Traps are passive fishing gear that allow fish to enter but make it difficult for them to escape. Traps come in various designs, including pots (movable enclosed traps), traps that form barriers, hiding place traps, tubular traps, traps that close once entered, and open traps with mechanisms to prevent escape. Traps work by allowing fish that enter to find it difficult to exit, giving fishermen time to collect the caught fish. An advantage is some control over species and sizes caught depending on the trap type.