hey adrian i use a 5 gallon bucket with a battery operated pump which can also be hooked up to my battery. If you really wanna get into it, you should have two batteries in your boat as using the bilge pumps to keep em alive drains the power pretty quick, from my observation of my brothers setup. Gets to the stage he has to start his motor and either go for a run or idle the motor for a while to continue the fishing. I've fished alongside of him and had no problems keeping the fish alive or lost my battery power, in fact its his old pump i have, so i dont know why he went the other way
cheers
joe.