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Document Type

Thesis - University Access Only

Award Date

1998

Degree Name

Master of Science (MS)

Department

Wildlife and Fisheries Science

First Advisor

David W. Willis

Abstract

. White bass Morone chrysops compose a substantial portion of the total harvest of sport fishes in Lakes Oahe, Sharpe, Francis Case, and Lewis and Clark, but little is known about their population dynamics. Age-0 white bass catch per unit effort (CPUE) in standardized seine samples from 1983 to 1995 was correlated with environmental data to assess potential relations. Environmental parameters that were significantly (P<0.05) correlated with white bass CPUE varied among reservoirs. Long term trends were evaluated for adult white bass populations using standardized gill net samples in the four Missouri River reservoirs of Lake Oahe, Lake Sharpe, Lake Francis Case, and Lewis and Clark Lake. Relative abundance (catch per unit effort (CPUE)], stock density indices, and mean relative weight (Wr) among length categories were monitored. CPUE was higher and inconsistent among years in Lakes Oahe and Sharpe. However, CPUE was lower and more consistent in Lake Francis Case and Lewis and Clark Lake. Proportional stock density (PSD), relative stock density of preferred-length fish (RSD-P), and relative stock density of memorable-length fish (RSDM) were assessed for Lakes Oahe, Sharpe, and Francis Case. Stock density indices were not calculated for Lewis and Clark Lake due to low sample sizes. Most PSD values ranged from 60 to 100 within years among reservoirs. RSD-P and RSD-M values were highly variable among all years and reservoirs, with RSD-P values ranging from l to l 00 and RSD-M values from 0 to 64. Lake Oahe had the lowest and most consistent RSD-M values, which ranged from 0 to 7 over years. RSD-M was inversely related to CPUE when all reservoir data were combined (r=-0.502, P=0.003). Mean Wr varied from 65 to 120 among length categories and reservoirs; values for various categories ranged from 80 to 100. Mean Wr for quality to preferred-length white bass was less consistent in Lake Francis Case, ranging from 65 to 120. In conclusion, age-0 and adult white bass populations in the four Missouri River reservoirs appear to be functioning independently of one another.

Library of Congress Subject Headings

White bass--South Dakota
White bass--Missouri River
Fish populations--South Dakota
Fish populations--Missouri River

Description

Includes bibliographical references (pages 56-64)

Format

application/pdf

Number of Pages

131

Publisher

South Dakota State University

Rights

Copyright 1998 Denise Beck. All rights reserved.

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