Coronavirus was first discovered in a fish market. It spreads from animal to human. Why are scientists saying it comes from bats and not from fish market animals

No, it was discovered in a wet market.

This is a wet market:

Coronavirus was first discovered in a fish market. It spreads from animal to human. Why are scientists saying it comes from bats and not from fish market animals

A wet market sells all kinds of meat: fish, yes, but also other kinds of meat. They’re called “wet markets” because the floors tend to be wet with water and blood from dozens of different kinds of animals.