I hunt, and I fish, so I'm hardly against both of those activities - however, it all depends on the animal(s) that you're hunting, and the way in which you're hunting them.
I fish as a hobby, though I dislike the idea of fishing to kill. I much prefer recording the sizes of the fish and proceeding to release them - I'm a very hands-on person, so releasing a fish is almost as fun as reeling it in. Eating the animal gives me no pleasure, especially since I don't particularly enjoy fish.
However, I'm against over-fishing and fishing for rare species (particularly if the goal is to eat them) but then again, who wouldn't be? Usually, I'd place it under natural selection/survival of the fittest, but there are too many humans in the world to include them in this. The way humans mass-hunt animals, fish in particular, is also unfair. There is little skill involved with catching fish in colossal net.
Now, I'll move on to hunting. I, myself, have never hunted with a gun or a bow, but I have hunted with birds of prey (falconry). It's a far fairer, and more natural, way to hunt an animal - when you use a gun, it's impossible for the target to avoid it. Of course, it takes skill to precisely aim a gun at an animal, but it seriously is a weapon too deadly for any creature to take on. Using a bow is a more difficult method, but it's fairer on the animal since it takes more skill to use it, even if it doesn't give such a quick death.
I find hunting with falcons to be more entertaining as well. You get to see a predator in action, and they also benefit from hunting with you. It's a win-win situation, and the sides are even. If the prey is too skilled and the bird loses it, then the prey is rewarded with keeping it's life and is able to pass on those superior genes to the next generation. But, if the bird is better than it's prey, then that inferior animal doesn't get the chance to carry on it's lineage.
Anyway, that's my opinion put. I don't think there's anything wrong with hunting or fishing if it's done within limits - I am highly against over-exploitation and unfair methods of hunting, it screws the system and leads to produce weaker, more vulnerable animals. Humans, unlike a lot of predators (wolves, for example), do not bother to observe their potential prey and will, with the power of guns, shoot any animal that happens to run within the weapon's range, and that animal could have been the strongest of the herd.
People are too ignorant.