I think spears are a good idea in some situations. For fishing in a survival situation, it's pretty easy and it keeps you busy. Trot lines are ok if you happen to have a boat you can use to check them but the easiest way is to use a throw line tied to a branch. Doesn't require you to be there, doesn't require making anything, and if you have line and hooks, you can make as many as you want. The down side to them is unless you can get a really good spot, you may only catch Moby Minnow.As far as hunting with a spear goes, you're really not likely to get close enough to anything to get a good toss at it. if you happen to snare something, a spear is definitely the way to go. Although if you can make a snare in the first place, you may as well make a deadfall and do away with the messy business of stabbing something repeatedly until it finally bleeds out leaving a big mess. Plus the animal doesn't get that adrenaline rush and foul the meat. You can still eat it, it just has a really gamey taste.