Our fishing boat has 120 volt DC power supply. We have big fish on line, a tuna, swordfish, or shark. We need to land onto boat. One hundred pounds of thrashing fish can be a handful.
First,we throw ground wire with plate into the water. We have short insulated wire going from hook up fishing line. We connect wire from lamp to insulated hook wire. Flip switch a few times if needed to stun catch with our hook to plate in water circuit. I use lamp for one amp current but you will have to find out how much zap for your fish to calm them for boarding.