The causes of deterioration and breakup of fishing nets are contact with fish, algae, and stones in the sea and on beaches, as well as ultraviolet radiation from the sun. An example of a way to prevent this kind of naturally occurring damage and continue using fishing nets over a long period of time is to give the surface of fishing nets used for aquaculture a protective coating of copper as shown in Fig. 2 (1). Fig. 2 Fishing Net Used for Aquaculture The heavy element copper (Cu) used for the protective coating has an antibacterial effect and not only protects against bacteria and viruses but also has the function of preventing fouling, so it plays an important role on fishing nets. Copper not only maintains the strength of the fishing nets, but also gives excellent functionality. However, in recent years it has been reported that it might have a negative impact on fish and the marine environment, and its use has been a concern. This article introduces an example of analysis using FTIR and EDX on actual fishing nets collected on the Playa de Muro beach on the Spanish island of Majorca and the Paal 9 beach on the island of Texel in the Netherlands, and on fishing nets obtained from a recycling plant.