Gillnets are a type of fishing gear made of netting that hangs vertically in the water column. They are designed to catch fish by entangling them in the mesh, which is usually made of nylon or other synthetic materials. The mesh size varies, allowing fishermen to target specific species based on their size. Gillnets can be set in various locations, including oceans, rivers, and lakes. These nets can be stationary or drift with the current, depending on the fishing method used. While effective for catching fish, gillnets can also unintentionally capture non-target species, leading to concerns about bycatch and environmental impact. Proper management and regulations are essential to minimize these effects and ensure sustainable fishing practices.