Statement: Along the Andhra coast, mass shrimp mortality has been reported in ponds due to a suspected virus. Courses of Action: I. Immediately test/treat affected pond water to identify the virus and parameters. II. Temporarily stop catching and selling shrimps from affected ponds. III. Advise fishermen to watch for early warning signs and report promptly.

Introduction / Context:
Aquaculture is highly sensitive to pathogens; early containment prevents spread across farms and markets. The statement indicates a likely viral agent causing mass die-offs, warranting immediate biosecurity steps.

Given Data / Assumptions:

• Multiple ponds, same coastline, mortality spike.
• Etiology likely viral; confirmation pending.

Concept / Approach:
Laboratory diagnostics (I) guide response (quarantine, pond drying, liming, chlorination, stocking rest). Halting catches (II) from affected ponds blocks contaminated stock movement and reduces consumer risk. Vigilance advisories (III) empower early detection—aberrant swimming, color change, feed refusal—triggering rapid containment.

Step-by-Step Solution:
1) Collect samples; run PCR/bacterial panels; assess DO, ammonia, nitrite (I).2) Enforce pond-level quarantine; destroy carcasses safely; halt sales from affected ponds (II).3) Issue advisories, set up hotline; monitor neighboring ponds (III).

Verification / Alternative check:
Standard biosecurity recommends test–contain–communicate triad to limit aquaculture epizootics.

Why Other Options Are Wrong:
Partial actions leave gaps; “Only” answers ignore the multi-pronged need.

Common Pitfalls:
Harvesting stressed stock for quick sale; improper carcass disposal; restarting too early.

Final Answer:
All follow.