Probabilistic Graph Neural Inference for sustainable aquaculture monitoring systems under real-time policy constraints Introduction: A Sensor Array That Taught Me to Think in Graphs About eight months ago, I started experimenting with a small network of IoT water-quality sensors deployed across a handful of fishponds in a cooperative near my city. The original plan was embarrassingly simple: collect dissolved oxygen (DO), temperature, pH, and ammonia readings, push them into a t...