When did trilobites and fish appear?

Trilobites first appeared in the Cambrian period, around 521 million years ago, and thrived during the Paleozoic era before going extinct at the end of the Permian period, about 252 million years ago. Fish, on the other hand, emerged later in the evolutionary timeline, with the earliest jawless fish appearing around 500 million years ago during the Cambrian period, and more advanced jawed fish appearing in the Devonian period, approximately 419 to 359 million years ago.