Personally I just use my fingers to break the gill latch, let them bleed out and pop em between a couple of wet sacks. seems to work fine.
Birdlings those f**kers in the nissan need to have that electric kontiki shoved somewhere highly unpleasant! Probably had 20 hooks on and got 20 doggies. I reckon 5 hooks should be the limit on long lines and kontikis. and if ya don’t want it put it back!!