Many types of drones are used for fishing however one of the biggest problems with fishing drones or using drones for fishing is sinking the drone.
This can ocurr for many reasons however we find that the main problem is when the line gets snagged or when a seagull or pelican hits the line whilst the drone is on its way out with the line.
Solving this problem was easy, when using Drone throwers as fitted for the Mavic drones as can be seen in the shop attached - these types of drone fishing release systems are used for many and varied deliveries
What they does is give the user the ability to set the release to auto-release on a given setting. So as soon as a bird hits the line it simply unclips saving the drone, and if a precission drop is required simply press the button on the remote and the system releases the load on command.
It should be noted that fishing drones were designed to be load carrying, be it a life vest on a SAR (search and rescue) mission, a bait for fishing...