Development of a System for Controlling Dissolved-Oxygen Content of Water
- 1 July 1961
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 90 (3) , 323-327
- https://doi.org/10.1577/1548-8659(1961)90[323:doasfc]2.0.co;2
Abstract
A system for controlling the dissolved‐oxygen content of a continuous flow of water was developed and tested. It is essentially a continuous flow of water through a partial vacuum. Two daily adjustments maintain the dissolved‐oxygen content of the effluent water within 0.05 p.p.m. of the desired concentration. Minimum oxygen content of 0.5 p.p.m. and flow rates greater than 10 liters a minute were obtained. Modifications are suggested to improve the efficiency and capacity of this system. The behavior of four species of fish at reduced oxygen concentrations was observed. When the oxygen content was decreased below 3 p.p.m., ventilation rate and amplitude increased rapidly, activity decreased, normal colors faded, feeding ceased, and the fish became unresponsive to such stimuli as movement and vibration. Oxygen concentrations below 3 p.p.m. appear to be critical for these four species in resting conditions.This publication has 0 references indexed in Scilit: