• Fish culture refers to raising fish for human consumption or for economic or business activity. • Fish preservation is the process of preserving the surplus fish in the market to prevent spoilage and wastage. • Fishing is the process of taking or seizing fish using different tools or fishing gear. • Fishing methods can be classified depending on the gears used. • Basically , a net is composed of meshes • A mesh is a basic and construction consisting of 4 knots and 4 bars