The USS Pisces (NCC-2515) was a Constellation-class Federation starship in service in the 24th century. (FASA RPG module: Star Trek: The Next Generation Officer's Manual)
In 2358, the Pisces began a seven year exploration mission. Linguist Bart Faulwell enlisted in Starfleet specifically so that he could be on this mission. During this period, the Pisces encountered several new species in first contact situations including one that was on its way to joining the Federation as of 2375. (SCE eBook: War Stories, Book 1)