Texas Aquaculture Facility Operator
License Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
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1. What is the optimal pH range for most freshwater aquaculture species
in Texas?
A. 4.0–5.0
B. 5.5–6.0
C. 6.5–9.0
D. 9.5–11.0
A pH range of 6.5 to 9.0 ensures optimal metabolic and physiological
function for most aquaculture species.
2. Which agency regulates aquaculture permits in Texas?
A. Texas Department of Agriculture
B. Texas Parks and Wildlife Department
C. Environmental Protection Agency
D. Texas Department of Health Services
,TPWD oversees permits, species importation, and aquatic species health in
Texas aquaculture.
3. What is the major nitrogenous waste excreted by fish?
A. Nitrite
B. Nitrate
C. Carbon dioxide
D. Ammonia
Ammonia is excreted by fish and must be managed to prevent toxicity.
4. Which filtration method is primarily used to remove solid waste from
recirculating systems?
A. Mechanical filtration
B. Biological filtration
C. Chemical filtration
D. Reverse osmosis
Mechanical filtration traps solid particles and debris from the water.
5. A common method to reduce dissolved oxygen levels at night is:
A. Turn off all pumps
B. Use aerators continuously
C. Drain the pond partially
D. Increase fish density
Aerators maintain dissolved oxygen, especially during nighttime
respiration peaks.
, 6. Which of the following is a warmwater species commonly farmed in
Texas?
A. Rainbow trout
B. Channel catfish
C. Arctic char
D. Sockeye salmon
Channel catfish thrive in Texas’s warm waters and are economically
important.
7. What is the primary function of biofilters in recirculating aquaculture
systems?
A. Reduce temperature
B. Convert ammonia to nitrate
C. Add oxygen
D. Kill pathogens
Biofilters host nitrifying bacteria that convert toxic ammonia to less
harmful nitrate.
8. What is the term for a disease that spreads from fish to humans?
A. Mycosis
B. Zoonosis
C. Phagocytosis
D. Parasitism
, Zoonotic diseases can be transmitted between fish and humans, such as
certain bacterial infections.
9. When transporting fish, the most critical factor to monitor is:
A. Color
B. Fin size
C. Dissolved oxygen
D. Feed intake
Oxygen levels can quickly deplete in transport containers, leading to stress
or death.
10. What is a Secchi disk used to measure?
A. Salinity
B. Water clarity (turbidity)
C. Oxygen saturation
D. pH level
A Secchi disk estimates water transparency to help assess plankton density
and pond health.
11. Which of the following is a potential invasive aquaculture
species in Texas?
A. Bluegill
B. Rainbow trout
C. Tilapia
D. Largemouth bass
License Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
Download Pdf
1. What is the optimal pH range for most freshwater aquaculture species
in Texas?
A. 4.0–5.0
B. 5.5–6.0
C. 6.5–9.0
D. 9.5–11.0
A pH range of 6.5 to 9.0 ensures optimal metabolic and physiological
function for most aquaculture species.
2. Which agency regulates aquaculture permits in Texas?
A. Texas Department of Agriculture
B. Texas Parks and Wildlife Department
C. Environmental Protection Agency
D. Texas Department of Health Services
,TPWD oversees permits, species importation, and aquatic species health in
Texas aquaculture.
3. What is the major nitrogenous waste excreted by fish?
A. Nitrite
B. Nitrate
C. Carbon dioxide
D. Ammonia
Ammonia is excreted by fish and must be managed to prevent toxicity.
4. Which filtration method is primarily used to remove solid waste from
recirculating systems?
A. Mechanical filtration
B. Biological filtration
C. Chemical filtration
D. Reverse osmosis
Mechanical filtration traps solid particles and debris from the water.
5. A common method to reduce dissolved oxygen levels at night is:
A. Turn off all pumps
B. Use aerators continuously
C. Drain the pond partially
D. Increase fish density
Aerators maintain dissolved oxygen, especially during nighttime
respiration peaks.
, 6. Which of the following is a warmwater species commonly farmed in
Texas?
A. Rainbow trout
B. Channel catfish
C. Arctic char
D. Sockeye salmon
Channel catfish thrive in Texas’s warm waters and are economically
important.
7. What is the primary function of biofilters in recirculating aquaculture
systems?
A. Reduce temperature
B. Convert ammonia to nitrate
C. Add oxygen
D. Kill pathogens
Biofilters host nitrifying bacteria that convert toxic ammonia to less
harmful nitrate.
8. What is the term for a disease that spreads from fish to humans?
A. Mycosis
B. Zoonosis
C. Phagocytosis
D. Parasitism
, Zoonotic diseases can be transmitted between fish and humans, such as
certain bacterial infections.
9. When transporting fish, the most critical factor to monitor is:
A. Color
B. Fin size
C. Dissolved oxygen
D. Feed intake
Oxygen levels can quickly deplete in transport containers, leading to stress
or death.
10. What is a Secchi disk used to measure?
A. Salinity
B. Water clarity (turbidity)
C. Oxygen saturation
D. pH level
A Secchi disk estimates water transparency to help assess plankton density
and pond health.
11. Which of the following is a potential invasive aquaculture
species in Texas?
A. Bluegill
B. Rainbow trout
C. Tilapia
D. Largemouth bass
