This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Recirculating Aquaculture System”.
1. _______________ is used to hold and purge off-flavor fish.
a) Tank systems
b) RAS
c) Microfluidics
d) Aquaponics
View Answer
Explanation: Ever since the popularity of recirculating aquaculture systems, tank systems are now being used for holding and purging the off-flavor or contaminated fish, till the pond reared fish becomes acceptable for marketing.
2. RAS systems are most suitable in cold climates.
a) True
b) False
View Answer
Explanation: Recirculating Aquaculture System (RAS) is a suitable alternative to conventional fish farming in areas with a cooler climate (northern areas). Fish require a warm temperature to reach marketable size.
3. Which system is more suitable for trout fish?
a) Closed
b) Raceway
c) RAS
d) Open
View Answer
Explanation: Open or flow-through systems are more suitable for trout (cold water fish). High quality water is required for trout species as is possible in an open system. RAS is more suitable for such warm water fish.
4. Which of the following cannot tolerate lower water quality conditions?
a) Trout
b) Sea bass
c) Tilapia
d) Channel catfish
View Answer
Explanation: Sea bass (and striped bass), tilapia, and channel catfish are warm water fish capable of tolerating lower water quality conditions as well as higher water temperature unlike trout fish species. The trout is therefore not suitable for culturing in an RAS.
5. ________________ in aquaculture water occurs in two forms, sum equals TAN.
a) Selenium
b) Sulfur
c) Carbon
d) Ammonia
View Answer
Explanation: Ammonia occurs in two forms in the aquaculture water namely ionized ammonium ion (NH4+) and free ammonia (NH3). The sum of the two forms equals Total ammonia nitrogen (TAN).
6. When ammonium ion increases, ammonia will decrease.
a) True
b) False
View Answer
Explanation: Ammonium ion and ammonia equals Total Ammonia Nitrogen (TAN), a specific value at a particular temperature and pH. If either of the two increases or decreases the other compensates to keep the TAN value stable.
7. The brown blood disease occurs in cultured fish due to ____________________ toxicity.
a) Nitrite
b) Nitrate
c) Ammonia
d) Hydrogen sulphide
View Answer
Explanation: The brown blood disease, methemoglobinemia, occurs in cultured channel catfish and salmon due to nitrite toxicity (levels above 0.5 mg/L). In this disease a respiratory pigment forms that cannot transport oxygen.
8. In an RAS, plenty of ________________ is required before and after the biofiltration process.
a) Nitrogen
b) Carbon monoxide
c) Oxygen
d) Carbon dioxide
View Answer
Explanation: In an RAS, plenty of oxygen is required after biofiltration, essentially the process of nitrification by Nitrosomonas and Nitrobacter. For every 1 gram of ammonia converted to nitrate 5 grams of oxygen is required, an additional 5 grams of oxygen is required to meet BOD requirements of the nitrifying bacteria.
Sanfoundry Global Education & Learning Series – Marine Biotechnology.
To practice all areas of Marine Biotechnology, here is complete set of 1000+ Multiple Choice Questions and Answers.
If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]
