News features and technical articles about the evolution of aquaculture, one of the world’s fastest growing industries.

mechanical aeration

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Shrimp farming in Guatemala has gone intensive

Guatemala’s shrimp-farming growth is due to a highly intensive system of small ponds and shorter cycles. Production of close to 25,000 metric tons is expected in 2018. 

Health & Welfare

Dissolved oxygen dynamics

Dissolved oxygen management is the most important requirement of aquaculture pond water quality. DO concentration below 3 mg/L is stressful to shrimp. 

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Effects of mechanical aeration on evaporation rate, water temperature

This study compared water temperature and water loss by evaporation in control ponds and in ponds aerated with surface aerators at four different aeration rates. Increased aeration rate increases the evaporation rate, which in turn lowers water temperature. 

Health & Welfare

Phytoplankton and its impact on water quality

Phytoplankton has several important effects on water quality, including removing ammonia nitrogen from water and absorbing nutrients from the water for its growth. Abundance of blue-green algae tends to increase as nutrient inputs in aquafeeds or fertilizers increase. 

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The complex principles of redox measurement

Keep adequate concentrations of dissolved oxygen in the culture water by balancing stocking and feeding rates with the amount of mechanical aeration applied. To prevent anaerobic conditions at the sediment-water interface, aerators should be positioned to promote the flow of 

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Efficiency of mechanical aeration

Although relatively expensive, mechanical aeration increases production. Asian-style paddlewheel aerators are widely used but are inefficient. Testing has led to more efficient designs that are now widely used in U.S. catfish and shrimp ponds.