look at all those answers fatman! even a great story from spago (
turdus turdus, hahaha). You'll find all the answers here. Post some picture of your area and catches, it sounds amazing.
most spearos on DB are "softies" like me and like to get the killing job done ASAP. The Ike Spike was invented in Japan I think, it is instant and easy, and mentioned above in various forms. Here is my diy version
http://forums.deeperblue.net/diy-hom...ger-combo.html
It's easy to know when it works because the fishes mouth will suddenly drop open, although some fish are really hard to kill!
Good luck