title: An improved system for the control of dissolved oxygen in freshwater aquaria.
abstract: A system for the removal and control of dissolved oxygen (DO) from freshwater was designed and constructed with aquarium-type fish studies in mind. Degassed water was obtained using a partial vacuum of -14 psi, and DO regulated at an aquarium scale using electronically controlled aeration with timed partial water renewal. The degassing system was capable of producing water with approximately 1.7 mg L(-1) DO within 10 min of operation, and 0.55 mg L(-1) after 2h. The control system was capable of maintaining DO levels of ca 0.8 mg L(-1) over 48 h in the absence of aeration and further capable of precisely controlling DO levels as low as 1.16+/-0.002 mg L(-1) (mean+/-SEM) with aeration over a 48 h period.
mesh_terms: D000818:Animals; D001331:Automation; D004867:Equipment Design; D005399:Fishes; D005618:Fresh Water; D010100:Oxygen / Q000032:analysis* / Q000737:chemistry; D012995:Solubility; D014618:Vacuum
chemical_list: D010100:Oxygen