From publisher blurb:
The Amazing Races PDFs introduce new archetypes, feats, character traits, racial traits, and archetypes for the core, featured, and uncommon races described in the Pathfinder Roleplaying Game: Advanced Race Guide. Every PDF contains two full pages of high quality content (no fluff or filler)!
Amazing Races: Merfolk! includes new racial feats, merfolk character traits, and alternate racial traits for merfolk. In addition, this product features a new bloodline for merfolk sorcerers: the Sirensong Bloodline!