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Document Type

Thesis - University Access Only

Award Date

1989

Degree Name

Master of Science (MS)

Department

Wildlife and Fisheries Science

First Advisor

Charles G. Scalet

Keywords

walleyes, growth, eggs, population, south dakota, habitat

Abstract

Triploid induction experiments were conducted on fertilized walleye (Stizostedion vitreum) eggs in 1987 and 1988. Different methods and different heat-shock treatment regimes were used between years; either the water temperature, initiation time, or the duration of the heat shock were varied. In 1987, three replicates of four treatments were conducted: 3SoC-10 min after fertilization (MAF)-1. 0 min, 3SoC-10 MAF-2.0 min, 400C-10 MAF-1.5 min, and 120C-10 MAF-1.5 min (control treatment). The heat-shock treatments of 3SoC-10 MAF-2.0min and 400C-10 MAF-1.5 min were lethal to walleye eggs acclimated to 120C. Total percent hatch for the treatments of 380C-lo MAF-1. O min and 12oC-10 MAF-1.5 min was estimated to be 37.7% and 36.9%, respectively. Walleye fry from these two treatments were stocked into 0.1 hectare hatchery rearing ponds in an attempt to rear them to the fingerling size. No walleyes survived to a size that would allow blood sampling, therefore no triploid assessment was made. In 1988, six heat-shock treatments and three control treatments were conducted The water temperature of the heat shocks was 29oC or 31 CC, the initiation times were either 1, 3, or 5 MAF, and all heat shocks 1mted for 25 min. Control treatmen1s had the same initiation time and duration regimes, but the water temperature was I

Library of Congress Subject Headings

Walleye (Fish) -- Eggs
Walleye (Fish) -- Growth
Walleye (Fish) -- Identification
Flow cytometry

Description

Includes bibliographical references (page 59-66)

Format

application/pdf

Number of Pages

79

Publisher

South Dakota State University

Rights

Copyright © 1989 Rebecca Ewing

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