Question

Gonadal maturation of tiger shrimp can be enhanced by removal of

• A. Telson
• B. Eye stalk
• C. Pituitary gland
• D. Pancreas

Hint:

Crustacean Maturation Endocrinology: Eyestalk Ablation removes the X-Organ/Sinus Gland $\rightarrow$ Drops Gonad Inhibiting Hormone (GIH) $\rightarrow$ Triggers rapid ovarian maturation and spawning.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Crustacean neuroendocrinology: unilateral eyestalk ablation removes the X-organ/Sinus gland complex, eliminating Gonad Inhibiting Hormone (GIH VIH) to accelerate vitellogenesis and ovarian maturation.
Key Formula or Approach:
\[ \text{Eyestalk Ablation} \implies \text{Removes X-Organ / Sinus Gland Complex} \implies \downarrow \text{GIH (Gonad Inhibiting Hormone)} \implies \uparrow \text{Vitellogenesis \& Spawning} \]

Step 2: Detailed Explanation:
In penaeid shrimp hatchery technology and reproductive neuroendocrinology:
- In female Tiger Shrimp (Penaeus monodon), the neurohemal X-Organ Sinus Gland complex located inside the optic eyestalk continuously secretes Gonad Inhibiting Hormone (GIH Vitellogenesis Inhibiting Hormone VIH), which holds the ovary in an immature, non-vitellogenic state in captivity.
- Surgical Unilateral Eyestalk Ablation (electrocautery, enucleation, or pinching of one eyestalk) eliminates the primary source of GIH.
- This releases the ovary from endocrine inhibition, stimulating the mandibular organ and Y-organ to produce methyl farnesoate and ecdysteroids, thereby accelerating rapid gonadal maturation and frequent spawning in captive broodstock.

Step 3: Final Answer:
Thus, gonadal maturation is enhanced by removal of Eye stalk, corresponding to option (B).