Sediment, water sampling in aquaculture
Simple tools can take water and sediment samples to monitor quality variables in aquaculture ponds. Water surface samples provide limited information, while water column sampling delivers more specific data.
Carp polyculture in India
Carp polyculture with other species originally established through government projects has grown in India thanks to the application of advancing technologies and private financial investments.
Polyculture: Varied applications, benefits spark renewed interest
Polyculture production boosts fish and/or shellfish biomass and harvests by maximizing the different feeding habits and habitat preferences of varied culture species.
Freshwater prawn farming in Thailand
While the industry faces issues, freshwater prawn farming in Thailand offers a lucrative alternative to other forms of farming on small farms.
Joint culture of carps in Bangladesh
The addition of cheap, fast-growing silver carp to ponds with major carps would allow farmers to sell fish while retaining some for food purposes.
Continued evolution: Polyculture in Bangladesh
Traditional culture of native carps in Bangladesh has been diversified by the polyculture of introduced carps with tilapia and catfish. Production is becoming increasingly intensive, with an accompanying need for greater feed and other inputs. The culture of Thai pangas has expanded more rapidly than tilapia farming because pangas carry less risk and also provide a quick return.
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.
Phytoplankton dynamics in aquaculture ponds
Phytoplankton are essential in intensive aquaculture ponds but an excess can result in shallow thermal stratification.
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.