Protandrous hermaphroditism is a sequential hermaphroditic strategy in which individuals mature initially as functional males and subsequently invert into functional females as they grow larger and older. The Asian Seabass or Barramundi (Lates calcarifer) is a classic protandrous hermaphrodite; individuals mature as males at $2$ to $4\text{ years}$ ($\lt 70\text{ cm}$) and transition into females at $6$ to $8\text{ years}$ ($\gt 70\text{ cm}$).

Option analysis:

• Tilapia: Gonochoristic with genetic/environmental sex determination.
• Asian Seabass: Correct, prototypical protandrous hermaphrodite.
• Catla: Strictly gonochoristic carps with fixed sexes.
• Cobia: Gonochoristic marine pelagic teleost.

Aquafeed extrusion cooking is classified as a High-Temperature Short-Time (HTST) process that fundamentally requires: high temperature ($100^\circ\text{C}$ to $150^\circ\text{C}$ inside the barrel), high pressure ($30$ to $40\text{ atmospheres}$), and high moisture ($20\%$ to $30\%$ added water/steam during preconditioning and extrusion) to achieve complete starch gelatinization and pellet expansion. Therefore, statement (A) only is correct.

Option analysis:

• only: Correct, high temperature, high pressure, and high moisture are essential parameters.
• and (B) only: (B) is false because low temperature fails to cook or expand feed.
• and (C) only: Incorrect.
• and (D) only: Incorrect.

Protogyny is sequential hermaphroditism where individuals function initially as females and later change sex to become functional males. Groupers (family Serranidae, genus Epinephelus) are prototypical protogynous hermaphrodites: young sexually mature fish are all females, and as the largest, dominant individuals age, their ovaries degenerate and proliferate into functional testes, transforming them into territorial breeding males.

Option analysis:

• Barramundi: Protandrous hermaphrodite (matures as male first, transforms into female).
• Tilapia: Gonochoristic.
• Grouper: Correct, classic protogynous marine teleost (female first, then male).
• Pompano: Gonochoristic carangid teleost.

Adult males of the giant freshwater prawn (Macrobrachium rosenbergii) exhibit pronounced social hierarchy with three distinct morphotypes:

• Small Male (SM): Smallest, translucent body, short non-spiny claws, actively sneaks copulations.
• Orange Claw (OC): Intermediate size with golden-orange cheliped claws, rapidly growing.
• Blue Claw (BC): Dominant, largest terminal morphotype with massive blue spiny chelipeds that defends territories and harems of females.
  
  Option analysis:
• Two: Incomplete count.
• One: Incomplete count.
• Six: Incorrect.
• Three: Correct, SM, OC, and BC morphotypes.