How to Make & Use an underwater Light Trap

How to Make and Use an Underwater Light Trap

Materials Needed:

How to Make:

  1. Make the funnel for the trap by cutting out a 1- foot diameter circle from the piece of window screen and then cut the circle in half.
  2. Next, fold one of the half circles in half and sew its two straight edges together. You now have a flattened cone.
  3. Open the cone and cut off its tip to make a funnel.
  4. Put the funnel into one end of the stove pipe, and fold the lip of the funnel back over the stove pipe. Use wire, string or water-proof tape to hold the funnel in place on the stove pipe.
  5. To close the other end of the stove pipe, make a snug plug from the 1-inch thick piece of board. Fasten the jar lid to the center of the plug using 1-inch screws. The screws must be screwed in snugly so the jar will not leak.
  6. Then drill one or two 1-inch holes in the plug and cover them with screen.
  7. On the opposite face of the wooden plug, screw in an eye screw. Use three screws to hold the plug in the stove pipe as shown in the drawing, or else the plug may pull out when you retrieve the trap from the water.


How to Use:

  1. When you want to use the trap, remove the wooden plug and put in the weight and the turned-on flashlight in the jar.
  2. Replace the wooden plug and attach a long string to the eye-hook.
  3. Lower the trap gently into a pond or stream, and tie the string to some solid object on the shore.
  4. After leaving the trap in the water for several hours, retrieve it, using the string to find it. Lift the trap slowly from the water, funnel end first, letting the water drain out of the trap through the holes in the wooden plug.
  5. Remove the wooden plug to get the insects out of the trap. Do this over a large shallow cake pan to keep insects from crawling away. The trap may also have small fish in it which should be returned to the pond or stream.