Edge-to-Cloud Swarm Coordination for sustainable aquaculture monitoring systems under real-time policy constraints Introduction: A Spark from a Shrimp Tank It started, as many of my most illuminating research rabbit holes do, with a failure. I was experimenting with a small swarm of Raspberry Pi-based sensor nodes for a friend's indoor shrimp farm. The idea was simple: each node would monitor temperature, pH, and dissolved oxygen, then report back to a central cloud server for analysis. I had the hardware working, the MQTT topics flowing, and a dashboard that was a joy to behold. Then, disaster struck. A power flicker caused a cascade of resets. Half the swarm came back online with different clock offsets. The cloud server, receiving a flood of out-of-order, timestamp-confused data, triggered a false alarm for a catastrophic ammonia spike. My friend, alerted at 2 AM, rushed to the farm only to find everything normal. The real problem?…