Although cave fishers have many superficial similarities to crabs, they do not fare well in water and aren't very good swimmers. Nevertheless, many cave fishers lair upon ledges overlooking swift-flowing subterranean rivers, giving them a relatively steady stream of food, especially in cases where such rivers are used as trade routes. Those who ply these rivers frequently travel with a few spare slaves or some unwanted livestock, and when they approach a known cave fisher haunt, they send down the unfortunate animal or slave on a raft to distract the monster's hunger.