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

Secchi disk


Thoughts on pond fertilization

Prof. Boyd provides additional insights into fertilization of aquaculture ponds, discussing phytoplankton requirements, organic and inorganic fertilizers, and other relevant aspects of pond management. 


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. 

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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.