Amazon.com description: Product Description: This manual, a title in the "FAO Fishing Manual" series, provides an explanation of general calculation principles, design procedures and test methods to enable fishing gear designers and technologists, teachers and fishermen to solve problems in design, research and fishing operations. It avoids higher mathematics and succeeds in simplifying description of complex design and testing procedures. The knowledge here imparted can help to refine existing gear methods and introduce new ones to the benefit of fisheries in developed and undeveloped countries.