This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Disease Control in Aquaculture”.
1. Diversity of antibiotic resistance genes is enhanced by aquaculture.
a) True
b) False
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Explanation: There is a widespread and unchecked use of antibiotics in aquaculture which leads to antibiotic resistant strains of various resident microbes. This leads to diversity in antibiotic resistant genes in the aquaculture environment.
2. Hydrogen peroxide, formalin, potassium permanganate are used for the treatment of ___________ in aquaculture.
a) parasites
b) bacteria
c) fungi
d) invertebrates
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Explanation: Treatments for parasites in cultured fish and shellfish in aquaculture environments include chlorine compounds, formalin, potassium permanganate, iodine, organophosphate, and copper sulfate.
3. Use of prebiotics is necessary when probiotics are being used in aquaculture ponds.
a) True
b) False
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Explanation: Prebiotics when used in conjunction with probiotics, greatly enhance the activity of the latter. The application of prebiotics is before during pond preparation, before the stocking takes place.
4. Lactobacillus rhamnosus has been used for the treatment of ________________
a) furunculosis
b) yellow-head disease
c) whitespot syndrome virus
d) anaerobiosis
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Explanation: Lactobacillus rhamnosus is a probiotic used for health benefits and improvement in gastrointestinal tract microbiome. In aquaculture it has been widely adopted as a treatment of furunculosis caused by Aeromonas salmonicida.
5. ____________ are indigestible ingredients of fish diet.
a) Probiotics
b) Prebiotics
c) Starch
d) Cellulose
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Explanation: Prebiotics are non-digestible ingredients of diet that stimulate the growth of beneficial organisms – the probiotics in an aquatic environment. Examples include mannans, glucans, yucca extract et cetera.
6. Chaetocerosis sp. is a ____________
a) feed component
b) rotifer
c) diatom
d) flagellate
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Explanation: Chaetocerosis sp. is a central diatom used as a live feed in larviculture and broodstock management. Live feed is mostly preferable over pellet feed in most of the aquaculture food production systems.
7. Which of the following probiotic bacteria has been shown to produce polyamines?
a) Rhodopseudomonas
b) Bacillus subtilis
c) Shigella
d) Debaromyces hansenni
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Explanation: Debaromyces hansenni used as a probiotic in aquaculture of finfish has been reported to produce such polyamines as spermine and spermidine which are responsible for differentiation and maturation of gastro-intestinal tract in mammals.
8. Which of the following is not increased when fish are in stress?
a) Gonadotropin
b) Cortisol
c) Lactase
d) Glucose
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Explanation: Gonadotropin levels are not elevated when the fish are under stress since this hormone is involved in initiation of spawning and reproduction in fish, which is otherwise diminished under a stressed environment.
9. Saprolegniosis is a _____________
a) freshwater fungal infection
b) marine anaerobiosis
c) yeast infection
d) structural deformity
View Answer
Explanation: Saprolegniosis is a fungal infection of finfish prevalent in freshwater environments. The causative microbe is Saprolegnia parasitica against which the probiotic containing Aeromonas media A199 has been developed.
10. Choose the correct option.
a) Salinity has no effect on ptobiotics
b) Temperature has no effect on probiotics
c) Salinity increases probiotic activity
d) Salinity decreases activity of probiotics
View Answer
Explanation: Environmental factors such as pH, Eh, salinity and temperature have a great influence on the survival and activity of delivered probiotics in the aquatic environment. Salinity has been shown to decrease the activity of probiotics.
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.
