Decision-making – Viral shrimp mortality along the Andhra coast Statement: A mass mortality of shrimps has been reported in ponds along the entire Andhra coast due to the presence of a virus. Courses of Action: I. Immediately analyse affected pond water to identify the virus characteristics. II. Temporarily stop catching shrimps from the affected ponds. III. Advise fishermen to watch for early signs of similar outbreaks and report promptly.

Introduction / Context:
Aquaculture outbreaks require rapid diagnosis, containment, and communication. The prompt asks which actions logically follow when a virus-caused mass shrimp mortality is observed along a coastline.

Given Data / Assumptions:

• Widespread shrimp deaths are linked to a virus.
• Impacted sites are coastal ponds across Andhra.
• Goal: contain, understand, and prevent further losses.

Concept / Approach:
Outbreak management rests on three pillars: laboratory confirmation and characterization, immediate biosecurity/harvest controls, and surveillance/awareness for early detection.

Step-by-Step Solution:

Verification / Alternative check:
Standard aquatic animal health protocols recommend diagnostics, movement control, and active surveillance as immediate steps during epizootics.

Why Other Options Are Wrong:

• Only I / Only I and II / Only II and III: Each omits one necessary leg of the response tripod.
• None: Contradicts obvious public-health style containment logic.

Common Pitfalls:
Confusing “treat water” with “test water”—the clear intention is laboratory identification; overlooking the role of temporary harvest suspension.

Final Answer:
All follow