• Pond Geometry for Farm Management:
• Rectangular Ponds: The most practical and suitable shape for grow-out aquaculture ponds.
• length-to-width ratio of $2:1$ to $3:1$ (e.g., $100\text{ m} \times 40\text{ m}$) facilitates efficient dragging of seine nets across the narrow width from bank to bank, provides superior aeration coverage, and minimizes dead water zones during draining.
• Correct Option: Option 3 (Rectangular).

• Aquatic Insect Pests in Aquaculture:
• Notonecta spp. (and Anisops spp.): Aquatic hemipteran bugs belonging to the family Notonectidae, commonly known as Backswimmers because they swim upside down using their long, oar-like hind legs.
• They are voracious predators of newly stocked carp hatchlings and fry in nursery ponds.
• Cybister is a predaceous diving beetle; Ranatra is a water stick insect.
• Correct Option: Option 1 (Notonecta).

Matching the items of List I with List II for History and scope of aquaculture:

The correct combination is Option 2: (A) - (II), (B) - (IV), (C) - (1), (DB) - (Ill).

Correct option: (2) (A) - (II), (B) - (IV), (C) - (1), (DB) - (Ill)

• Milestone of Induced Breeding of IMC in India:
• 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).