Fishing spiders, raft spiders, dock spiders,
like water striders, are covered in billions of tiny water proof hairs, and can run/walk on top of water, they can also climb underwater and are covered in a thin film of bubbled air trapped in the hairs, they can breath this bubble and stay underwater for a really long time. They mostly eat insects but will eat any thing they can catch, including small fish!!! They can also use really sensitive hairs to pick up tiny vibrations on the water that they use like echo location!!!:)