Fish culture in Cameroon: Small-scale commercial
Fish culture has a relatively long history in Cameroon. Expanding aquaculture helps alleviate poverty and supply food where fish is the main source of protein.
Small-scale tilapia producers find success in Honduras
With a crisis in coffee prices, small-scale tilapia producers in Central America see growing the fish as a lifeline and source of livelihood.
Standardize terminology for low-salinity shrimp culture
There is increasing interest in low-salinity shrimp culture in inland areas because it is thought that disease control is easier to implement.
Correct liming improves pond water, bottom quality
Shrimp and fish farmers frequently apply liming materials to ponds to increase the pH of bottom soils, elevate alkalinity and water hardness and improve conditions for microbial activity and benthic animals.
Understanding pond pH
Natural waters uninfluenced by high biological activity seldom have pH above 8.5, but in fish or shrimp culture, pond pH levels can rise to 9 or higher.
Dissolved salts in water for inland, low-salinity shrimp culture
Low-salinity shrimp culture is an important activity in Thailand. Ponds contain water of 2 to 5 ppt salinity, mixing brine solution from coastal seawater with freshwater.
Denitrification in recirculating aquaculture systems: Comparison of aquatic plants
Denitrification by anaerobic bacteria can remove nitrates from RAS, but the operation requires anaerobic conditions and the addition of carbon sources.
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.
No single solution for effluent management
Where aquaculture is key to food or employment, policies regarding effluent management should be flexible to address various species, systems and environments.
Anion-cation balance in water
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.
Specific conductance: An alternative salinity measurement
Water's ability to conduct electricity increases with the total concentration of dissolved ions. Measuring conductivity helps estimate salt content of water.
Partitioned aquaculture systems
Partitioned aquaculture system for catfish and co-culture of tilapia can achieve catfish yields up to four times higher than conventional pond culture.
Model for managing organic sediment in aquaculture ponds
With increasing intensification of pond aquaculture, management of sediment like organic matter is becoming an important concern for pond managers.
Cage-cum-pond: Integrated aquaculture systems recycle wastes
Integrated aquaculture systems comprise large fish cultured intensively in cages and small fish cultured semi-intensively in the surrounding pond water.
Shrimp production systems with low/no water exchange
Research in a culture system without water exchange indicated that biological performance of postlarvae was similar.
Nitrogen and phosphorus loads vary by system
Adding nitrogen and phosphorus to natural waters can cause eutrophication. Discharge of these nutrients from aquaculture operations is under U.S. government evaluation.