This set of Basic Marine Biotechnology Questions and Answers focuses on “Sustainable Marine Food Production Systems – Set 3”.
1. Conventional flow-through system is referred to as FTS.
a) True
b) False
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Explanation: Conventional cage-based and flow-through (FTS) are now being replaced by recirculating aquaculture systems (RAS) due to a lack of expansion space and availability of fresh water. RAS has been promoted mainly by such European countries as Norway, Ireland, United Kingdom and Italy.
2. RAS is a technology for ____________________
a) extensive fish farming
b) intensive fish farming
c) marine aquaculture
d) seaweed production
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Explanation: Recirculating aquaculture (RAS) is a technology for intensive fish farming that gives the advantage of recycling 90-99% of the culture water. It is a potential alternate for conventional FTS.
3. While concentration of oxygen in an aquaculture system decreases, ______________
a) unwanted water quality parameters increase
b) biological oxygen demand increases
c) chemical oxygen demand increases
d) respiration rate increases
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Explanation: Oxygen demand and oxygen concentration are the most critical factors in intensive farming. When there is a decrease in oxygen concentration, the concentration of unwanted water quality parameters increase.
4. River or lake water is a source of freshwater.
a) True
b) False
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Explanation: In conventional fish farming, freshwater is used for the culture of mostly freshwater species. Other sources include rainwater and municipality water. To counter the shortage in freshwater supply and availability, recycled water is now being used.
5. The biofilter in RAS is negatively affected when ________________
a) stocking density is low
b) solids are efficiently removed
c) solids accumulate
d) oxygen concentration is appropriate
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Explanation: Biofilter – responsible for efficient removal of ammonia and nitrite from the system, is negatively affected when solids accumulate in the system due to blocking or clogging of the filter. Hence removal of suspended solids is a matter of concern.
6. Which of the following does not affect biofilter’s efficiency?
a) Type of culture species
b) Size of filter
c) Suspended solids
d) Bacterial species
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Explanation: Although stocking density directly influences the efficiency of biofilter, the culture species does not. The major factor that affects biofilter efficiency is suspended solids, greater accumulation of suspended solids lead to predominance of heterotrophic bacteria compared to autotrophic bacteria.
7. As suspended solids concentration ____________________
a) biofilter efficiency decreases
b) heterotrophic bacteria decrease
c) autotrophic bacteria increase
d) ozonation efficiency decrease
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Explanation: Increase in suspended solids results in decreased ozonation efficiency therefore requiring additional contact times and therefore greater concentration of O3 byproducts in the culture environment.
8. MIB and geosmin are responsible for __________________
a) denitrification
b) nitrification
c) off-flavored fish
d) biomitigation
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Explanation: Geosmin and 2-methylisoborneol are responsible agents for earthy and musty taste in the products leading to off-flavored fish. As per literature creating anaerobic conditions can be a possible alternate for remediating this.
9. Methane provides estimation for _____________________
a) hydrogen sulfide
b) sulfate
c) redox potential
d) carbon dioxide
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Explanation: Methane CH4 is a gas generated usually by methane producing anaerobic bacteria in aquaculture. Methane can give an estimate of dissolved carbon dioxide concentration of the culture system.
10. The correct order of virus isolation from fish sample includes __________________________
a) monolayer preparation, extraction from tissue, cytopathic effect
b) cytopathic effect, monolayer destruction, focal degeneration
c) extraction of virus, cytopathic effect, monolayer preparation
d) incubation, CPE observation, monolayer preparation
View Answer
Explanation: Unlike bacteria isolation of fish viruses can be done only using cell lines. Process starts by preparation of monolayer culture, followed by extraction from fish tissue, incubation of monolayer with extracts and observing cytopathic effect.
11. Which is not a technique for isolation of small fish viruses?
a) Hemadsorption
b) Immunofluorescence
c) Hemagglutination
d) Mass spectroscopy
View Answer
Explanation: Small fish viruses do not produce cytopathic effect (CPE) in monolayer cultures hence making their detection difficult. Techniques such as hemagglutination, hemadsorption and immunofluorescence are used for such cultures.
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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