n medium aquatic humanoid merfolk 

Perception +6; low-light vision

Languages Aquan, Common

Skills Athletics +5 (+7 to Swim), Medicine +4

Str +2 Dex +4 Con +1 Int +0 Wis +1 Cha +1

Items trident (2)

AC  18; Fort +6, Ref +9, Will +4

HP 19

Speed 5 feet, swim 30 feet

Melee [>] trident +7, Damage 1d8+2 piercing

Ranged [>] trident +9 (thrown 20 feet), Damage 1d8+2 piercing

Aquatic Dash [>>] The merfolk warrior swims and attacks in one of two patterns. They either Swim twice and Strike one opponent at the end of their movement, or Swim once and Strike at any point during their movement.

Bestiary, page 235.