Cylinder Trap
The cylinder trap is the most popular when it comes to trapping underwater creatures. Its is made up of two wire-framed cylinder halves connected at the center where you detach to retrieve your trapped minnow. Each cylinder half has a cone-shaped entry portal facing toward the center of the trap. This allows the fish to swim freely in but not find their way back out. Cylinder traps are very successful, though they are usually bulky, which might not work for shallow water trapping.
Box Trap
The box trap is fashioned around the same idea as the cylinder trap but can work better for shallow water trapping. Square rather than round, a box trap can have the same amount of volume as a cylinder trap and require only inches of water. This is seen in box traps that are 3inches tall but 24 inches wide. Box traps usually have wider mouths (openings on either end) that allow more room for fish to swim back out of the trap, which may result in fewer trapped fish.
Bottle Trap
Although there are some professionally made bottle traps, most are homemade improvisations. A bottle trap is simply an old plastic water bottle with the neck and mouth inverted into the bottle. It resembles a cylinder trap as the neck of the bottle turns nicely into a funnel that acts as a trap. Bottle traps need holes bored into the bottom and sides so that water can pass through easily.
Glass Bottle Trap
Glass bottle traps are the most classy of minnow traps. They are just as effective and have a touch of antiquity to them. These glass traps are heated with blowtorches and then poked with a conical-shaped prod that creates perfect funnels in the bottle after the glass has cooled. The bottle caps are left on, with holes poked through so that water may pass through freely.