I can only comment on fish, as the estimates of ocean animal life are really uncertain. Based on the best estimate, there are about 40,000 species of fish on earth (more than the combined total of all other vertebrates), and we know of 34,400 as of December 2020. So, there are still nearly 6000 fish species left to discover!
I can only comment on fish, as the estimates of ocean animal life are really uncertain. Based on the best estimate, there are about 40,000 species of fish on earth (more than the combined total of all other vertebrates), and we know of 34,400 as of December 2020. So, there are still nearly 6000 fish species left to discover!