During daylight, what is the effect of phytoplankton activity on dissolved oxygen in the pond?

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Prepare for the Aquaculture Technician Certification Test. Study with flashcards and multiple choice questions, each question offering hints and explanations to ensure you are ready for your exam!

Multiple Choice

During daylight, what is the effect of phytoplankton activity on dissolved oxygen in the pond?

Explanation:
During daylight, phytoplankton photosynthesize, using light to convert CO2 and water into organic matter and oxygen. This directly releases oxygen into the water, so dissolved oxygen rises. The amount of increase depends on light availability, nutrient levels, temperature, and how dense the phytoplankton bloom is. While respiration by microorganisms also uses oxygen, the daytime production from photosynthesis generally exceeds consumption, giving a net increase in dissolved oxygen. The other ideas aren’t the primary daytime outcome: there is a real rise in DO, and the effect isn’t limited to pH changes.

During daylight, phytoplankton photosynthesize, using light to convert CO2 and water into organic matter and oxygen. This directly releases oxygen into the water, so dissolved oxygen rises. The amount of increase depends on light availability, nutrient levels, temperature, and how dense the phytoplankton bloom is. While respiration by microorganisms also uses oxygen, the daytime production from photosynthesis generally exceeds consumption, giving a net increase in dissolved oxygen. The other ideas aren’t the primary daytime outcome: there is a real rise in DO, and the effect isn’t limited to pH changes.

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