"Bridle Rigging Live Bait"
  By: www.ThaiFishingGuide.com

This way of rigging live fish for trolling is one of the simplest methods and most productive when targeting Sailfish and Marlin.
The bridle itself is a short length of monofilament line with a sliding noose in each end. Begin by tying a noose on the hook and pulling it up tight using the knot configuration shown here.
Then tie another sliding noose in the other end of the monofilament, keeping in mind that the bridle needs to be quite short, say 100 mm for towing Skipjack Tuna. Tying bridles of this short length does take a little practice.Close the loop up on your loop gauge or pen, but not so tight that you can't get it off.
Slide the loop off your loop gauge and engage your open-eye live baiting needle.
When the baitfish comes aboard, the hook is usually cut straight off to save time, and the needle is passed straight through the eye tunnel of the baitfish taking care not to damage the eyes.
Pull the second loop right through and hook it over the point of the hook. Then disengage the loop from the open-eyed needle.
The bait is placed back in the water and trolled slowly.