Marine Biotechnology Questions and Answers – Biotechnological Interventions in Fish Health

This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Biotechnological Interventions in Fish Health”.

1. Aquaculture waste resembles more to sewage waste than industrial waste.
a) True
b) False
View Answer

Answer: a
Explanation: The nutritional make-up of the waste is the deciding factor of how efficiently the biological degradation takes place. Aquaculture waste consists more of carbonaceous and nitrogen-containing wastes which are easily biodegraded without requiring an addition of inorganics.

2. Choose the appropriate option.

1. Protease a. skim-milk agar
2. Amylase b. starch agar
3. Lipase c. tributyrin agar

a) a-1, b-2, c-3
b) a-3, b-2, c-1
c) a-2, b-1, c-3
d) a-1, b-3, c-2
View Answer

Answer: a
Explanation: Before commercializing and also during the development stage, efficacy of various microbial strains deemed to function as probiotics in aquaculture, is assessed. One measure is to check the production of digestive enzymes such as protease, amylase and lipase in various agar preparations.

3. Control of water color is P. vannamei pond is easier.
a) True
b) False
View Answer

Answer: a
Explanation: Shrimp aquaculture is most popular in coastal areas of various Asian countries. As has been reported by various aquaculture farmers as well as scientists, controlling water color of the culture system is easier for Penaeus vannamei as compared to Penaeus monodon.

4. BWSS and WSSV refer to ____________ in cultured shrimps.
a) different disease
b) same disease
c) morphogenesis
d) smolting
View Answer

Answer: a
Explanation: Bacterial white spot syndrome (BWSS) and white spot syndrome virus (WSSV) refer to different ailments in cultured shrimps. The former is less severe although has same physical symptoms like the latter.

5. Which of the following can be used to detect low levels of viral infection in fish?
a) Diagnotic PCR
b) Gel electrophoresis
c) Gel chromatography
d) Liquid chromatography
View Answer

Answer: a
Explanation: Diagnostic PCR (polymerase chain reaction) can be used in the fields or on-site to detect very minuscule amount of viral or bacterial pathogen load. This technique has revolutionized the practice of disease management in aquaculture.

6. Which can be used as a measure of stress in finfish?
a) Water quality
b) Ammonia levels
c) Oxygen levels
d) Anti-oxidant levels
View Answer

Answer: d
Explanation: In finfish aquaculture and in corresponding tissue culture, anti-oxidant levels are often measured to analyze the stress response of the organism. Various assays are performed using established cell lines and larval stages of fish.

7. _____________ is the estimate of time a product spends in an aquaculture environment.
a) Growth period
b) Grow-out time
c) Hatching time
d) Withdrawal time
View Answer

Answer: d
Explanation: Withdrawal time is an important parameter which must be specified on a commercialized aquaculture product. It is the indication of time for which the residues of a product stay in the intestine of an organism and/or in the water column.

8. Which of the following is not necessary for indication on an aquaculture product label?
a) Production method
b) Strain identity
c) Mode of action
d) Dosage
View Answer

Answer: a
Explanation: According to regulations laid down by the Ministry of Agriculture, India, in regard of commercializing aquaculture products such as chemicals and probiotics, several indications are mandatory on the product label. Method of production is not one of these items.

9. Choose the correct option.

1. Immune-stimulants a. specific immune system
2. Vaccines b. non-specific immune system
c. glucans, lipo-polysaccharides

a) a-2, b-1, c-1
b) a-1, b-1, c-2
c) a-1, b-2, c-1
d) a-2, b-1, c-2
View Answer

Answer: a
Explanation: Although invertebrates and finfish do not have a well-organized immune system like that of human beings, various approaches have been used to stimulate the rudimentary forms of immune system that these organisms harbor.

10. Which of the following only stimulates the non-specific immune system in fish?
a) Vaccines
b) Vibrios
c) Metal contaminants
d) Vitamin C
View Answer

Answer: d
Explanation: Vitamin C along with vitamin E, glucans and several polysaccharides of microbial origin have been used as potential immune-stimulants in finfish aquaculture. Immune stimulation is a prophylactic measure against various bacterial (not viral) diseases.

11. Which of the following is not used as an anesthetic in aquaculture?
a) MS-222
b) Benzocaine
c) Butanol
d) Vitamin E
View Answer

Answer: d
Explanation: Anesthetics are used in aquaculture to minimize stress in fish while transferring them from wild to hatcheries and/or from hatcheries to grow-out ponds. Vitamin E has been used as an immune-stimulant and not as anesthetic in aquaculture.

12. Choose the correct option.

1. Ovaprim a. Salmon GnRH
2. Ovatide b. Dompexidone

a) a-1, b-2
b) a-1, b-1
c) a-2, b-1
d) a-2, b-2
View Answer

Answer: a
Explanation: Ovaprim, ovatide, and ovopel are popular commercial hormone preparations used in aquaculture. Ovaprim contains analogue of salmon GnRH (gonadotropin releasing horome) and ovatide contains dopamine antagonist dompexidone.

13. Which is not true for pheromones used in aquaculture medicine?
a) External activity
b) Used in composite fish culture
c) Inhibit cannibalism
d) Induce aggression behavior
View Answer

Answer: d
Explanation: Pheromones and reproductive hormones are two different classes of hormones administered in aquaculture medicine. Pheromones inhibit aggression and cannibalism.

14. Which is not a hazard associated with consumption raw seafood?
a) Trematodiasis
b) Cestodiasis
c) Hematodiasis
d) Sclerosis
View Answer

Answer: d
Explanation: Raw/uncooked seafood has shown to cause various ailments due to transfer of pathogens as well as hazardous chemicals from fish to human beings. Sclerosis is not a disease that can be caused due to this.

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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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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