Theses and Dissertations


Title: The effects of three methods of aeration, of biofiltration and of aeration plus nutrient removal with water hyacinths on water quality in catfish ponds

Name: Pawaputanon, Oopatham

Degree: MS

Chair: Dr. E.W. Shell

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1972

Pages: 65

Keywords: Aeration,Biofiltration,Nutrient Removal,Water Hyacinths,Water Quality,Catfish.

Abstract:

The effects of three methods of aeration, of biofiltration and of aeration plus nutrient removal with water hyacinths on water quality in catfish ponds were investigated in 1/200-acre cement ponds. At the Fisheries Research Unit of the Auburn University Agricultural Experiment Station in 1971. Water was aerated by pumping over a series of splashboards, through a sprinkler and through a Venturi tube. In a fourth treatment, water was pumped over a gravel biofilter. In a fifth treatment, water hyacinths were placed in a pond being aerated with the Venturi air injection system. Each treatment was replicated in three ponds. Three ponds were used as controls. Fingerling channel catfish were stocked into each pond at a rate ranging from 240 to 320 lbs. per acre. Fish were fed six days per week except when the dissolved oxygen concentration was less than 3 ppm. Because of low oxygen, fish in control ponds could not be fed approximately 20 days during the experimental period. Fish in treatment ponds could not be fed approximately 4 days. Mean total production for the five treatments ranged from 5,753 to 6,827 lbs. per acre. Production in all treatment ponds was significantly higher than in control ponds (1,260 lbs. per acre). The primary reason for the better growth in treatment ponds was the increase of dissolved oxygen resulting from the treatments. Carbon dioxide was not as high in the control ponds as expected. It remained high in ponds with Venturi air injection plus hyacinths during the entire experimental period and existed for short periods in ponds receiving other treatments. The pH in ponds with Venturi air injection plus water hyacinths was significantly lower than for other treatments. Phosphate, nitrite and nitrate were high in ponds with Venturi air injection (no hyacinths). Ammonia was reduced by water hyacinths. There was a low level of phytoplankton in ponds with Venturi air injection plus hyacinths. The pattern of the twenty-four-hour dissolved oxygen profiles was the same in all treatments and in control. The lower reading was in early morning. The highest reading was during the afternoon and remained high several hours after sundown.

Download: Download

203 Swingle Hall | Auburn, Alabama 36849 | (334) 844-4786 |
Website Feedback | Privacy | Copyright ©