The first fossil fish discovered was an ostracoderm. Swiss anatomist Louis Agassiz received a fossil of boned armored fish from Scotland in the 1830s. He had a hard time classifying them because they didn't look like creatures.
When did the fossil fish first appear?
There are abundant fossils of fish about 420 million years ago, but about 480 million years ago, when fish are thought to have first appeared, there are more records of ancient fossils. It is decreasing. 2018
What was the first fish ever discovered?
The first fish were primitive jawless fish (Agnasan) that emerged in the early Cambrian, but were generally rare until the rapid evolution of the Silurian and Devonian.
How long are the fish alive?
Fish have existed on Earth for more than 450 million years, while mammals have existed on Earth for only about 200 million years. More than 27,000 species of fish have been identified on Earth, with an estimated 15,000 species not yet identified.
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