Theses and Dissertations


Name: Rowan, Martha

Degree: PhD

Chair: Claude E. Boyd


University: Auburn University

Location: Auburn, Alabama

Date: 2001

Pages: 174

Keywords: Channel catfish,water quality,phosphorous,effluent


A series of trials were conducted in earthen ponds in Auburn, Alabama to determine the effectiveness of several chemical amendments in the removal of phosphorus from channel cattish {Ictalurus punctatus) pond water. Gypsum (calcium sulfate) applied to catfish pond water to maintain total hardness above 200 mg/L resulted in lower mean concentrations (P<0.05) of total phosphorus (TP), chemical oxygen demand (COD), and phytoplankton biomass (as measured by concentrations of chlorophyll a). Gypsum applied to maintain hardness in pond water above 100 mg/L resulted in fewer water quality improvements, although mean COD concentrations and phytoplankton abundance (organisms/mL) were lower (P<0.05) than in the control. Repeated applications of alum (aluminum sulfate) at 15 mg/L or hydrated lime (calcium hydroxide) at 30 mg/L resulted in little long-term improvement in pond water quality. Drying and tilling of pond bottoms before ponds were filled and stocked reduced (P0.05). Application of alum at 50 mg/L to water remaining in catfish ponds immediately after seining for harvest did not result in greater (P>0.05) removal of nutrients and solids than did settling alone. Within four hours of seining in both alum treated and untreated ponds, there was removal of more than 85% of TSS, 72% of turbidity, and more than 40% of biochemical oxygen demand.

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