Are there really 400 species in Fish Tycoon the game Can fish displayed on poster be discovered HOW?

You are likely thinking of the classic game "Fish Tycoon", which was released in 2004. While the game features a wide variety of fish, it does not have 400 species.

The number of fish species in Fish Tycoon is much lower than that. The exact number varies depending on the version and expansions, but it's typically in the range of 50-100 species, not 400.

As for the fish displayed on posters, those are not discoverable. They are simply decorative elements in the game. The fish you can breed and sell are determined by the starting species and the combinations you create through breeding.