EPA drafts effluent guidelines for U.S. aquaculture
The United States Environmental Protection Agency published draft aquaculture effluent guidelines in the Federal Register.
Organic matter in pond bottom sediment
Organic matter – including fertilizers, unconsumed feed and feces of culture animals – settles to pond bottoms, often with a negative impact on water quality.
Integrated fish-seaweed culture systems
The use of integrated mariculture systems incorporating seaweed biofilters addresses the impact of discharges, promoting more sustainable production.
Role of tilapia in rural aquaculture
Tilapia play an important role in rural aquaculture in Asia, but their potential for significantly greater contribution is constrained.
Utilization of heterotrophic and autotrophic bacteria in aquaculture
An adequate understanding of autotrophic and heterotrophic bacteria is important to design and manage many aquaculture operations.
Land and water use issues in aquaculture
It behooves us to understand land and water use issues and understand the differences between aquaculture and traditional agriculture.
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.
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.
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.