Phylloquinone ($K_1$): Natural plant form of vitamin K.
Menaquinone ($K_2$): Bacterial synthesized form.
Menadione ($K_3$): The synthetic, provitamin form of vitamin K, widely used as a stable water-soluble feed supplement (e.g., menadione sodium bisulfite, MSB) in fish feeds to support blood coagulation and prothrombin synthesis.
Correct Option: Option 1 (Menadione).
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Vitamin C Biosynthetic Deficiency in Aquatic Animals:
Finfishes and decapod crustaceans are incapable of endogenous biosynthesis of Vitamin C (L-Ascorbic Acid).
Biochemical Basis: They lack the functional liver/kidney enzyme L-gulonolactone oxidase (GLO), which catalyzes the final terminal enzymatic step in the conversion of L-gulonolactone to L-ascorbic acid via the uronic acid pathway.
Therefore, ascorbic acid is an obligate dietary micronutrient required to prevent scoliosis, lordosis, and impaired wound healing.
Correct Option: Option 3 (Vitamin C).
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Q.14
Aquaculture- ICAR JRF/SRF 2024 (Q.66)
MCQ (Single Correct)+4−1
High PER in fish fed with higher carbohydrate is due to
$$\text{PER} = \frac{\text{Wet Weight Gain (g)}}{\text{Crude Protein Consumed (g)}}$$
When fish are fed diets containing high digestible carbohydrates, the carbohydrates exert a protein-sparing effect for basal energy.
However, excess ingested glucose is channeled into de novo lipogenesis, accumulating as excessive visceral and carcass fat deposition. This artificially increases gross weight gain and inflates the apparent PER.
Correct Option: Option 3 (High fat deposition).
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Q.15
Aquaculture- ICAR JRF/SRF 2024 (Q.69)
MCQ (Single Correct)+4−1
Which one of the following vitamins serves as a hydrogen donor in many hydroxylation reaction
Vitamin C (Ascorbic Acid): Acts as an essential biological water-soluble reducing agent and hydrogen/electron donor in metabolic hydroxylation reactions.
Specifically, it reduces oxidized active-site iron ($Fe^{3+} \to Fe^{2+}$) in prolyl-4-hydroxylase and lysyl-hydroxylase enzymes, which hydroxylate proline and lysine residues during collagen biosynthesis.
Correct Option: Option 2 (Vitamin C).
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