Aquaculture Exams (correct answers)
What are the two forms of TAN? How do they differ? correct answers NH2=toxic
NH3=non toxic
What is the source of TAN? correct answers Poop and pee. Rotting/decomposing
materials
What is the effect of temperature and pH and TAN? correct answers Higher
temperature, higher the a pH, higher the TAN
What should you do if TAN is high? correct answers Add fresh water
What is the effect of high TAN on fish correct answers Brown blood disease
What is the desired level for unionized ammonia? At what level does it become
harmful? correct answers 0; 0.05 mg/L death occurs at 2.0
Why does lower pH improve TAN? correct answers Lower the pH to prevent high
ammonia levels
Why does avoiding over feeding reduce ammonia? correct answers If you feed them
more, they will have more waste and it will dissolve in the water to increase ammonia
ions
What nitrite reading is harmful to fish? correct answers 0.2 mg/L and above
How do you treat high nitrite levels? correct answers Reduce feeding and flush with
fresh water and add salt
What is brown blood disease correct answers Changing hemoglobin to methemoglobin
so that the blood is unable to combine with oxygen
Why is algae growth good correct answers Fish can eat it and helps process harmful
diseases
Write the simple formula that describes the nitrogen cycle in a recirculating system
correct answers TAN=NH3 + NH4
What is biofiltration correct answers Uses living material to remove soluble waste
What is the difference between solid and soluble wastes correct answers Solids fall to
the bottom of the tank soluble waste dissolve in the water
Show a simple equation to express nitrogen conversion during biofiltration correct
answers AMMONIA nitrosomas > NITRITE nitrobaiter> NITRATE
What are the two forms of TAN? How do they differ? correct answers NH2=toxic
NH3=non toxic
What is the source of TAN? correct answers Poop and pee. Rotting/decomposing
materials
What is the effect of temperature and pH and TAN? correct answers Higher
temperature, higher the a pH, higher the TAN
What should you do if TAN is high? correct answers Add fresh water
What is the effect of high TAN on fish correct answers Brown blood disease
What is the desired level for unionized ammonia? At what level does it become
harmful? correct answers 0; 0.05 mg/L death occurs at 2.0
Why does lower pH improve TAN? correct answers Lower the pH to prevent high
ammonia levels
Why does avoiding over feeding reduce ammonia? correct answers If you feed them
more, they will have more waste and it will dissolve in the water to increase ammonia
ions
What nitrite reading is harmful to fish? correct answers 0.2 mg/L and above
How do you treat high nitrite levels? correct answers Reduce feeding and flush with
fresh water and add salt
What is brown blood disease correct answers Changing hemoglobin to methemoglobin
so that the blood is unable to combine with oxygen
Why is algae growth good correct answers Fish can eat it and helps process harmful
diseases
Write the simple formula that describes the nitrogen cycle in a recirculating system
correct answers TAN=NH3 + NH4
What is biofiltration correct answers Uses living material to remove soluble waste
What is the difference between solid and soluble wastes correct answers Solids fall to
the bottom of the tank soluble waste dissolve in the water
Show a simple equation to express nitrogen conversion during biofiltration correct
answers AMMONIA nitrosomas > NITRITE nitrobaiter> NITRATE
