4 Hours. Origin, evolution, and physical and chemical characteristics of lakes and streams. Structure and function of plant and animal communities and aquatic ecosystems: Limiting factors, nutrient cycles, and trophic dynamics. Water quality aspects of fish culture. Lectures, lab, and field. Note: No student may earn credit in both BIOL 4554 and BIOL 5554. Prerequisite: CHEM 1123, CHEM 1131, and BIOL 3524.