The present study was aimed at synthesis of chitosan and melanin compounds in the body of aquatic creatures and examining their capacity as antifouling, environmentally friendly and affordable. For this purpose, melanin nanoparticles were extracted from the ink of squid fish (S. Pharaonis) and chitosan nanoparticles were extracted from the shrimp shell (P. Merguiensis) and the synthesis of chitosan-melanin nanoparticles were performed under reflux conditions. Hybrid nanoparticles are characterized by FT-IR, XRD, FESEM, DLS and TEM. The results of the FTIR showed that a new bond between chitosan and melanin nanoparticles was formed in the range of 1633 cm-1. In addition, the analysis of TEM and FESEM showed that nanoparticles are spherical. Following the laboratory biological measurements, including antibacterial tests, toxicity (artemia and barnacle) and anti-algae were examined. The minimum inhibitory (MIC) values of chitosan-melanin nanoparticles were for Escherichia coli and staphylococcus aureus (1.56 and 0.871). The lethal concentration (LC50) of nanoparticles tested on the algae Isochrysis galbana was 0.302 mg/ml. Chitosan-melanin hybrid nanoparticles used as coatings with different concentrations (0, 1.5, 2 and 3 % weight) on the fiberglass panel in seawater for 90 days. The best results for the panel were observed with 3 % weight of the chitosan-melanin hybrid nanoparticles, which had the lowest weight (28 grams) of biofouling. According to the results of this study, the chitosan-melanin hybrid nanoparticles have ideal inhibition and good potential for antifouling purposes.
Also, at the end of the research, in order to evaluate the management measures for biofouling in Hormozgan Province and the tendency of the target community to use biocompatible materials in the form of quantitative research, 234 questionnaires were completed by industrial and traditional fishermen and their managers. The results showed that traditional fishermen have less knowledge about