Vitellogenin (VTG): A phospholipoglycoprotein precursor of egg yolk proteins (lipovitellin and phosvitin).
In female teleost fishes, vitellogenin is synthesized in the liver (hepatocytes) under the endocrine stimulation of ovarian $17\beta$-estradiol ($E_2$), secreted into the bloodstream, and selectively sequestered by developing oocytes via receptor-mediated endocytosis.
Correct Option: Option 3 (Liver).
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17
ICAR JRF Aquaculture 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
What is the term for the development of a fish from an egg to a miniature adult?
In teleost ontogeny, metamorphosis refers to the comprehensive structural, anatomical, and physiological transformation of a free-swimming post-larva into a juvenile that possesses the full morphological characteristics and pigmentation of a miniature adult.
Correct Option: Option 1 (Metamorphosis).
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18
ICAR JRF Aquaculture 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
The acrosome is a component of which of the following?
Acrosome: A specialized membrane-bound, cap-like organelle derived from the Golgi apparatus situated over the anterior nucleus of a mature sperm cell.
It contains hydrolytic enzymes (hyaluronidase, acrosin) that facilitate penetration through the egg investments. (Teleost spermatozoa lack an acrosome because teleost eggs possess a micropyle, but across animals the acrosome is a sperm structure).
Correct Option: Option 3 (Sperm).
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19
ICAR JRF Aquaculture 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
The number of fish seed for transportation in containers can be calculated using the following formula
N =(D-2)Xv/RxH
Where : Dis
On 10th July 1957, at the Pond Culture Division of CIFRI in Cuttack (Angul), Odisha, pioneering fisheries scientists Dr. Hiralal Chaudhuri and Dr. K.H. Alikunhi achieved India's first successful captive induced breeding using carp pituitary extract.
The first Indian Major Carp species successfully bred in this historic experiment was Mrigal (Cirrhinus mrigala), which laid the scientific foundation for modern carp hatchery seed production.
Correct Option: Option 3 (Mrigal).
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