Marine Biotechnology Questions and Answers – Fish Genetics – Broodstock Development – Set 4

This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Fish Genetics – Broodstock Development – Set 4”.

1. Which is not a gonadotropin release hormone analog?
a) Ovaprim
b) Ovatide
c) Ovaplat
d) β-glucan
View Answer

Answer: b
Explanation: Ovaprim, Ovatide and Ovaplat are commercial preparations containing super active analogs of the Gonadotropin release hormone (GnRH). β-glucan is an immune-stimulant derived from the cell walls of fungi.

2. In fish _______________ has anti-gonadotropin action.
a) serotonin
b) luteinizing hormone
c) dopamine
d) hydrogen sulphide
View Answer

Answer: b
Explanation: Dopamine, a neurotransmitter is the hormone responsible for anti-gonadotropin action. Antagonists of dopamine such as primozide and domperidone have been used in induced breeding of fish.

3. Somatotopin is a growth hormone.
a) True
b) False
View Answer

Answer: a
Explanation: Somatotropin is a growth hormone that boosts the growth by increasing appetite and improving feed conversion efficiency of the fish. The entire hormone is used for this function.

4. Human chorionic gonadotropin (HCG) is dissolved in ___________________ for application.
a) distilled water
b) phosphate buffered saline
c) sodium benzoate
d) phenol
View Answer

Answer: a
Explanation: Human chorionic gonadotropin (HCG) is a glycoprotein hormone containing two peptide chains. It is dissolved in distilled for administration through intra peritoneal or intramuscular route.

5. GnRH is prepared in combination with __________________ for aquaculture administration.
a) dopamine
b) dopamine-antagonist
c) luteinizing hormone
d) sulfur bacteria
View Answer

Answer: a
Explanation: Dopamine has a function of gonadotropin suppression, its antagonist is therefore used in combination with gonadotropin releasing hormone (GnRH) for induced breeding of fish in captivity.

6. Which hormone stimulates the gonads and induces ovulation and spawning in mature fish?
a) Somatotropin
b) GnRH
c) HCG
d) Methyltestosterone
View Answer

Answer: c
Explanation: Human chorionic gonadotropin (HCG) or chorionic gonadotropin (CG) stimulates the gonads and induces ovulation, spawning in sexually mature fish. The recommended dose is 100-500 I.U/ B. Wt.

7. At high doses Methyltestosterone induces ____________________ in administered fish.
a) sterility
b) ovulation
c) increased size
d) increased muscle mass
View Answer

Answer: a
Explanation: 17α-Methyltestosterone is a hormone that aids in different processes depending upon the dosage administered. At high doses of 100-1000 ppm it destroys the gonadotropin and induces sterility in fish.

8. Administration of 25-100 ppm of 17α-Methyltestosterone results in ______________
a) all-male seeds
b) all-female seeds
c) sterile seeds
d) pathogen resistant seeds
View Answer

Answer: a
Explanation: Administration through feed of 25-100 ppm of 17α-Methyltestosterone results in all-male seeds while a higher dose of 100-1000 ppm results in sterile fish seeds. The hormone is 90% metabolized within 24 hours.

9. 17α-Methyltestosterone is photo-sensitive.
a) True
b) False
View Answer

Answer: a
Explanation: The hormone 17α-Methyltestosterone has a shelf life of 90 days after incorporation into feed. Since it is photo-sensitive direct exposure to sunlight must be avoided. The target organisms are fish and shellfish.

10. 17α-methyldihydrotestosterone causes ___________________ toxicity in fish.
a) renal
b) intestine
c) pancreatic
d) hepatic
View Answer

Answer: d
Explanation: 17α-methyldihydrotestosterone (MDT) and 17α-methyltestosterone (MT) are used for the same purpose i.e. production of all-male seeds. Both the hormones are reported to cause liver (hepatic) toxicity in fish.

11. Choose the odd one.
a) 17β-Oestradiol
b) 17α-Ethynyltestosterone
c) 17α-Methyldihydrotestosterone
d) 17α-Methyltestosterone
View Answer

Answer: a
Explanation: 17β-Oestradiol is a hormone administered to produce all-female seeds while the hormones 17α-Ethynyltestosterone, 17α-Methyldihydrotestosterone, 17α-Methyltestosterone are testosterone analogs used to produce all-male fish.

12. The functional component of 17β-Oestradiol is _____________________
a) nucleus
b) whole hormone
c) aromatic ring A
d) aromatic ring B
View Answer

Answer: c
Explanation: 17β-Oestradiol is a hormone used to stimulate the undifferentiated gonad to differentiate itself into ovaries. The functional component aromatic ring A is incorporated into feed for administration.

13. Diethylstilbesterol is used to induce _________________ in fish.
a) gametogenesis
b) testis formation
c) growth
d) ovary formation
View Answer

Answer: c
Explanation: Diethylstilbesterol is a hormone administered in small doses 1-5 ppm through feed. It induces growth in fish and shellfish; care must be taken while administration because the hormone is photo-sensitive.

14. Choose the correct important aquaculture species for tropical coastal nations.

1. Penaeus monodon i. Pacific white shrimp
2. Litopenaeus vannamei ii. Black tiger shrimp
3. Macrobrachium rosenbergii iii. Giant river prawn

a) 1-ii 2-i 3-iii
b) 1-i 2-ii 3-iii
c) 1-iii 2-ii 3-i
d) 1-i 2-iii 3-iii
View Answer

Answer: a
Explanation: Pacific white shrimp Litopenaeus vannamei, black tiger shrimp Penaeus monodon, and giant freshwater prawn Macrobrachium rosenbergii are important aquaculture species an foreign exchange earner for tropical coastal nations.

15. Which shrimp virus propagated from international trade in America to Asia?
a) White spot syndrome virus
b) Taura syndrome virus
c) Yellow head virus
View Answer

Answer: b
Explanation: White spot syndrome virus (WSSV) and Taura syndrome virus (TSV) are among the most lethal pathogens affection shrimp culture worldwide. WSSV moved from Asia to Americas while TSV moved in the opposite direction, through international trade.

Sanfoundry Global Education & Learning Series – Marine Biotechnology.

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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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