Ride the ship from Booty Bay to Ratchet, then speak with Gazlowe.
Say, you haven't seen a fish about this long? Short fins? Responds to the name Steve? He's blue?
Never mind, I'll keep looking.
Actually... there was another reason I came here to Booty Bay. Boss Krog, over in Dustwallow, is looking for new blood. Someone to help us Stonemaul from getting overrun. You look strong enough.
Wait on the edge of the pier for the next ship, then ride to Ratchet. Gazlowe should be able to help you from there.