Kype: A hooked secondary sexual elongation of the lower jaw (mandible) that develops in mature male trout and salmon (family Salmonidae) during the spawning season.
It develops in response to elevated testosterone levels and functions in territorial dominance displays and male-male fighting for spawning redds.
Correct Option: Option 1 (Trout).
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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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Q.8
Aquaculture- ICAR JRF/SRF 2024 (Q.107)
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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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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