This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Bioremediation in Aquaculture”.
1. Choose the smallest sized microbial genus.
a) Bacillus
b) Beggiatoa
c) Thioploca
d) Thiomargarita
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Explanation: Bacillus is the smallest bacterial genus of all the options. Beggiatoa, Thioploca, and Thiomargarita are big sulfur bacteria. These are autotrophic i.e. obtain carbon from carbon dioxide; as well as lithotrophic.
2. Which is not a source off aquaculture waste?
a) Fish metabolism
b) Unused feed
c) Excreta
d) Temperature gradient
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Explanation: Aggregated products of fish metabolism, unused feed (pellet feed), and excreta are sources of aquaculture waste. These increase the process of biodegradation thereby increasing the biological oxygen demand of the water.
3. Most of the bioremediation strategies in aquaculture are aimed at _____________
a) elevating ammonia
b) lowering ammonia
c) maintaining pH
d) temperature gradient control
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Explanation: Ammonia is one of the most toxic compounds in aquaculture generated primarily by fish metabolism. It is toxic above 0.02 mg/L. Most of the bioremediation techniques are therefore aimed at maintaining ammonia levels.
4. Water in shrimp farms contain high amount of nitrates and nitrites.
a) True
b) False
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Explanation: Due to a protein rich diet of shrimps there is an increased nitrates and nitrites load in the water. Therefore even in zero-exchange systems a portion of water has to be changed periodically.
5. Which is not a limitation in traditional shrimp pond system?
a) Length of growing season
b) Land limitation
c) High water exchange
d) Shrimp processing
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Explanation: Shrimp processing is not a limitation associated with traditional shrimp pond system. Length of growing season of the shrimp, land limitation and the requirement of high water exchange are some of the limitations.
6. Shrimp have a growing season based on ___________
a) feed
b) ammonia
c) pH
d) temperature
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Explanation: Shrimp have a growing season based on temperature hence ponds can only produce shrimp when the temperature is conducive for their growth. Coastal land is appropriate for shrimp farming and it is associated with greater environmental risks.
7. Which of the following is not true for recirculating raceway system of shrimp aquaculture?
a) High water exchange
b) Ease of feeding
c) High productivity
d) Easy harvesting
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Explanation: Recirculating raceway systems combine the advantage of raceways and recirculating systems. The system enables growth of shrimp in high densities with minimal water exchange.
8. After the filtration process is complete in the bead filter, it is ____________
a) discarded
b) coated
c) acidified
d) backwashed
View Answer
Explanation: To remove suspended solids from the circulated water of a shrimp farm, an industrial bead filter is used. After the completion of filtration process the filter is backwashed by reversing the water flow.
9. Which is not true about Litopenaeus vannamei?
a) Can be invasive
b) Growth in wide salinity range
c) Slow growing
d) Disease resistant
View Answer
Explanation: The Pacific white shrimp Litopenaeus vannamei is the most grown species in global aquaculture industry. It is fast growing, has good survival rate and can tolerate a wide range of salinity from 1-40 mg/L.
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.
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