One way is to build a large, cone-shaped funnel 4- to 6-feet long; and place it in running water, preferably with a blockade around it to direct the fish into the trap. The pressure of the moving water tends to keep the aquatic creatures packed down in the bottom of the trap, but you need to be right there to lift the trap from the water and retrieve the fish, eels, or crustaceans. The other way to make a funnel trap is to have an insert in the trap that allows the fish to go into a container, but prevents them from coming out. This is the style we will work on today.
How Does The Still-Water Fish Trap Work?**
Crab pots, lobster traps, and fish funnels all work the same way. Most aquatic animals will always keep to the edges of a trap, not thinking to go to the inside center of the trap to find the only opening. Octopi are about the only creature with the smarts to outwit a funnel trap--pretty much everything else gets trapped inside.