Thesis (Ph. D.)--Ohio State University, 2002. / Title from first page of PDF file. Document formatted into pages; contains xix, 207 p. Includes abstract and vita. Advisor: Roy A. Stein, Dept. of Evolution, Ecology and Organismal Biology. Includes bibliographical references (p. 187-207).

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This study is another phase of the overall research program designed to furnish basic information for the management of East Texas lakes and has as its specific purpose the determination of the age and growth characteristics of two valuable species on these waters. The species to be considered are the black crappie, Pomoxis nigro-maculatus (Le Sueur) and the white crappie, Pomoxis annularis Rafinesque. Both species are highly regarded as food fish and have for many years offered recreational outlets for Texas fishermen.

This study is based upon information taken from stomach analysis of 302 black crappie and 561 white crappie; the following data will be presented: 1. Food of adults and fingerlings; 2. Diet variation in relation to food availability; 3. Seasonal variation of feeding habits; 4. Diet variation in relation to size of crappie. Collections were made from ten lakes located in North, East, Central, and South Texas.

White Crappie (Pomoxis annularis) and Black Crappie (P. nigromaculatus) are popular North American gamefish; however, frequent fluctuations in year class strength present a management challenge for recreational fisheries. Intensive aquaculture production has the potential to address this challenge through controlled hatchery reproduction for supplemental stocking, but further study is needed to refine and optimize techniques. Therefore, this study evaluated the effects of hormone injection timing on latency period and spawning success, examined effective cryopreservation techniques for black-stripe Black Crappie sperm (a preferred hatchery phenotype), and compared simulated spring duration on out-of-season spawning success. Latency period for White Crappie did not depend on the diel time of gonadotrophin-releasing hormone injection. Cryopreservation of black-stripe Black Crappie sperm and subsequent fertilization of White Crappie eggs was more effective using 5% dimethyl-sulfoxide than 10% methanol. A longer duration at final spring spawning conditions (3 vs. 2 weeks) increased egg fertilization in out-of-season spawning experiments.

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