Dissolved Oxygen Concentration in Aquaculture

What is considered the most important water quality variable in fish culture?

• Temperature

• pH level

• Dissolved oxygen concentration

• Salinity

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NGSS.MS-LS1-5

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What makes dissolved oxygen concentration so important in intensive fish culture?

• Its effect on fish behavior

• Its impact on water clarity

• Its role in nutrient cycling

• The speed at which it can change

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

What are the three factors that contribute to the dynamic nature of dissolved oxygen concentration?

• Temperature, pH level, and salinity

• Oxygen solubility, oxygen use rate, and oxygen diffusion

• Fish behavior, water clarity, and nutrient cycling

• Aeration, filtration, and water circulation

Which type of dissolved oxygen sensor uses gold or platinum as the cathode and silver as the anode?

• Polarographic or Clark sensors

• Galvanic sensors

• Fiber optic oxygen sensors

• None of the above

What is the purpose of calibrating an oxygen meter?

• To measure the concentration of dissolved oxygen directly

• To compare the electrical current to a known DO concentration

• To adjust the meter's response time

• To determine the meter's battery life

When should dissolved oxygen measurements be made in high-density commercial ponds?

• At dawn and dusk

• At noon and midnight

• Every hour or two

• Once a week

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NGSS.MS-LS2-3

What is the recommended location for measuring dissolved oxygen concentration in a pond?

• Near the pond bank

• Near the aeration devices

• 2 feet from the pond bank and 12 to 18 inches beneath the surface

• At the bottom of the pond

What is the potential risk associated with mixing low-oxygen bottom water with high-oxygen surface water in a pond?

• Increased fish feeding activity

• Decreased fish respiration

• Reduced nutrient cycling

• Decreased dissolved oxygen concentration

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NGSS.MS-LS2-1

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What is the purpose of monitoring dissolved oxygen concentration in aquaculture ponds?

• To determine the pH level of the water

• To assess the growth rate of fish

• To identify problem ponds and anticipate the need for aeration

• To measure the temperature of the water

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NGSS.MS-LS1-5

What is the recommended frequency for changing the membrane on a dissolved oxygen sensor?

• Every day

• Every week

• Every month

• Every year