MPA Patrol & Poaching Interdiction Simulator (2D)

Marine Protected Areas only work if their no-take rules actually hold, and holding them is a detection problem as much as a biology problem. This top-down 2D simulator renders a Marine Protected Area as a patrolled no-take disc while poacher boats attempt incursions from outside the boundary. Detection is modeled as a real Poisson process driven by patrol density and AIS/satellite sensor coverage — raise either one and undetected poachers get rarer, exactly as it works for actual fisheries enforcement. Fish biomass inside the reserve grows logistically and is drained only by catch that slips past patrols, while a diffusion term carries surplus biomass across the boundary into the adjacent fished zone, reproducing the "spillover" benefit that is the strongest empirical argument for no-take MPAs. Switch between perimeter-sweep and random-patrol strategies, dial in poaching pressure, drag and zoom the chart, and watch interception rate, in-reserve and spillover biomass, and cumulative illegal catch respond live.