We will show you how to make a trawl using 40$ supplies from any hardware store.
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Step 1: Supplies
You will need the following supplies :
1) A wooden plank
2) Air conditioner Duct
3) Paint Filters (1 Pack)
4) Worm gear clamp
5) 4 round head screws
6) 4 Bolts
Step 2: Drill Holes Into the Wooden Plank and the Duct
Align the duct in center on one side of the wooden plank. Mark four points (two on each side) on the wooden plank and duct to drill the holes. (Image 1 & 2) (insert dimensions)
Drill two more holes in the plank (Image 3) (insert dimensions)
Step 3: Screw in the Duct Onto the Wooden Plank
Using the screws and bolts, fix the duct on the plank
Step 4: Attach the Filter and Worm Gear Clamp
Attach the filter to the duct and lock it using the worm gear clamp
Step 5: Tie the Rope
Tie the rope on to the wooden plank
Step 6: You're Ready to Trawl!
Step 7: Process Samples
Check out how to process the samples collected.