Nitrification rates in fluidized-bed filters
Study evaluates nitrification rates of three fluidized-bed filters, finding no significant changes in fluidization level as biofilm accumulated or was sheared off.
Denitrification by anaerobic bacteria can remove nitrates from RAS, but the operation requires anaerobic conditions and the addition of carbon sources.
Study evaluates nitrification rates of three fluidized-bed filters, finding no significant changes in fluidization level as biofilm accumulated or was sheared off.
Where aquaculture is key to food or employment, policies regarding effluent management should be flexible to address various species, systems and environments.
The ionic composition of inland well water can vary from suitable to toxic to cultured animals. Reliable data on concentrations of major cations (calcium, magnesium, potassium, and sodium) and major anions (bicarbonate, sulfate, and chloride) is therefore important in the management of waters for inland shrimp farming.
Water's ability to conduct electricity increases with the total concentration of dissolved ions. Measuring conductivity helps estimate salt content of water.
Partitioned aquaculture system for catfish and co-culture of tilapia can achieve catfish yields up to four times higher than conventional pond culture.
With increasing intensification of pond aquaculture, management of sediment like organic matter is becoming an important concern for pond managers.
Integrated aquaculture systems comprise large fish cultured intensively in cages and small fish cultured semi-intensively in the surrounding pond water.
Research in a culture system without water exchange indicated that biological performance of postlarvae was similar.
Adding nitrogen and phosphorus to natural waters can cause eutrophication. Discharge of these nutrients from aquaculture operations is under U.S. government evaluation.
In intensive shrimp-culture systems, sand, sediment and other surface areas can have both positive and negative effects on shrimp production.
Sedimentation is a useful technique to manage aquaculture wastewater because a high proportion of suspended solids have a high sinking rate.
Dissolved oxygen concentration is perhaps the most important variable influencing the well-being of fish, shrimp and other aquatic life.
Shrimp aquaculture farm managers suspect pond bottom degradation and sediment accumulation as possible causes for production decreases.
Research in Alabama evaluates changes in chemical characteristics of production pond water, soils and shrimp yields in response to water recycling.
Biochemical oxygen demand is an index of the oxygen demand in wastewater, an important water quality variable used in effluent management.