Masters Theses

Date of Award

12-1996

Degree Type

Thesis

Degree Name

Master of Science

Major

Wildlife and Fisheries Science

Major Professor

J. Larry Wilson

Committee Members

David A. Etnier, Mike Smith

Abstract

SCUBA observations were used to evaluate the utilization of half-logs by naturally spawning smallmouth bass (Micropterus dolomieu). Of the 736 half-logs which were installed in Norris Reservoir in 1993, 22% of the total (161) logs were evaluated weekly at three different sites from 2 April 1996 and continuing through 25 June 1996. There were 88 line-transects, each 12.2 m in length, used as controls and positioned in non-structure areas; the transects were located at the same water depths as the half-log structures.

Species found utilizing the half-logs for spawning were smallmouth bass, bluegill (Lepomis macrochirus), black crappie (Pomoxis nigromaculatus), spotted bass (M. punctulatus), and largemouth bass (M. salmoides). Other fish species utilizing the half-logs for cover were flathead catfish (Pylodictis olivaris) and common carp (Cyprinus carpio). Treatment areas produced an average of 1.9 nests per log whereas the controls produced 0.8 nests/transect, indicating a strong preference for overhead cover for spawning. No smallmouth bass were observed nesting around any of the control transects. In the treatment areas all the nests with eggs (61) had a successful hatch. The mean depth at which smallmouth bass nests containing eggs were found was 3.1 m. Half-logs installed on points had a higher percentage utilization (45%) for spawning by smallmouth bass than those located in coves (10%).

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