I've now started to branch out and use more than one rock per piece.
"A different language is a different vision of life"
a) A school
b) A smack
c) A shoal
(answer is at end of post)
A group of jellyfish is called a smack (can also be called a bloom, smuck, swarm, or fluther).
A school is a general name for a group of fish, and a shoal is the name for a group of bass. Here are a few others: A battery of barracudas, a cast of crabs, a swarm of eels, a glide of flying fishes, a shiver of sharks and a flotilla of swordfishes. Whew!