Mon, 01/08/2024 - 12:46 Tech Insider There are an estimated 20,000 known species of fish, but NOAA suggests there could be another 20,000 more unaccounted for.Giordano Cipriani/Getty Images Tags Science, the-conversation, Fish, Conservation, ecology, what-if, Ocean, nutrition Source A scientist explains what would happen if all the fish in the ocean disappeared