Shoal is related to Fish in the same sense as Swarm is related to which of these?

The relation is a collective name : the creature that name gathers together. A body of fish moving as one is a shoal; a body of bees on the wing is a swarm. All three distractors travel in groups too, but each carries its own collective name — wolves make a pack, cattle a herd and sheep a flock — so none of them is what the word swarm collects.