• Dietary Requirements for Broodstock: Reproductive success (fecundity, fertilization rate, egg hatchability, and larval survival) strongly depends on balanced broodstock nutrition:
• Vitamin E ($\alpha$-tocopherol): Potent lipid-soluble antioxidant that protects germ cell membranes against lipid peroxidation and regulates gonadal maturation.
• Proteins & Carotenoids: High-quality protein provides essential amino acids for vitellogenin (yolk protein) synthesis; carotenoids (astaxanthin) serve as antioxidant buffers and improve egg hatchability.
• Essential Fatty Acids (n-3 HUFA/PUFA): EPA, DHA, and arachidonic acid (ARA) are crucial for prostaglandin biosynthesis (mediating ovulation and spermiation) and embryonic development.
• nalysis:
• All these nutrients are essential for broodstock maturation, making Option 4 (All the above nutrients) correct.

Correct option: (4) Allthe above nutrients

• Energy-Yielding Nutrients: Energy in fish diets is supplied exclusively by the macronutrients:
• Lipids: Highest energy yield ($pprox 9.5\text{ kcal/g}$).
• Proteins: Primary energy source utilized by carnivorous fish ($pprox 5.65\text{ kcal/g}$).
• Carbohydrates: Readily metabolized by omnivorous and herbivorous fish ($pprox 4.1\text{ kcal/g}$).
• Micronutrients (Vitamins and Trace Minerals): Micronutrients do not yield metabolic energy (ATP) upon oxidation; rather, they act as enzyme cofactors, antioxidants, and structural components.
• nalysis:
• (Macro nutrients): Correct.

Correct option: (2) Macro nutrients

• Discovery and Nomenclature:
• The Polish biochemist Casimir Funk coined the term "vitamine" in 1912 (derived from vita = life + amine, as he believed the anti-beriberi factor, thiamine, was a vital amine).
• The terminal 'e' was later dropped when it was discovered that not all vitamins are organic amines.
• Aquaculture Context:
• John Halver: Widely celebrated as the "Father of Fish Nutrition", established the quantitative vitamin and amino acid requirements for salmonids.
• nalysis:
• (Casimir Funk): Correct.

Correct option: (3) Casimir Funk

• Physiological Roles of Tryptophan:
• Tryptophan is an essential aromatic amino acid and the metabolic precursor of serotonin (5-hydroxytryptamine, a neurotransmitter) and melatonin.
• It also plays a key structural role in bone and cartilage collagen development.
• Classic Deficiency Signs:
• Scoliosis and Lordosis: Severe lateral and ventral spinal curvature, along with spinal dislocation and bone mineralization defects, are hallmark symptoms observed in salmonids and carps.
• Caudal Fin Erosion: Degeneration of fin tissue due to collagen breakdown.
• Metabolic Disturbances: Disruption in lipid metabolism leading to altered and decreased carcass lipid content, accompanied by cataracts and lens opacity.
• nalysis:
• All listed symptoms occur under dietary tryptophan deficiency. Hence, Option 4 (All the statements are true) is correct.