Murray State Theses and Dissertations

Abstract

In large reservoirs such as Kentucky Lake, White Crappie Pomoxis annularis exhibit complex reproductive dynamics, including variable annual recruitment and frequent skipped or partial spawning events. This study investigates the energetic and environmental factors influencing spawning success in Jonathan Creek, a northern embayment of Kentucky Lake. Using a dual sampling approach, I combined citizen science angler-caught fish during the pre-spawn with trap netting in shallow spawning areas to capture crappie during the full reproductive cycle. Physiological, biometric, and egg analyses revealed that spawning success was driven more by pre-spawn energetic conditions than by the conditions during the spawn. Elevated water levels prior to spawning served as a physiological “primer”, enhancing vitellogenesis, fecundity and reproductive output. These effects were reflected in higher gonadosomatic index (GSI) peaks and more robust egg production during years with positive deviations from average reservoir water levels. Seasonal decline in relative weight indicated energetic tradeoffs, particularly in larger females. Ovary pigmentation and diameter proved useful for assessing spawning status, suggesting that late-season females with retained eggs were partial spawners entering atresia rather than skipped spawners. This integrated sampling framework offers predictive insights into year class strength and supports adaptive management strategies for reservoirs with variable hydrology.

Year manuscript completed

2025

Year degree awarded

2025

Author's Keywords

Crappie, Pomoxis, Kentucky Lake, Reproduction, Citizen Science

Degree Awarded

Master of Science

Department

Biology

College/School

Jesse D. Jones College of Science, Engineering and Technology

Thesis Advisor

Timothy W. Spier

Committee Member

Jessica B. Moon

Committee Member

Michael B. Flinn

Committee Member

Adam Martin

Document Type

Thesis

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