Tag oxygen

A new study indicates the ocean is losing oxygen due to climate change, greatly affecting fisheries and other marine resources. 

Aerators, especially paddlewheels, are often used to mix the water and address oxygen stratification in ponds. However, most aerators do not provide the most efficient and power-conscious service. Due to thermal and oxygen stratification in ponds, the efficiency of paddlewheel aerators is low, and other present-day aerators have other problems. Emerging designs should better address effective mixing and aerating of pond water. 

Traditional sea cage culture typically relies on natural water exchange to replace oxygen consumed by fish, which may not provide sufficient oxygen – especially during seasonal periods of high temperature. 

Although carbon dioxide is not highly toxic, high levels in the blood have many negative physiological consequences. As carbon dioxide increases, higher dissolved oxygen tension is necessary to load hemoglobin with oxygen. 

Biofloc systems enable more intensive tilapia production. The fish adapt to the conditions within biofloc systems and grow well by utilizing the bioflocs as a feed source. 

The split-pond culture system offers several advantages over traditional fish ponds. Aerating the small fish-confinement area is more effective at maintaining adequate levels of dissolved oxygen than in traditional ponds. 

Although essential, emergency backup systems do not have to be complicated or expensive. For power loss, automated phone dialers alert off-site staff. Backup electric generators provide needed power for aerators, pumps and other equipment. 

Due to the inherent complexities of field testing, definitive laboratory-based test methods can better quantify probiotic benefits. 

Speece cones are capable of providing high concentrations of dissolved oxygen or ozone for water used in aquatic systems. High pressure within the cone systems diffuses the oxygen or ozone into the water as it flows downward through the inverted cone shape of the units. 

Ozone is a strong oxidizing agent that effectively removes colors, odors and turbidity from water, and kills bacteria, viruses and other microorganisms. 

As stocking density increases in aquaculture systems, supplemental oxygen becomes necessary. Oxygen generation is becoming a popular option. 

In studies that compared performance of channel catfish hatcheries, eggs hatched six hours sooner with lower-oxygen incubation, but experienced lower survival.