FAA legal framework: FAA regulations prohibit hazardous dropping — dropping objects that could endanger people or property. Dropping non-hazardous items in controlled conditions (fishing bait over open water away from people) exists in a gray zone the FAA has generally not enforced against careful recreational use. Commercial dropping operations for compensation require FAA waiver under Part 107.205.
Consumer drone compatibility: the DJI Mini 4 Pro and Air 3 have no rated payload capacity and no official mounting points. Any payload clips or mounts attached to the drone body are not supported by DJI, and payload-related damage is not covered under warranty or DJI Care Refresh.
Fishing bait release systems: servo-based magnetic release clips from brands like Gannet attach to the drone's landing gear or body via adhesive mounts ($30-80). A small servo releases a magnetic clip holding the bait line when triggered. Weight impact is significant — even 50-100g on a 249g Mini 4 Pro is a large percentage of its own weight and pushes it above 250g, eliminating the sub-250g regulatory advantage.
Better option for fishing: purpose-built fishing drones (Gannet X, SwellPro Splash 3) have rated payload capacity, waterproofing, and integrated release systems engineered for reliable bait deployment.
Check Drone Payload Release Systems on Amazon