Phytoplankton dynamics in aquaculture ponds
Phytoplankton are essential in intensive aquaculture ponds but an excess can result in shallow thermal stratification.
Study identifies maximum holding times for water samples
Although pond water samples collected to measure water quality are often held on ice, the values of some common variables in the samples can vary over time.
Disinfectant use in aquaculture
Although disinfectants kill bacteria, viruses and other organisms, they can also be hazardous to employees, culture animals and the environment.
Health management in recirculating systems
Recirculating systems and health management schemes should be designed concurrently to maximize their effectiveness.
Measuring circulation, mixing in ponds
There are several methods for evaluating water circulation and mixing in aquaculture ponds. Measurements of concentrated salt dispersal can be complex.
Best management practices minimize impacts of aquaculture effluents
Both aquaculture effluents and production costs can be reduced by using stock-specific feeds applied in smaller quantities several times a day.
Simple solution: Turf mats collect soft-shell clam spat
For soft-shell clam spat collection, artificial turf mats laid directly on the substratum can increase settlement of commercial-size clam spat.
Mechanical water circulation aids pond water quality
Mechanical water circulation can prevent stratification and provide more dissolved oxygen near pond bottoms. Strong water mixing can also control algae growth.
Water level management, BMPs cut water use, pond effluents
Pond water level management can reduce overflow volume and ground water use. Implementing BMPs reduces pollutant discharge.
Effluent effects from aquaculture ponds
In general, lower-intensity pond and cage farming tends to discharge higher overall pollution loads in farm effluents than closed aquaculture systems.
Automated temperature-controlled recirculation systems
A temperature-control system with a central chiller was found to enhance chilling and research capacity over a system with multiple unit chillers because replicating experiments in a single process control system minimized variations in the temperatures and chilling rates in the individual tanks. Temperature-holding experiments found slight differences at different temperature levels.
Varied microbes important to recirculating aquaculture systems
Microbes facilitate high-intensity recirculating aquaculture systems. Research indicates that the microbial community changes throughout grow-out.
Integration, modeling key to advancing aquaculture
Careful assessments, modeling and integration of juvenile releases with other fisheries management measures can help restore stocks in objectively planned enhancement programs.
Land use for aquaculture production
Space requirements for aquaculture include the culture water area and associated physical culture facilities as well as the land used to raise plant-based feed ingredients.
Flawed risk assessment of contaminants in salmon
A risk assessment of PCBs and other contaminants in farmed and wild salmon was flawed and did not reflect public health community opinions.
Tractor-powered paddlewheels provide emergency pond aeration
Even with dedicated aerators, aquaculture farms can experience stress and mortality in culture animals due to low dissolved oxygen concentrations in pond water. Simple tractor-powered aerators offer a quick and portable solution to low dissolved oxygen levels that provides strong emergency aeration and water movement.