout were captured in 31 (66.0%) ponds during the study. Twenty-five of the 31 ponds (80.6%) appeared to have excellent rainbow trout populations. Rainbow trout stocked in ponds with a resident largemouth bass (Micropterus salmoides) population had poor survival. The growth rates and condition factors for 93 and 463 rainbow trout in 1977 and 1978, respectively, were excellent. The average total length for age-groups I and II rainbow trout in 1977 was 195 and 224 mm, respectively. The values for age-groups I, II, III, and V rainbow trout in 1978 were 184, 290, 366, and 499 mm, respectively. The average coefficient of condition value for all rainbow trout in 1977 was 1.04 and 1.07 for all trout in 1978. Stomachs were removed from 463 rainbow trout in 1978. Hemipterans and gastropods were the dominant food organisms eaten. Other organisms frequently consumed were coleopterans, dipterans, odonates, and cyprinids. Odonates and cyprinids were more frequently consumed by larger trout. The maximum surface temperatures recorded were 26.0 C in 1977 and 28.5 C in 1978. All ponds contained water with temperatures and dissolved oxygen levels within the reported tolerance ranges of rainbow trout. Several ponds, however, contained marginal levels and may have been responsible for our failure to capture rainbow trout in 16 ponds.

Library of Congress Subject Headings

Rainbow trout -- Growth
Rainbow trout -- Food
Fish stocking -- South Dakota
Farm Ponds -- South Dakota
Fishes -- South Dakota

Description

Includes bibliographical references (pages 43-51)

Format

application/pdf

Number of Pages

88

Publisher

South Dakota State University

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