a school of fish
bait ball
bait ball
Bait Ball is the name of a large number of herrings, when they are found in large numbers for predator fish to feed on. Or so my all knowing husband says
A shoal - a large number fish swimming together
Mixed number
The group is called a "herd".
Called a flock.
A Pod.
Gathering
rooster
A herd
The number one of swimming would be Micheal Phelpes