KEITH B. GIDO AND WILLIAM J. MATTHEWS, Department of Zoology, University of Oklahoma, Norman, Oklahoma 73069, USA

North American reservoirs are relatively new ecosystems that have established artificial assemblages of both native and introduced fish. Because of the artificial nature of these ecosystems, the long-term stability of the fish assemblage is uncertain. To evaluate the stability of the fish community in the Red River arm of Lake Texoma, we conducted an intensive gill net survey between 1981-1984 and began this survey again in January 1995. Multivariate analyses were used to characterize the variation in the fish assemblage over this time period. In addition, relationships of species abundance with abiotic conditions (e.g., water level, turbidity) were examined. We found considerable seasonal variation in the abundance of Morone saxatilis and Aplodinotus grunniens while Dorosoma petenense showed high annual variation. Overall, the fish community of Lake Texoma appeared to be relatively stable, regardless of high annual variability in water levels and turbidity.