Evaluation of two methods for oxygenating hatchery water supplies
Fisheries Bioengineering Symposium: American Fisheries Society Symposium 10
Colt J;White RJ;
American Fisheries Society
Two methods for oxygenating hatchery water supplies were examined. A preliminary test of an oxygen absorption column was conducted to determine outflow concentrations of dissolved gases over a range of water (100-445 L/min) and oxygen gas (0.25-5.0 L/min) flows. The oxygen absorption column was 1.9 m long and 0.45 m in diameter. Water and oxygen gas were introduced in a countercurrent arrangement. As oxygen gas flow increased, dissolved oxygen in the outflow water increased from approximately 100 to 290%, while dissolved nitrogen declined from 102 to 60%; total gas pressure in outflow water varied from 101 to 108%. Oxygen was also introduced directly to a hatchery water supply line. At a constant water flow of 660 L/min and oxygen gas flows between 5 and 8 L/min, dissolved oxygen was increased from 68.6 to 224%, while dissolved nitrogen decreased from 108.4 to 85.0%. Both methods of oxygenation provided efficient means to increase dissolved oxygen and decrease dissolved nitrogen in hatchery water supplies. Long-term studies are required to examine the influence of hyperoxygenated water on blood physiology.