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

photosynthesis

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. 

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. 

Health & Welfare

Proper water circulation in aquaculture ponds, Part 2

Promoting water circulation during the day time is an effective strategy to enrich pond water with oxygen produced by photosynthesis, and can significantly reduce the costs of night time supplemental aeration. Many types of effective, commercial water circulators are available. 

Health & Welfare

Proper water circulation in aquaculture ponds critical

Many aquaculture ponds require mechanical aeration both for increasing dissolved oxygen levels and to promote mixing of oxygen-rich and oxygen-depleted waters, which also helps prevent turnover. Promoting water circulation during the day time is an effective strategy to enrich pond 

Responsibility

Light penetration in water

Light penetrating water is scattered and absorbed exponentially as it passes downward. The presence of dissolved organic matter and suspended solids further impedes light penetration, and different types of solids absorb different wavelengths. 

Aquafeeds

Multiple methods for phytoplankton assessment

The simplest tool for assessing phytoplankton abundance in aquaculture ponds is the Secchi disk. An electronic turbidimeter can be used to measure the amount of light scattered by a water sample.