Biofloc Technology in Fisheries and Aquaculture
Objective Questions on Biofloc Technology (BFT) in Fisheries
Biofloc Technology System
MCQ on Biofloc Technology
-
What is biofloc technology?
- a) A method of growing plants in water
- b) A method of aquaculture that uses microbial communities to convert waste into nutrients for aquatic organisms
- c) A method of growing algae in water
- d) A method of fish farming that uses artificial light to enhance growth
Answer: b
-
What is the purpose of aeration systems in biofloc technology?
- a) To maintain the temperature of the water in the culture tanks
- b) To remove contaminants from the water in the culture tanks
- c) To maintain oxygen levels in the culture tanks
- d) To provide the aquatic organisms with food
Answer: c
-
What is the function of biofilter systems in biofloc technology?
- a) To remove settled solids from the water in the culture tanks
- b) To maintain water quality in the culture tanks
- c) To provide the aquatic organisms with food
- d) To control the temperature of the water in the culture tanks
Answer: b
-
What is the purpose of settling tanks in biofloc technology?
- a) To remove contaminants from the water in the culture tanks
- b) To maintain water quality in the culture tanks
- c) To remove settled solids from the water in the culture tanks
- d) To maintain oxygen levels in the culture tanks
Answer: c
-
What is the importance of water treatment systems in biofloc technology?
- a) To remove settled solids from the water in the culture tanks
- b) To maintain water quality in the culture tanks
- c) To provide the aquatic organisms with food
- d) To control the temperature of the water in the culture tanks
Answer: b
-
Which of the following is a benefit of using biofloc technology in aquaculture?
- a) Reduced water usage
- b) Higher energy costs
- c) Increased reliance on antibiotics
- d) Increased use of chemical fertilizers
Answer: a
-
What type of organisms can be grown using biofloc technology?
- a) Only fish
- b) Only shrimp
- c) Both fish and shrimp
- d) Only algae
Answer: c
-
What is the optimal pH range for biofloc systems?
- a) 6.0-6.5
- b) 7.0-7.5
- c) 8.0-8.5
- d) 9.0-9.5
Answer: b
-
What is the typical color of biofloc in culture tanks?
- a) Green
- b) Blue
- c) Brown
- d) Red
Answer: c
-
What is the primary nutrient source for biofloc microbial communities?
- a) Sunlight
- b) Oxygen
- c) Nitrogen
- d) Carbon
Answer: d
-
What is the role of probiotics in biofloc technology?
- a) To provide additional nutrients for the aquatic organisms
- b) To control the pH of the culture tanks
- c) To enhance the growth of beneficial microbial communities
- d) To reduce the need for water treatment systems
Answer: c
-
What is the typical size range of biofloc particles?
- a) 1-10 microns
- b) 10-100 microns
- c) 100-1000 microns
- d) 1000-10,000 microns
Answer: b
-
What is the purpose of using paddlewheels in biofloc culture tanks?
- a) To control the temperature of the water
- b) To distribute oxygen throughout the water
- c) To mix the water and promote microbial growth
- d) To remove contaminants from the water
Answer: c
-
Which of the following is a disadvantage of using biofloc technology?
- a) Increased reliance on antibiotics
- b) Higher energy costs
- c) Increased use of chemical fertilizers
- d) Higher water usage
Answer: b
-
What is the primary benefit of using biofloc technology in aquaculture?
- a) Increased yield
- b) Reduced water usage
- c) Improved taste of the fish or shrimp
- d) Reduced cost of production
Answer: b
-
What is the purpose of adding carbon sources to biofloc culture tanks?
- a) To provide additional nutrients for the aquatic organisms
- b) To control the pH of the culture tanks
- c) To enhance the growth of beneficial microbial communities
- d) To reduce the need for water treatment systems
Answer: c
-
What is the typical salinity range for biofloc culture tanks?
- a) Freshwater
- b) Brackish water
- c) Saltwater
- d) Any salinity level is suitable
Answer: b
-
What is the role of heterotrophic bacteria in biofloc technology?
- a) To convert ammonia into nitrate
- b) To convert nitrate into nitrogen gas
- c) To break down organic matter and convert it into microbial biomass
- d) To produce oxygen through photosynthesis
Answer: c
-
Which of the following is a common biofloc species?
- a) Bacillus subtilis
- b) Vibrio parahaemolyticus
- c) Staphylococcus aureus
- d) Pseudomonas aeruginosa
Answer: a
-
What is the primary disadvantage of using biofloc technology in cold water environments?
- a) Poor water quality
- b) Reduced microbial activity
- c) Increased energy costs
- d) Higher mortality rates among aquatic organisms
Answer: b
-
What is the role of aeration in biofloc culture tanks?
- a) To distribute oxygen throughout the water
- b) To control the temperature of the water
- c) To promote the growth of beneficial bacteria
- d) To remove contaminants from the water
Answer: a
-
Which of the following is a factor that can affect the quality of biofloc?
- a) Water temperature
- b) Amount of sunlight
- c) Nutrient concentration
- d) All of the above
Answer: d
-
What is the primary factor that determines the size of biofloc particles?
- a) Water temperature
- b) Nutrient concentration
- c) Aeration rate
- d) Water flow rate
Answer: b
-
What is the ideal carbon-to-nitrogen ratio for biofloc systems?
- a) 5:1
- b) 10:1
- c) 15:1
- d) 20:1
Answer: c
-
Which of the following is a benefit of using biofloc technology in shrimp farming?
- a) Reduced incidence of disease
- b) Increased reliance on antibiotics
- c) Reduced energy costs
- d) Increased need for chemical fertilizers
Answer: a
-
What is the primary source of nitrogen in biofloc systems?
- a) Ammonia
- b) Nitrate
- c) Nitrite
- d) Organic matter
Answer: a
-
What is the role of phytoplankton in biofloc systems?
- a) To control the pH of the culture tanks
- b) To provide additional nutrients for the aquatic organisms
- c) To compete with heterotrophic bacteria for nutrients
- d) To break down organic matter and convert it into microbial biomass
Answer: b
-
What is the typical dissolved oxygen level in biofloc culture tanks?
- a) Less than 1 mg/L
- b) 1-3 mg/L
- c) 3-5 mg/L
- d) Greater than 5 mg/L
Answer: c
-
What is the primary benefit of using biofloc technology in fish farming?
- a) Improved growth rates
- b) Reduced incidence of disease
- c) Improved water quality
- d) Increased reliance on antibiotics
Answer: c
-
Which of the following is a common type of biofloc reactor?
- a) Stirred-tank reactor
- b) Membrane reactor
- c) Bioreactor
- d) Photobioreactor
Answer: a
-
What is the role of microbial flocs in biofloc systems?
- a) To consume excess nutrients and maintain water quality
- b) To provide a food source for the aquatic organisms
- c) To control the pH of the culture tanks
- d) To reduce the need for water treatment systems
Answer: a
-
What is the optimal temperature range for biofloc systems?
- a) 10-15°C
- b) 20-25°C
- c) 30-35°C
- d) 40-45°C
Answer: b
-
What is the primary source of carbon in biofloc systems?
- a) Algae
- b) Organic matter
- c) Atmospheric carbon dioxide
- d) Chemical fertilizers
Answer: b
-
Which of the following is a disadvantage of using biofloc technology in aquaculture?
- a) Reduced energy costs
- b) Increased reliance on antibiotics
- c) Higher water usage
- d) Reduced yield
Answer: d
-
What is the purpose of adding calcium carbonate to biofloc culture tanks?
- a) To control the pH of the water
- b) To provide a substrate for bacterial attachment
- c) To provide additional nutrients for the aquatic organisms
- d) To increase the salinity of the water
Answer: a