Blood sports cannot be justified by reference to their role in pest control or conservation  All sorts of hunting, shooting, and fishing boil down to slaughtering other animals for pleasure. If the prey is a pest (e.g. foxes), or needs culling (e.g. hares, deer), there are always more humane ways to kill it than hunting it to the point of terror and exhaustion with a pack of hounds- e.g. killing it with a rifle shot. If the prey is being killed for food it is entirely gratuitous. In modern society people do not need to kill food for themselves but can buy it from a source where animals have been killed humanely; indeed no-one needs to eat meat at all and for moral, health, and environmental reasons they should not (see vegetarianism debate). As for fishing, again there is absolutely no need to catch or eat fish; even when anglers throw their catch back in they have first put a hook through its palate.