Fishermen's nets are tools used to catch fish and other aquatic animals. They are typically made from strong, flexible materials like nylon or cotton, which allow them to withstand the water's pressure. Nets come in various shapes and sizes, including gill nets, seine nets, and trawl nets, each designed for specific fishing methods and environments. These nets work by trapping fish as they swim into them. Some nets are set in place and left to catch fish over time, while others are actively used by fishermen, such as trawlers that drag nets through the water. Proper use and maintenance of these nets are essential for sustainable fishing practices.