/diy/ - Do It Yourself

I know nothing about quadcopters
I want to buy/build one that I can use to hook onto my fishing lure and fly out 200 meters over the ocean and then drop it so that I can catch all of the crabs
it has to haul at least 250gram
what should I be looking for with something that can do this?
I think it would be really big to haul that weight, no?
also needs to be reliable, battery life is not a problem as can swap batteries often as needed
also not sure how I would do the release, do ones you buy have auxiliary outputs for adding things?